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1 : : /* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
2 : : #ifndef LIBFDT_H
3 : : #define LIBFDT_H
4 : : /*
5 : : * libfdt - Flat Device Tree manipulation
6 : : * Copyright (C) 2006 David Gibson, IBM Corporation.
7 : : */
8 : :
9 : : #include "libfdt_env.h"
10 : : #include "fdt.h"
11 : :
12 : : #define FDT_FIRST_SUPPORTED_VERSION 0x02
13 : : #define FDT_LAST_SUPPORTED_VERSION 0x11
14 : :
15 : : /* Error codes: informative error codes */
16 : : #define FDT_ERR_NOTFOUND 1
17 : : /* FDT_ERR_NOTFOUND: The requested node or property does not exist */
18 : : #define FDT_ERR_EXISTS 2
19 : : /* FDT_ERR_EXISTS: Attempted to create a node or property which
20 : : * already exists */
21 : : #define FDT_ERR_NOSPACE 3
22 : : /* FDT_ERR_NOSPACE: Operation needed to expand the device
23 : : * tree, but its buffer did not have sufficient space to
24 : : * contain the expanded tree. Use fdt_open_into() to move the
25 : : * device tree to a buffer with more space. */
26 : :
27 : : /* Error codes: codes for bad parameters */
28 : : #define FDT_ERR_BADOFFSET 4
29 : : /* FDT_ERR_BADOFFSET: Function was passed a structure block
30 : : * offset which is out-of-bounds, or which points to an
31 : : * unsuitable part of the structure for the operation. */
32 : : #define FDT_ERR_BADPATH 5
33 : : /* FDT_ERR_BADPATH: Function was passed a badly formatted path
34 : : * (e.g. missing a leading / for a function which requires an
35 : : * absolute path) */
36 : : #define FDT_ERR_BADPHANDLE 6
37 : : /* FDT_ERR_BADPHANDLE: Function was passed an invalid phandle.
38 : : * This can be caused either by an invalid phandle property
39 : : * length, or the phandle value was either 0 or -1, which are
40 : : * not permitted. */
41 : : #define FDT_ERR_BADSTATE 7
42 : : /* FDT_ERR_BADSTATE: Function was passed an incomplete device
43 : : * tree created by the sequential-write functions, which is
44 : : * not sufficiently complete for the requested operation. */
45 : :
46 : : /* Error codes: codes for bad device tree blobs */
47 : : #define FDT_ERR_TRUNCATED 8
48 : : /* FDT_ERR_TRUNCATED: FDT or a sub-block is improperly
49 : : * terminated (overflows, goes outside allowed bounds, or
50 : : * isn't properly terminated). */
51 : : #define FDT_ERR_BADMAGIC 9
52 : : /* FDT_ERR_BADMAGIC: Given "device tree" appears not to be a
53 : : * device tree at all - it is missing the flattened device
54 : : * tree magic number. */
55 : : #define FDT_ERR_BADVERSION 10
56 : : /* FDT_ERR_BADVERSION: Given device tree has a version which
57 : : * can't be handled by the requested operation. For
58 : : * read-write functions, this may mean that fdt_open_into() is
59 : : * required to convert the tree to the expected version. */
60 : : #define FDT_ERR_BADSTRUCTURE 11
61 : : /* FDT_ERR_BADSTRUCTURE: Given device tree has a corrupt
62 : : * structure block or other serious error (e.g. misnested
63 : : * nodes, or subnodes preceding properties). */
64 : : #define FDT_ERR_BADLAYOUT 12
65 : : /* FDT_ERR_BADLAYOUT: For read-write functions, the given
66 : : * device tree has it's sub-blocks in an order that the
67 : : * function can't handle (memory reserve map, then structure,
68 : : * then strings). Use fdt_open_into() to reorganize the tree
69 : : * into a form suitable for the read-write operations. */
70 : :
71 : : /* "Can't happen" error indicating a bug in libfdt */
72 : : #define FDT_ERR_INTERNAL 13
73 : : /* FDT_ERR_INTERNAL: libfdt has failed an internal assertion.
74 : : * Should never be returned, if it is, it indicates a bug in
75 : : * libfdt itself. */
76 : :
77 : : /* Errors in device tree content */
78 : : #define FDT_ERR_BADNCELLS 14
79 : : /* FDT_ERR_BADNCELLS: Device tree has a #address-cells, #size-cells
80 : : * or similar property with a bad format or value */
81 : :
82 : : #define FDT_ERR_BADVALUE 15
83 : : /* FDT_ERR_BADVALUE: Device tree has a property with an unexpected
84 : : * value. For example: a property expected to contain a string list
85 : : * is not NUL-terminated within the length of its value. */
86 : :
87 : : #define FDT_ERR_BADOVERLAY 16
88 : : /* FDT_ERR_BADOVERLAY: The device tree overlay, while
89 : : * correctly structured, cannot be applied due to some
90 : : * unexpected or missing value, property or node. */
91 : :
92 : : #define FDT_ERR_NOPHANDLES 17
93 : : /* FDT_ERR_NOPHANDLES: The device tree doesn't have any
94 : : * phandle available anymore without causing an overflow */
95 : :
96 : : #define FDT_ERR_BADFLAGS 18
97 : : /* FDT_ERR_BADFLAGS: The function was passed a flags field that
98 : : * contains invalid flags or an invalid combination of flags. */
99 : :
100 : : #define FDT_ERR_MAX 18
101 : :
102 : : /* constants */
103 : : #define FDT_MAX_PHANDLE 0xfffffffe
104 : : /* Valid values for phandles range from 1 to 2^32-2. */
105 : :
106 : : /**********************************************************************/
107 : : /* Low-level functions (you probably don't need these) */
108 : : /**********************************************************************/
109 : :
110 : : #ifndef SWIG /* This function is not useful in Python */
111 : : const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int checklen);
112 : : #endif
113 : : static inline void *fdt_offset_ptr_w(void *fdt, int offset, int checklen)
114 : : {
115 : 0 : return (void *)(uintptr_t)fdt_offset_ptr(fdt, offset, checklen);
116 : : }
117 : :
118 : : uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset);
119 : :
120 : : /*
121 : : * Alignment helpers:
122 : : * These helpers access words from a device tree blob. They're
123 : : * built to work even with unaligned pointers on platforms (ike
124 : : * ARM) that don't like unaligned loads and stores
125 : : */
126 : :
127 : : static inline uint32_t fdt32_ld(const fdt32_t *p)
128 : : {
129 : : const uint8_t *bp = (const uint8_t *)p;
130 : :
131 : 253853400 : return ((uint32_t)bp[0] << 24)
132 : 126927508 : | ((uint32_t)bp[1] << 16)
133 : 126927508 : | ((uint32_t)bp[2] << 8)
134 : 126927508 : | bp[3];
135 : : }
136 : :
137 : : static inline void fdt32_st(void *property, uint32_t value)
138 : : {
139 : : uint8_t *bp = property;
140 : :
141 : : bp[0] = value >> 24;
142 : : bp[1] = (value >> 16) & 0xff;
143 : : bp[2] = (value >> 8) & 0xff;
144 : : bp[3] = value & 0xff;
145 : : }
146 : :
147 : 1616 : static inline uint64_t fdt64_ld(const fdt64_t *p)
148 : : {
149 : : const uint8_t *bp = (const uint8_t *)p;
150 : :
151 : 3232 : return ((uint64_t)bp[0] << 56)
152 : 1616 : | ((uint64_t)bp[1] << 48)
153 : 1616 : | ((uint64_t)bp[2] << 40)
154 : 1616 : | ((uint64_t)bp[3] << 32)
155 : 1616 : | ((uint64_t)bp[4] << 24)
156 : 1616 : | ((uint64_t)bp[5] << 16)
157 : 1616 : | ((uint64_t)bp[6] << 8)
158 : 1616 : | bp[7];
159 : : }
160 : :
161 : : static inline void fdt64_st(void *property, uint64_t value)
162 : : {
163 : : uint8_t *bp = property;
164 : :
165 : : bp[0] = value >> 56;
166 : : bp[1] = (value >> 48) & 0xff;
167 : : bp[2] = (value >> 40) & 0xff;
168 : : bp[3] = (value >> 32) & 0xff;
169 : : bp[4] = (value >> 24) & 0xff;
170 : : bp[5] = (value >> 16) & 0xff;
171 : : bp[6] = (value >> 8) & 0xff;
172 : : bp[7] = value & 0xff;
173 : : }
174 : :
175 : : /**********************************************************************/
176 : : /* Traversal functions */
177 : : /**********************************************************************/
178 : :
179 : : int fdt_next_node(const void *fdt, int offset, int *depth);
180 : :
181 : : /**
182 : : * fdt_first_subnode() - get offset of first direct subnode
183 : : *
184 : : * @fdt: FDT blob
185 : : * @offset: Offset of node to check
186 : : * @return offset of first subnode, or -FDT_ERR_NOTFOUND if there is none
187 : : */
188 : : int fdt_first_subnode(const void *fdt, int offset);
189 : :
190 : : /**
191 : : * fdt_next_subnode() - get offset of next direct subnode
192 : : *
193 : : * After first calling fdt_first_subnode(), call this function repeatedly to
194 : : * get direct subnodes of a parent node.
195 : : *
196 : : * @fdt: FDT blob
197 : : * @offset: Offset of previous subnode
198 : : * @return offset of next subnode, or -FDT_ERR_NOTFOUND if there are no more
199 : : * subnodes
200 : : */
201 : : int fdt_next_subnode(const void *fdt, int offset);
202 : :
203 : : /**
204 : : * fdt_for_each_subnode - iterate over all subnodes of a parent
205 : : *
206 : : * @node: child node (int, lvalue)
207 : : * @fdt: FDT blob (const void *)
208 : : * @parent: parent node (int)
209 : : *
210 : : * This is actually a wrapper around a for loop and would be used like so:
211 : : *
212 : : * fdt_for_each_subnode(node, fdt, parent) {
213 : : * Use node
214 : : * ...
215 : : * }
216 : : *
217 : : * if ((node < 0) && (node != -FDT_ERR_NOTFOUND)) {
218 : : * Error handling
219 : : * }
220 : : *
221 : : * Note that this is implemented as a macro and @node is used as
222 : : * iterator in the loop. The parent variable be constant or even a
223 : : * literal.
224 : : *
225 : : */
226 : : #define fdt_for_each_subnode(node, fdt, parent) \
227 : : for (node = fdt_first_subnode(fdt, parent); \
228 : : node >= 0; \
229 : : node = fdt_next_subnode(fdt, node))
230 : :
231 : : /**********************************************************************/
232 : : /* General functions */
233 : : /**********************************************************************/
234 : : #define fdt_get_header(fdt, field) \
235 : : (fdt32_ld(&((const struct fdt_header *)(fdt))->field))
236 : : #define fdt_magic(fdt) (fdt_get_header(fdt, magic))
237 : : #define fdt_totalsize(fdt) (fdt_get_header(fdt, totalsize))
238 : : #define fdt_off_dt_struct(fdt) (fdt_get_header(fdt, off_dt_struct))
239 : : #define fdt_off_dt_strings(fdt) (fdt_get_header(fdt, off_dt_strings))
240 : : #define fdt_off_mem_rsvmap(fdt) (fdt_get_header(fdt, off_mem_rsvmap))
241 : : #define fdt_version(fdt) (fdt_get_header(fdt, version))
242 : : #define fdt_last_comp_version(fdt) (fdt_get_header(fdt, last_comp_version))
243 : : #define fdt_boot_cpuid_phys(fdt) (fdt_get_header(fdt, boot_cpuid_phys))
244 : : #define fdt_size_dt_strings(fdt) (fdt_get_header(fdt, size_dt_strings))
245 : : #define fdt_size_dt_struct(fdt) (fdt_get_header(fdt, size_dt_struct))
246 : :
247 : : #define fdt_set_hdr_(name) \
248 : : static inline void fdt_set_##name(void *fdt, uint32_t val) \
249 : : { \
250 : : struct fdt_header *fdth = (struct fdt_header *)fdt; \
251 : : fdth->name = cpu_to_fdt32(val); \
252 : : }
253 : 0 : fdt_set_hdr_(magic);
254 : 0 : fdt_set_hdr_(totalsize);
255 : 0 : fdt_set_hdr_(off_dt_struct);
256 : 0 : fdt_set_hdr_(off_dt_strings);
257 : 0 : fdt_set_hdr_(off_mem_rsvmap);
258 : 0 : fdt_set_hdr_(version);
259 : 0 : fdt_set_hdr_(last_comp_version);
260 : 0 : fdt_set_hdr_(boot_cpuid_phys);
261 : 0 : fdt_set_hdr_(size_dt_strings);
262 : 0 : fdt_set_hdr_(size_dt_struct);
263 : : #undef fdt_set_hdr_
264 : :
265 : : /**
266 : : * fdt_header_size - return the size of the tree's header
267 : : * @fdt: pointer to a flattened device tree
268 : : */
269 : : size_t fdt_header_size_(uint32_t version);
270 : 808 : static inline size_t fdt_header_size(const void *fdt)
271 : : {
272 : 808 : return fdt_header_size_(fdt_version(fdt));
273 : : }
274 : :
275 : : /**
276 : : * fdt_check_header - sanity check a device tree header
277 : :
278 : : * @fdt: pointer to data which might be a flattened device tree
279 : : *
280 : : * fdt_check_header() checks that the given buffer contains what
281 : : * appears to be a flattened device tree, and that the header contains
282 : : * valid information (to the extent that can be determined from the
283 : : * header alone).
284 : : *
285 : : * returns:
286 : : * 0, if the buffer appears to contain a valid device tree
287 : : * -FDT_ERR_BADMAGIC,
288 : : * -FDT_ERR_BADVERSION,
289 : : * -FDT_ERR_BADSTATE,
290 : : * -FDT_ERR_TRUNCATED, standard meanings, as above
291 : : */
292 : : int fdt_check_header(const void *fdt);
293 : :
294 : : /**
295 : : * fdt_move - move a device tree around in memory
296 : : * @fdt: pointer to the device tree to move
297 : : * @buf: pointer to memory where the device is to be moved
298 : : * @bufsize: size of the memory space at buf
299 : : *
300 : : * fdt_move() relocates, if possible, the device tree blob located at
301 : : * fdt to the buffer at buf of size bufsize. The buffer may overlap
302 : : * with the existing device tree blob at fdt. Therefore,
303 : : * fdt_move(fdt, fdt, fdt_totalsize(fdt))
304 : : * should always succeed.
305 : : *
306 : : * returns:
307 : : * 0, on success
308 : : * -FDT_ERR_NOSPACE, bufsize is insufficient to contain the device tree
309 : : * -FDT_ERR_BADMAGIC,
310 : : * -FDT_ERR_BADVERSION,
311 : : * -FDT_ERR_BADSTATE, standard meanings
312 : : */
313 : : int fdt_move(const void *fdt, void *buf, int bufsize);
314 : :
315 : : /**********************************************************************/
316 : : /* Read-only functions */
317 : : /**********************************************************************/
318 : :
319 : : int fdt_check_full(const void *fdt, size_t bufsize);
320 : :
321 : : /**
322 : : * fdt_get_string - retrieve a string from the strings block of a device tree
323 : : * @fdt: pointer to the device tree blob
324 : : * @stroffset: offset of the string within the strings block (native endian)
325 : : * @lenp: optional pointer to return the string's length
326 : : *
327 : : * fdt_get_string() retrieves a pointer to a single string from the
328 : : * strings block of the device tree blob at fdt, and optionally also
329 : : * returns the string's length in *lenp.
330 : : *
331 : : * returns:
332 : : * a pointer to the string, on success
333 : : * NULL, if stroffset is out of bounds, or doesn't point to a valid string
334 : : */
335 : : const char *fdt_get_string(const void *fdt, int stroffset, int *lenp);
336 : :
337 : : /**
338 : : * fdt_string - retrieve a string from the strings block of a device tree
339 : : * @fdt: pointer to the device tree blob
340 : : * @stroffset: offset of the string within the strings block (native endian)
341 : : *
342 : : * fdt_string() retrieves a pointer to a single string from the
343 : : * strings block of the device tree blob at fdt.
344 : : *
345 : : * returns:
346 : : * a pointer to the string, on success
347 : : * NULL, if stroffset is out of bounds, or doesn't point to a valid string
348 : : */
349 : : const char *fdt_string(const void *fdt, int stroffset);
350 : :
351 : : /**
352 : : * fdt_find_max_phandle - find and return the highest phandle in a tree
353 : : * @fdt: pointer to the device tree blob
354 : : * @phandle: return location for the highest phandle value found in the tree
355 : : *
356 : : * fdt_find_max_phandle() finds the highest phandle value in the given device
357 : : * tree. The value returned in @phandle is only valid if the function returns
358 : : * success.
359 : : *
360 : : * returns:
361 : : * 0 on success or a negative error code on failure
362 : : */
363 : : int fdt_find_max_phandle(const void *fdt, uint32_t *phandle);
364 : :
365 : : /**
366 : : * fdt_get_max_phandle - retrieves the highest phandle in a tree
367 : : * @fdt: pointer to the device tree blob
368 : : *
369 : : * fdt_get_max_phandle retrieves the highest phandle in the given
370 : : * device tree. This will ignore badly formatted phandles, or phandles
371 : : * with a value of 0 or -1.
372 : : *
373 : : * This function is deprecated in favour of fdt_find_max_phandle().
374 : : *
375 : : * returns:
376 : : * the highest phandle on success
377 : : * 0, if no phandle was found in the device tree
378 : : * -1, if an error occurred
379 : : */
380 : : static inline uint32_t fdt_get_max_phandle(const void *fdt)
381 : : {
382 : : uint32_t phandle;
383 : : int err;
384 : :
385 : : err = fdt_find_max_phandle(fdt, &phandle);
386 : : if (err < 0)
387 : : return (uint32_t)-1;
388 : :
389 : : return phandle;
390 : : }
391 : :
392 : : /**
393 : : * fdt_generate_phandle - return a new, unused phandle for a device tree blob
394 : : * @fdt: pointer to the device tree blob
395 : : * @phandle: return location for the new phandle
396 : : *
397 : : * Walks the device tree blob and looks for the highest phandle value. On
398 : : * success, the new, unused phandle value (one higher than the previously
399 : : * highest phandle value in the device tree blob) will be returned in the
400 : : * @phandle parameter.
401 : : *
402 : : * Returns:
403 : : * 0 on success or a negative error-code on failure
404 : : */
405 : : int fdt_generate_phandle(const void *fdt, uint32_t *phandle);
406 : :
407 : : /**
408 : : * fdt_num_mem_rsv - retrieve the number of memory reserve map entries
409 : : * @fdt: pointer to the device tree blob
410 : : *
411 : : * Returns the number of entries in the device tree blob's memory
412 : : * reservation map. This does not include the terminating 0,0 entry
413 : : * or any other (0,0) entries reserved for expansion.
414 : : *
415 : : * returns:
416 : : * the number of entries
417 : : */
418 : : int fdt_num_mem_rsv(const void *fdt);
419 : :
420 : : /**
421 : : * fdt_get_mem_rsv - retrieve one memory reserve map entry
422 : : * @fdt: pointer to the device tree blob
423 : : * @address, @size: pointers to 64-bit variables
424 : : *
425 : : * On success, *address and *size will contain the address and size of
426 : : * the n-th reserve map entry from the device tree blob, in
427 : : * native-endian format.
428 : : *
429 : : * returns:
430 : : * 0, on success
431 : : * -FDT_ERR_BADMAGIC,
432 : : * -FDT_ERR_BADVERSION,
433 : : * -FDT_ERR_BADSTATE, standard meanings
434 : : */
435 : : int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size);
436 : :
437 : : /**
438 : : * fdt_subnode_offset_namelen - find a subnode based on substring
439 : : * @fdt: pointer to the device tree blob
440 : : * @parentoffset: structure block offset of a node
441 : : * @name: name of the subnode to locate
442 : : * @namelen: number of characters of name to consider
443 : : *
444 : : * Identical to fdt_subnode_offset(), but only examine the first
445 : : * namelen characters of name for matching the subnode name. This is
446 : : * useful for finding subnodes based on a portion of a larger string,
447 : : * such as a full path.
448 : : */
449 : : #ifndef SWIG /* Not available in Python */
450 : : int fdt_subnode_offset_namelen(const void *fdt, int parentoffset,
451 : : const char *name, int namelen);
452 : : #endif
453 : : /**
454 : : * fdt_subnode_offset - find a subnode of a given node
455 : : * @fdt: pointer to the device tree blob
456 : : * @parentoffset: structure block offset of a node
457 : : * @name: name of the subnode to locate
458 : : *
459 : : * fdt_subnode_offset() finds a subnode of the node at structure block
460 : : * offset parentoffset with the given name. name may include a unit
461 : : * address, in which case fdt_subnode_offset() will find the subnode
462 : : * with that unit address, or the unit address may be omitted, in
463 : : * which case fdt_subnode_offset() will find an arbitrary subnode
464 : : * whose name excluding unit address matches the given name.
465 : : *
466 : : * returns:
467 : : * structure block offset of the requested subnode (>=0), on success
468 : : * -FDT_ERR_NOTFOUND, if the requested subnode does not exist
469 : : * -FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE
470 : : * tag
471 : : * -FDT_ERR_BADMAGIC,
472 : : * -FDT_ERR_BADVERSION,
473 : : * -FDT_ERR_BADSTATE,
474 : : * -FDT_ERR_BADSTRUCTURE,
475 : : * -FDT_ERR_TRUNCATED, standard meanings.
476 : : */
477 : : int fdt_subnode_offset(const void *fdt, int parentoffset, const char *name);
478 : :
479 : : /**
480 : : * fdt_path_offset_namelen - find a tree node by its full path
481 : : * @fdt: pointer to the device tree blob
482 : : * @path: full path of the node to locate
483 : : * @namelen: number of characters of path to consider
484 : : *
485 : : * Identical to fdt_path_offset(), but only consider the first namelen
486 : : * characters of path as the path name.
487 : : */
488 : : #ifndef SWIG /* Not available in Python */
489 : : int fdt_path_offset_namelen(const void *fdt, const char *path, int namelen);
490 : : #endif
491 : :
492 : : /**
493 : : * fdt_path_offset - find a tree node by its full path
494 : : * @fdt: pointer to the device tree blob
495 : : * @path: full path of the node to locate
496 : : *
497 : : * fdt_path_offset() finds a node of a given path in the device tree.
498 : : * Each path component may omit the unit address portion, but the
499 : : * results of this are undefined if any such path component is
500 : : * ambiguous (that is if there are multiple nodes at the relevant
501 : : * level matching the given component, differentiated only by unit
502 : : * address).
503 : : *
504 : : * returns:
505 : : * structure block offset of the node with the requested path (>=0), on
506 : : * success
507 : : * -FDT_ERR_BADPATH, given path does not begin with '/' or is invalid
508 : : * -FDT_ERR_NOTFOUND, if the requested node does not exist
509 : : * -FDT_ERR_BADMAGIC,
510 : : * -FDT_ERR_BADVERSION,
511 : : * -FDT_ERR_BADSTATE,
512 : : * -FDT_ERR_BADSTRUCTURE,
513 : : * -FDT_ERR_TRUNCATED, standard meanings.
514 : : */
515 : : int fdt_path_offset(const void *fdt, const char *path);
516 : :
517 : : /**
518 : : * fdt_get_name - retrieve the name of a given node
519 : : * @fdt: pointer to the device tree blob
520 : : * @nodeoffset: structure block offset of the starting node
521 : : * @lenp: pointer to an integer variable (will be overwritten) or NULL
522 : : *
523 : : * fdt_get_name() retrieves the name (including unit address) of the
524 : : * device tree node at structure block offset nodeoffset. If lenp is
525 : : * non-NULL, the length of this name is also returned, in the integer
526 : : * pointed to by lenp.
527 : : *
528 : : * returns:
529 : : * pointer to the node's name, on success
530 : : * If lenp is non-NULL, *lenp contains the length of that name
531 : : * (>=0)
532 : : * NULL, on error
533 : : * if lenp is non-NULL *lenp contains an error code (<0):
534 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE
535 : : * tag
536 : : * -FDT_ERR_BADMAGIC,
537 : : * -FDT_ERR_BADVERSION,
538 : : * -FDT_ERR_BADSTATE, standard meanings
539 : : */
540 : : const char *fdt_get_name(const void *fdt, int nodeoffset, int *lenp);
541 : :
542 : : /**
543 : : * fdt_first_property_offset - find the offset of a node's first property
544 : : * @fdt: pointer to the device tree blob
545 : : * @nodeoffset: structure block offset of a node
546 : : *
547 : : * fdt_first_property_offset() finds the first property of the node at
548 : : * the given structure block offset.
549 : : *
550 : : * returns:
551 : : * structure block offset of the property (>=0), on success
552 : : * -FDT_ERR_NOTFOUND, if the requested node has no properties
553 : : * -FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_BEGIN_NODE tag
554 : : * -FDT_ERR_BADMAGIC,
555 : : * -FDT_ERR_BADVERSION,
556 : : * -FDT_ERR_BADSTATE,
557 : : * -FDT_ERR_BADSTRUCTURE,
558 : : * -FDT_ERR_TRUNCATED, standard meanings.
559 : : */
560 : : int fdt_first_property_offset(const void *fdt, int nodeoffset);
561 : :
562 : : /**
563 : : * fdt_next_property_offset - step through a node's properties
564 : : * @fdt: pointer to the device tree blob
565 : : * @offset: structure block offset of a property
566 : : *
567 : : * fdt_next_property_offset() finds the property immediately after the
568 : : * one at the given structure block offset. This will be a property
569 : : * of the same node as the given property.
570 : : *
571 : : * returns:
572 : : * structure block offset of the next property (>=0), on success
573 : : * -FDT_ERR_NOTFOUND, if the given property is the last in its node
574 : : * -FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_PROP tag
575 : : * -FDT_ERR_BADMAGIC,
576 : : * -FDT_ERR_BADVERSION,
577 : : * -FDT_ERR_BADSTATE,
578 : : * -FDT_ERR_BADSTRUCTURE,
579 : : * -FDT_ERR_TRUNCATED, standard meanings.
580 : : */
581 : : int fdt_next_property_offset(const void *fdt, int offset);
582 : :
583 : : /**
584 : : * fdt_for_each_property_offset - iterate over all properties of a node
585 : : *
586 : : * @property_offset: property offset (int, lvalue)
587 : : * @fdt: FDT blob (const void *)
588 : : * @node: node offset (int)
589 : : *
590 : : * This is actually a wrapper around a for loop and would be used like so:
591 : : *
592 : : * fdt_for_each_property_offset(property, fdt, node) {
593 : : * Use property
594 : : * ...
595 : : * }
596 : : *
597 : : * if ((property < 0) && (property != -FDT_ERR_NOTFOUND)) {
598 : : * Error handling
599 : : * }
600 : : *
601 : : * Note that this is implemented as a macro and property is used as
602 : : * iterator in the loop. The node variable can be constant or even a
603 : : * literal.
604 : : */
605 : : #define fdt_for_each_property_offset(property, fdt, node) \
606 : : for (property = fdt_first_property_offset(fdt, node); \
607 : : property >= 0; \
608 : : property = fdt_next_property_offset(fdt, property))
609 : :
610 : : /**
611 : : * fdt_get_property_by_offset - retrieve the property at a given offset
612 : : * @fdt: pointer to the device tree blob
613 : : * @offset: offset of the property to retrieve
614 : : * @lenp: pointer to an integer variable (will be overwritten) or NULL
615 : : *
616 : : * fdt_get_property_by_offset() retrieves a pointer to the
617 : : * fdt_property structure within the device tree blob at the given
618 : : * offset. If lenp is non-NULL, the length of the property value is
619 : : * also returned, in the integer pointed to by lenp.
620 : : *
621 : : * Note that this code only works on device tree versions >= 16. fdt_getprop()
622 : : * works on all versions.
623 : : *
624 : : * returns:
625 : : * pointer to the structure representing the property
626 : : * if lenp is non-NULL, *lenp contains the length of the property
627 : : * value (>=0)
628 : : * NULL, on error
629 : : * if lenp is non-NULL, *lenp contains an error code (<0):
630 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag
631 : : * -FDT_ERR_BADMAGIC,
632 : : * -FDT_ERR_BADVERSION,
633 : : * -FDT_ERR_BADSTATE,
634 : : * -FDT_ERR_BADSTRUCTURE,
635 : : * -FDT_ERR_TRUNCATED, standard meanings
636 : : */
637 : : const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
638 : : int offset,
639 : : int *lenp);
640 : :
641 : : /**
642 : : * fdt_get_property_namelen - find a property based on substring
643 : : * @fdt: pointer to the device tree blob
644 : : * @nodeoffset: offset of the node whose property to find
645 : : * @name: name of the property to find
646 : : * @namelen: number of characters of name to consider
647 : : * @lenp: pointer to an integer variable (will be overwritten) or NULL
648 : : *
649 : : * Identical to fdt_get_property(), but only examine the first namelen
650 : : * characters of name for matching the property name.
651 : : */
652 : : #ifndef SWIG /* Not available in Python */
653 : : const struct fdt_property *fdt_get_property_namelen(const void *fdt,
654 : : int nodeoffset,
655 : : const char *name,
656 : : int namelen, int *lenp);
657 : : #endif
658 : :
659 : : /**
660 : : * fdt_get_property - find a given property in a given node
661 : : * @fdt: pointer to the device tree blob
662 : : * @nodeoffset: offset of the node whose property to find
663 : : * @name: name of the property to find
664 : : * @lenp: pointer to an integer variable (will be overwritten) or NULL
665 : : *
666 : : * fdt_get_property() retrieves a pointer to the fdt_property
667 : : * structure within the device tree blob corresponding to the property
668 : : * named 'name' of the node at offset nodeoffset. If lenp is
669 : : * non-NULL, the length of the property value is also returned, in the
670 : : * integer pointed to by lenp.
671 : : *
672 : : * returns:
673 : : * pointer to the structure representing the property
674 : : * if lenp is non-NULL, *lenp contains the length of the property
675 : : * value (>=0)
676 : : * NULL, on error
677 : : * if lenp is non-NULL, *lenp contains an error code (<0):
678 : : * -FDT_ERR_NOTFOUND, node does not have named property
679 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE
680 : : * tag
681 : : * -FDT_ERR_BADMAGIC,
682 : : * -FDT_ERR_BADVERSION,
683 : : * -FDT_ERR_BADSTATE,
684 : : * -FDT_ERR_BADSTRUCTURE,
685 : : * -FDT_ERR_TRUNCATED, standard meanings
686 : : */
687 : : const struct fdt_property *fdt_get_property(const void *fdt, int nodeoffset,
688 : : const char *name, int *lenp);
689 : : static inline struct fdt_property *fdt_get_property_w(void *fdt, int nodeoffset,
690 : : const char *name,
691 : : int *lenp)
692 : : {
693 : 0 : return (struct fdt_property *)(uintptr_t)
694 : : fdt_get_property(fdt, nodeoffset, name, lenp);
695 : : }
696 : :
697 : : /**
698 : : * fdt_getprop_by_offset - retrieve the value of a property at a given offset
699 : : * @fdt: pointer to the device tree blob
700 : : * @offset: offset of the property to read
701 : : * @namep: pointer to a string variable (will be overwritten) or NULL
702 : : * @lenp: pointer to an integer variable (will be overwritten) or NULL
703 : : *
704 : : * fdt_getprop_by_offset() retrieves a pointer to the value of the
705 : : * property at structure block offset 'offset' (this will be a pointer
706 : : * to within the device blob itself, not a copy of the value). If
707 : : * lenp is non-NULL, the length of the property value is also
708 : : * returned, in the integer pointed to by lenp. If namep is non-NULL,
709 : : * the property's namne will also be returned in the char * pointed to
710 : : * by namep (this will be a pointer to within the device tree's string
711 : : * block, not a new copy of the name).
712 : : *
713 : : * returns:
714 : : * pointer to the property's value
715 : : * if lenp is non-NULL, *lenp contains the length of the property
716 : : * value (>=0)
717 : : * if namep is non-NULL *namep contiains a pointer to the property
718 : : * name.
719 : : * NULL, on error
720 : : * if lenp is non-NULL, *lenp contains an error code (<0):
721 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag
722 : : * -FDT_ERR_BADMAGIC,
723 : : * -FDT_ERR_BADVERSION,
724 : : * -FDT_ERR_BADSTATE,
725 : : * -FDT_ERR_BADSTRUCTURE,
726 : : * -FDT_ERR_TRUNCATED, standard meanings
727 : : */
728 : : #ifndef SWIG /* This function is not useful in Python */
729 : : const void *fdt_getprop_by_offset(const void *fdt, int offset,
730 : : const char **namep, int *lenp);
731 : : #endif
732 : :
733 : : /**
734 : : * fdt_getprop_namelen - get property value based on substring
735 : : * @fdt: pointer to the device tree blob
736 : : * @nodeoffset: offset of the node whose property to find
737 : : * @name: name of the property to find
738 : : * @namelen: number of characters of name to consider
739 : : * @lenp: pointer to an integer variable (will be overwritten) or NULL
740 : : *
741 : : * Identical to fdt_getprop(), but only examine the first namelen
742 : : * characters of name for matching the property name.
743 : : */
744 : : #ifndef SWIG /* Not available in Python */
745 : : const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
746 : : const char *name, int namelen, int *lenp);
747 : : static inline void *fdt_getprop_namelen_w(void *fdt, int nodeoffset,
748 : : const char *name, int namelen,
749 : : int *lenp)
750 : : {
751 : 0 : return (void *)(uintptr_t)fdt_getprop_namelen(fdt, nodeoffset, name,
752 : : namelen, lenp);
753 : : }
754 : : #endif
755 : :
756 : : /**
757 : : * fdt_getprop - retrieve the value of a given property
758 : : * @fdt: pointer to the device tree blob
759 : : * @nodeoffset: offset of the node whose property to find
760 : : * @name: name of the property to find
761 : : * @lenp: pointer to an integer variable (will be overwritten) or NULL
762 : : *
763 : : * fdt_getprop() retrieves a pointer to the value of the property
764 : : * named 'name' of the node at offset nodeoffset (this will be a
765 : : * pointer to within the device blob itself, not a copy of the value).
766 : : * If lenp is non-NULL, the length of the property value is also
767 : : * returned, in the integer pointed to by lenp.
768 : : *
769 : : * returns:
770 : : * pointer to the property's value
771 : : * if lenp is non-NULL, *lenp contains the length of the property
772 : : * value (>=0)
773 : : * NULL, on error
774 : : * if lenp is non-NULL, *lenp contains an error code (<0):
775 : : * -FDT_ERR_NOTFOUND, node does not have named property
776 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE
777 : : * tag
778 : : * -FDT_ERR_BADMAGIC,
779 : : * -FDT_ERR_BADVERSION,
780 : : * -FDT_ERR_BADSTATE,
781 : : * -FDT_ERR_BADSTRUCTURE,
782 : : * -FDT_ERR_TRUNCATED, standard meanings
783 : : */
784 : : const void *fdt_getprop(const void *fdt, int nodeoffset,
785 : : const char *name, int *lenp);
786 : : static inline void *fdt_getprop_w(void *fdt, int nodeoffset,
787 : : const char *name, int *lenp)
788 : : {
789 : : return (void *)(uintptr_t)fdt_getprop(fdt, nodeoffset, name, lenp);
790 : : }
791 : :
792 : : /**
793 : : * fdt_get_phandle - retrieve the phandle of a given node
794 : : * @fdt: pointer to the device tree blob
795 : : * @nodeoffset: structure block offset of the node
796 : : *
797 : : * fdt_get_phandle() retrieves the phandle of the device tree node at
798 : : * structure block offset nodeoffset.
799 : : *
800 : : * returns:
801 : : * the phandle of the node at nodeoffset, on success (!= 0, != -1)
802 : : * 0, if the node has no phandle, or another error occurs
803 : : */
804 : : uint32_t fdt_get_phandle(const void *fdt, int nodeoffset);
805 : :
806 : : /**
807 : : * fdt_get_alias_namelen - get alias based on substring
808 : : * @fdt: pointer to the device tree blob
809 : : * @name: name of the alias th look up
810 : : * @namelen: number of characters of name to consider
811 : : *
812 : : * Identical to fdt_get_alias(), but only examine the first namelen
813 : : * characters of name for matching the alias name.
814 : : */
815 : : #ifndef SWIG /* Not available in Python */
816 : : const char *fdt_get_alias_namelen(const void *fdt,
817 : : const char *name, int namelen);
818 : : #endif
819 : :
820 : : /**
821 : : * fdt_get_alias - retrieve the path referenced by a given alias
822 : : * @fdt: pointer to the device tree blob
823 : : * @name: name of the alias th look up
824 : : *
825 : : * fdt_get_alias() retrieves the value of a given alias. That is, the
826 : : * value of the property named 'name' in the node /aliases.
827 : : *
828 : : * returns:
829 : : * a pointer to the expansion of the alias named 'name', if it exists
830 : : * NULL, if the given alias or the /aliases node does not exist
831 : : */
832 : : const char *fdt_get_alias(const void *fdt, const char *name);
833 : :
834 : : /**
835 : : * fdt_get_path - determine the full path of a node
836 : : * @fdt: pointer to the device tree blob
837 : : * @nodeoffset: offset of the node whose path to find
838 : : * @buf: character buffer to contain the returned path (will be overwritten)
839 : : * @buflen: size of the character buffer at buf
840 : : *
841 : : * fdt_get_path() computes the full path of the node at offset
842 : : * nodeoffset, and records that path in the buffer at buf.
843 : : *
844 : : * NOTE: This function is expensive, as it must scan the device tree
845 : : * structure from the start to nodeoffset.
846 : : *
847 : : * returns:
848 : : * 0, on success
849 : : * buf contains the absolute path of the node at
850 : : * nodeoffset, as a NUL-terminated string.
851 : : * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
852 : : * -FDT_ERR_NOSPACE, the path of the given node is longer than (bufsize-1)
853 : : * characters and will not fit in the given buffer.
854 : : * -FDT_ERR_BADMAGIC,
855 : : * -FDT_ERR_BADVERSION,
856 : : * -FDT_ERR_BADSTATE,
857 : : * -FDT_ERR_BADSTRUCTURE, standard meanings
858 : : */
859 : : int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen);
860 : :
861 : : /**
862 : : * fdt_supernode_atdepth_offset - find a specific ancestor of a node
863 : : * @fdt: pointer to the device tree blob
864 : : * @nodeoffset: offset of the node whose parent to find
865 : : * @supernodedepth: depth of the ancestor to find
866 : : * @nodedepth: pointer to an integer variable (will be overwritten) or NULL
867 : : *
868 : : * fdt_supernode_atdepth_offset() finds an ancestor of the given node
869 : : * at a specific depth from the root (where the root itself has depth
870 : : * 0, its immediate subnodes depth 1 and so forth). So
871 : : * fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, NULL);
872 : : * will always return 0, the offset of the root node. If the node at
873 : : * nodeoffset has depth D, then:
874 : : * fdt_supernode_atdepth_offset(fdt, nodeoffset, D, NULL);
875 : : * will return nodeoffset itself.
876 : : *
877 : : * NOTE: This function is expensive, as it must scan the device tree
878 : : * structure from the start to nodeoffset.
879 : : *
880 : : * returns:
881 : : * structure block offset of the node at node offset's ancestor
882 : : * of depth supernodedepth (>=0), on success
883 : : * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
884 : : * -FDT_ERR_NOTFOUND, supernodedepth was greater than the depth of
885 : : * nodeoffset
886 : : * -FDT_ERR_BADMAGIC,
887 : : * -FDT_ERR_BADVERSION,
888 : : * -FDT_ERR_BADSTATE,
889 : : * -FDT_ERR_BADSTRUCTURE, standard meanings
890 : : */
891 : : int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
892 : : int supernodedepth, int *nodedepth);
893 : :
894 : : /**
895 : : * fdt_node_depth - find the depth of a given node
896 : : * @fdt: pointer to the device tree blob
897 : : * @nodeoffset: offset of the node whose parent to find
898 : : *
899 : : * fdt_node_depth() finds the depth of a given node. The root node
900 : : * has depth 0, its immediate subnodes depth 1 and so forth.
901 : : *
902 : : * NOTE: This function is expensive, as it must scan the device tree
903 : : * structure from the start to nodeoffset.
904 : : *
905 : : * returns:
906 : : * depth of the node at nodeoffset (>=0), on success
907 : : * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
908 : : * -FDT_ERR_BADMAGIC,
909 : : * -FDT_ERR_BADVERSION,
910 : : * -FDT_ERR_BADSTATE,
911 : : * -FDT_ERR_BADSTRUCTURE, standard meanings
912 : : */
913 : : int fdt_node_depth(const void *fdt, int nodeoffset);
914 : :
915 : : /**
916 : : * fdt_parent_offset - find the parent of a given node
917 : : * @fdt: pointer to the device tree blob
918 : : * @nodeoffset: offset of the node whose parent to find
919 : : *
920 : : * fdt_parent_offset() locates the parent node of a given node (that
921 : : * is, it finds the offset of the node which contains the node at
922 : : * nodeoffset as a subnode).
923 : : *
924 : : * NOTE: This function is expensive, as it must scan the device tree
925 : : * structure from the start to nodeoffset, *twice*.
926 : : *
927 : : * returns:
928 : : * structure block offset of the parent of the node at nodeoffset
929 : : * (>=0), on success
930 : : * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
931 : : * -FDT_ERR_BADMAGIC,
932 : : * -FDT_ERR_BADVERSION,
933 : : * -FDT_ERR_BADSTATE,
934 : : * -FDT_ERR_BADSTRUCTURE, standard meanings
935 : : */
936 : : int fdt_parent_offset(const void *fdt, int nodeoffset);
937 : :
938 : : /**
939 : : * fdt_node_offset_by_prop_value - find nodes with a given property value
940 : : * @fdt: pointer to the device tree blob
941 : : * @startoffset: only find nodes after this offset
942 : : * @propname: property name to check
943 : : * @propval: property value to search for
944 : : * @proplen: length of the value in propval
945 : : *
946 : : * fdt_node_offset_by_prop_value() returns the offset of the first
947 : : * node after startoffset, which has a property named propname whose
948 : : * value is of length proplen and has value equal to propval; or if
949 : : * startoffset is -1, the very first such node in the tree.
950 : : *
951 : : * To iterate through all nodes matching the criterion, the following
952 : : * idiom can be used:
953 : : * offset = fdt_node_offset_by_prop_value(fdt, -1, propname,
954 : : * propval, proplen);
955 : : * while (offset != -FDT_ERR_NOTFOUND) {
956 : : * // other code here
957 : : * offset = fdt_node_offset_by_prop_value(fdt, offset, propname,
958 : : * propval, proplen);
959 : : * }
960 : : *
961 : : * Note the -1 in the first call to the function, if 0 is used here
962 : : * instead, the function will never locate the root node, even if it
963 : : * matches the criterion.
964 : : *
965 : : * returns:
966 : : * structure block offset of the located node (>= 0, >startoffset),
967 : : * on success
968 : : * -FDT_ERR_NOTFOUND, no node matching the criterion exists in the
969 : : * tree after startoffset
970 : : * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
971 : : * -FDT_ERR_BADMAGIC,
972 : : * -FDT_ERR_BADVERSION,
973 : : * -FDT_ERR_BADSTATE,
974 : : * -FDT_ERR_BADSTRUCTURE, standard meanings
975 : : */
976 : : int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
977 : : const char *propname,
978 : : const void *propval, int proplen);
979 : :
980 : : /**
981 : : * fdt_node_offset_by_phandle - find the node with a given phandle
982 : : * @fdt: pointer to the device tree blob
983 : : * @phandle: phandle value
984 : : *
985 : : * fdt_node_offset_by_phandle() returns the offset of the node
986 : : * which has the given phandle value. If there is more than one node
987 : : * in the tree with the given phandle (an invalid tree), results are
988 : : * undefined.
989 : : *
990 : : * returns:
991 : : * structure block offset of the located node (>= 0), on success
992 : : * -FDT_ERR_NOTFOUND, no node with that phandle exists
993 : : * -FDT_ERR_BADPHANDLE, given phandle value was invalid (0 or -1)
994 : : * -FDT_ERR_BADMAGIC,
995 : : * -FDT_ERR_BADVERSION,
996 : : * -FDT_ERR_BADSTATE,
997 : : * -FDT_ERR_BADSTRUCTURE, standard meanings
998 : : */
999 : : int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle);
1000 : :
1001 : : /**
1002 : : * fdt_node_check_compatible: check a node's compatible property
1003 : : * @fdt: pointer to the device tree blob
1004 : : * @nodeoffset: offset of a tree node
1005 : : * @compatible: string to match against
1006 : : *
1007 : : *
1008 : : * fdt_node_check_compatible() returns 0 if the given node contains a
1009 : : * 'compatible' property with the given string as one of its elements,
1010 : : * it returns non-zero otherwise, or on error.
1011 : : *
1012 : : * returns:
1013 : : * 0, if the node has a 'compatible' property listing the given string
1014 : : * 1, if the node has a 'compatible' property, but it does not list
1015 : : * the given string
1016 : : * -FDT_ERR_NOTFOUND, if the given node has no 'compatible' property
1017 : : * -FDT_ERR_BADOFFSET, if nodeoffset does not refer to a BEGIN_NODE tag
1018 : : * -FDT_ERR_BADMAGIC,
1019 : : * -FDT_ERR_BADVERSION,
1020 : : * -FDT_ERR_BADSTATE,
1021 : : * -FDT_ERR_BADSTRUCTURE, standard meanings
1022 : : */
1023 : : int fdt_node_check_compatible(const void *fdt, int nodeoffset,
1024 : : const char *compatible);
1025 : :
1026 : : /**
1027 : : * fdt_node_offset_by_compatible - find nodes with a given 'compatible' value
1028 : : * @fdt: pointer to the device tree blob
1029 : : * @startoffset: only find nodes after this offset
1030 : : * @compatible: 'compatible' string to match against
1031 : : *
1032 : : * fdt_node_offset_by_compatible() returns the offset of the first
1033 : : * node after startoffset, which has a 'compatible' property which
1034 : : * lists the given compatible string; or if startoffset is -1, the
1035 : : * very first such node in the tree.
1036 : : *
1037 : : * To iterate through all nodes matching the criterion, the following
1038 : : * idiom can be used:
1039 : : * offset = fdt_node_offset_by_compatible(fdt, -1, compatible);
1040 : : * while (offset != -FDT_ERR_NOTFOUND) {
1041 : : * // other code here
1042 : : * offset = fdt_node_offset_by_compatible(fdt, offset, compatible);
1043 : : * }
1044 : : *
1045 : : * Note the -1 in the first call to the function, if 0 is used here
1046 : : * instead, the function will never locate the root node, even if it
1047 : : * matches the criterion.
1048 : : *
1049 : : * returns:
1050 : : * structure block offset of the located node (>= 0, >startoffset),
1051 : : * on success
1052 : : * -FDT_ERR_NOTFOUND, no node matching the criterion exists in the
1053 : : * tree after startoffset
1054 : : * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
1055 : : * -FDT_ERR_BADMAGIC,
1056 : : * -FDT_ERR_BADVERSION,
1057 : : * -FDT_ERR_BADSTATE,
1058 : : * -FDT_ERR_BADSTRUCTURE, standard meanings
1059 : : */
1060 : : int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
1061 : : const char *compatible);
1062 : :
1063 : : /**
1064 : : * fdt_stringlist_contains - check a string list property for a string
1065 : : * @strlist: Property containing a list of strings to check
1066 : : * @listlen: Length of property
1067 : : * @str: String to search for
1068 : : *
1069 : : * This is a utility function provided for convenience. The list contains
1070 : : * one or more strings, each terminated by \0, as is found in a device tree
1071 : : * "compatible" property.
1072 : : *
1073 : : * @return: 1 if the string is found in the list, 0 not found, or invalid list
1074 : : */
1075 : : int fdt_stringlist_contains(const char *strlist, int listlen, const char *str);
1076 : :
1077 : : /**
1078 : : * fdt_stringlist_count - count the number of strings in a string list
1079 : : * @fdt: pointer to the device tree blob
1080 : : * @nodeoffset: offset of a tree node
1081 : : * @property: name of the property containing the string list
1082 : : * @return:
1083 : : * the number of strings in the given property
1084 : : * -FDT_ERR_BADVALUE if the property value is not NUL-terminated
1085 : : * -FDT_ERR_NOTFOUND if the property does not exist
1086 : : */
1087 : : int fdt_stringlist_count(const void *fdt, int nodeoffset, const char *property);
1088 : :
1089 : : /**
1090 : : * fdt_stringlist_search - find a string in a string list and return its index
1091 : : * @fdt: pointer to the device tree blob
1092 : : * @nodeoffset: offset of a tree node
1093 : : * @property: name of the property containing the string list
1094 : : * @string: string to look up in the string list
1095 : : *
1096 : : * Note that it is possible for this function to succeed on property values
1097 : : * that are not NUL-terminated. That's because the function will stop after
1098 : : * finding the first occurrence of @string. This can for example happen with
1099 : : * small-valued cell properties, such as #address-cells, when searching for
1100 : : * the empty string.
1101 : : *
1102 : : * @return:
1103 : : * the index of the string in the list of strings
1104 : : * -FDT_ERR_BADVALUE if the property value is not NUL-terminated
1105 : : * -FDT_ERR_NOTFOUND if the property does not exist or does not contain
1106 : : * the given string
1107 : : */
1108 : : int fdt_stringlist_search(const void *fdt, int nodeoffset, const char *property,
1109 : : const char *string);
1110 : :
1111 : : /**
1112 : : * fdt_stringlist_get() - obtain the string at a given index in a string list
1113 : : * @fdt: pointer to the device tree blob
1114 : : * @nodeoffset: offset of a tree node
1115 : : * @property: name of the property containing the string list
1116 : : * @index: index of the string to return
1117 : : * @lenp: return location for the string length or an error code on failure
1118 : : *
1119 : : * Note that this will successfully extract strings from properties with
1120 : : * non-NUL-terminated values. For example on small-valued cell properties
1121 : : * this function will return the empty string.
1122 : : *
1123 : : * If non-NULL, the length of the string (on success) or a negative error-code
1124 : : * (on failure) will be stored in the integer pointer to by lenp.
1125 : : *
1126 : : * @return:
1127 : : * A pointer to the string at the given index in the string list or NULL on
1128 : : * failure. On success the length of the string will be stored in the memory
1129 : : * location pointed to by the lenp parameter, if non-NULL. On failure one of
1130 : : * the following negative error codes will be returned in the lenp parameter
1131 : : * (if non-NULL):
1132 : : * -FDT_ERR_BADVALUE if the property value is not NUL-terminated
1133 : : * -FDT_ERR_NOTFOUND if the property does not exist
1134 : : */
1135 : : const char *fdt_stringlist_get(const void *fdt, int nodeoffset,
1136 : : const char *property, int index,
1137 : : int *lenp);
1138 : :
1139 : : /**********************************************************************/
1140 : : /* Read-only functions (addressing related) */
1141 : : /**********************************************************************/
1142 : :
1143 : : /**
1144 : : * FDT_MAX_NCELLS - maximum value for #address-cells and #size-cells
1145 : : *
1146 : : * This is the maximum value for #address-cells, #size-cells and
1147 : : * similar properties that will be processed by libfdt. IEE1275
1148 : : * requires that OF implementations handle values up to 4.
1149 : : * Implementations may support larger values, but in practice higher
1150 : : * values aren't used.
1151 : : */
1152 : : #define FDT_MAX_NCELLS 4
1153 : :
1154 : : /**
1155 : : * fdt_address_cells - retrieve address size for a bus represented in the tree
1156 : : * @fdt: pointer to the device tree blob
1157 : : * @nodeoffset: offset of the node to find the address size for
1158 : : *
1159 : : * When the node has a valid #address-cells property, returns its value.
1160 : : *
1161 : : * returns:
1162 : : * 0 <= n < FDT_MAX_NCELLS, on success
1163 : : * 2, if the node has no #address-cells property
1164 : : * -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid
1165 : : * #address-cells property
1166 : : * -FDT_ERR_BADMAGIC,
1167 : : * -FDT_ERR_BADVERSION,
1168 : : * -FDT_ERR_BADSTATE,
1169 : : * -FDT_ERR_BADSTRUCTURE,
1170 : : * -FDT_ERR_TRUNCATED, standard meanings
1171 : : */
1172 : : int fdt_address_cells(const void *fdt, int nodeoffset);
1173 : :
1174 : : /**
1175 : : * fdt_size_cells - retrieve address range size for a bus represented in the
1176 : : * tree
1177 : : * @fdt: pointer to the device tree blob
1178 : : * @nodeoffset: offset of the node to find the address range size for
1179 : : *
1180 : : * When the node has a valid #size-cells property, returns its value.
1181 : : *
1182 : : * returns:
1183 : : * 0 <= n < FDT_MAX_NCELLS, on success
1184 : : * 1, if the node has no #size-cells property
1185 : : * -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid
1186 : : * #size-cells property
1187 : : * -FDT_ERR_BADMAGIC,
1188 : : * -FDT_ERR_BADVERSION,
1189 : : * -FDT_ERR_BADSTATE,
1190 : : * -FDT_ERR_BADSTRUCTURE,
1191 : : * -FDT_ERR_TRUNCATED, standard meanings
1192 : : */
1193 : : int fdt_size_cells(const void *fdt, int nodeoffset);
1194 : :
1195 : :
1196 : : /**********************************************************************/
1197 : : /* Write-in-place functions */
1198 : : /**********************************************************************/
1199 : :
1200 : : /**
1201 : : * fdt_setprop_inplace_namelen_partial - change a property's value,
1202 : : * but not its size
1203 : : * @fdt: pointer to the device tree blob
1204 : : * @nodeoffset: offset of the node whose property to change
1205 : : * @name: name of the property to change
1206 : : * @namelen: number of characters of name to consider
1207 : : * @idx: index of the property to change in the array
1208 : : * @val: pointer to data to replace the property value with
1209 : : * @len: length of the property value
1210 : : *
1211 : : * Identical to fdt_setprop_inplace(), but modifies the given property
1212 : : * starting from the given index, and using only the first characters
1213 : : * of the name. It is useful when you want to manipulate only one value of
1214 : : * an array and you have a string that doesn't end with \0.
1215 : : */
1216 : : #ifndef SWIG /* Not available in Python */
1217 : : int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
1218 : : const char *name, int namelen,
1219 : : uint32_t idx, const void *val,
1220 : : int len);
1221 : : #endif
1222 : :
1223 : : /**
1224 : : * fdt_setprop_inplace - change a property's value, but not its size
1225 : : * @fdt: pointer to the device tree blob
1226 : : * @nodeoffset: offset of the node whose property to change
1227 : : * @name: name of the property to change
1228 : : * @val: pointer to data to replace the property value with
1229 : : * @len: length of the property value
1230 : : *
1231 : : * fdt_setprop_inplace() replaces the value of a given property with
1232 : : * the data in val, of length len. This function cannot change the
1233 : : * size of a property, and so will only work if len is equal to the
1234 : : * current length of the property.
1235 : : *
1236 : : * This function will alter only the bytes in the blob which contain
1237 : : * the given property value, and will not alter or move any other part
1238 : : * of the tree.
1239 : : *
1240 : : * returns:
1241 : : * 0, on success
1242 : : * -FDT_ERR_NOSPACE, if len is not equal to the property's current length
1243 : : * -FDT_ERR_NOTFOUND, node does not have the named property
1244 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1245 : : * -FDT_ERR_BADMAGIC,
1246 : : * -FDT_ERR_BADVERSION,
1247 : : * -FDT_ERR_BADSTATE,
1248 : : * -FDT_ERR_BADSTRUCTURE,
1249 : : * -FDT_ERR_TRUNCATED, standard meanings
1250 : : */
1251 : : #ifndef SWIG /* Not available in Python */
1252 : : int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
1253 : : const void *val, int len);
1254 : : #endif
1255 : :
1256 : : /**
1257 : : * fdt_setprop_inplace_u32 - change the value of a 32-bit integer property
1258 : : * @fdt: pointer to the device tree blob
1259 : : * @nodeoffset: offset of the node whose property to change
1260 : : * @name: name of the property to change
1261 : : * @val: 32-bit integer value to replace the property with
1262 : : *
1263 : : * fdt_setprop_inplace_u32() replaces the value of a given property
1264 : : * with the 32-bit integer value in val, converting val to big-endian
1265 : : * if necessary. This function cannot change the size of a property,
1266 : : * and so will only work if the property already exists and has length
1267 : : * 4.
1268 : : *
1269 : : * This function will alter only the bytes in the blob which contain
1270 : : * the given property value, and will not alter or move any other part
1271 : : * of the tree.
1272 : : *
1273 : : * returns:
1274 : : * 0, on success
1275 : : * -FDT_ERR_NOSPACE, if the property's length is not equal to 4
1276 : : * -FDT_ERR_NOTFOUND, node does not have the named property
1277 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1278 : : * -FDT_ERR_BADMAGIC,
1279 : : * -FDT_ERR_BADVERSION,
1280 : : * -FDT_ERR_BADSTATE,
1281 : : * -FDT_ERR_BADSTRUCTURE,
1282 : : * -FDT_ERR_TRUNCATED, standard meanings
1283 : : */
1284 : : static inline int fdt_setprop_inplace_u32(void *fdt, int nodeoffset,
1285 : : const char *name, uint32_t val)
1286 : : {
1287 : : fdt32_t tmp = cpu_to_fdt32(val);
1288 : : return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp));
1289 : : }
1290 : :
1291 : : /**
1292 : : * fdt_setprop_inplace_u64 - change the value of a 64-bit integer property
1293 : : * @fdt: pointer to the device tree blob
1294 : : * @nodeoffset: offset of the node whose property to change
1295 : : * @name: name of the property to change
1296 : : * @val: 64-bit integer value to replace the property with
1297 : : *
1298 : : * fdt_setprop_inplace_u64() replaces the value of a given property
1299 : : * with the 64-bit integer value in val, converting val to big-endian
1300 : : * if necessary. This function cannot change the size of a property,
1301 : : * and so will only work if the property already exists and has length
1302 : : * 8.
1303 : : *
1304 : : * This function will alter only the bytes in the blob which contain
1305 : : * the given property value, and will not alter or move any other part
1306 : : * of the tree.
1307 : : *
1308 : : * returns:
1309 : : * 0, on success
1310 : : * -FDT_ERR_NOSPACE, if the property's length is not equal to 8
1311 : : * -FDT_ERR_NOTFOUND, node does not have the named property
1312 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1313 : : * -FDT_ERR_BADMAGIC,
1314 : : * -FDT_ERR_BADVERSION,
1315 : : * -FDT_ERR_BADSTATE,
1316 : : * -FDT_ERR_BADSTRUCTURE,
1317 : : * -FDT_ERR_TRUNCATED, standard meanings
1318 : : */
1319 : : static inline int fdt_setprop_inplace_u64(void *fdt, int nodeoffset,
1320 : : const char *name, uint64_t val)
1321 : : {
1322 : : fdt64_t tmp = cpu_to_fdt64(val);
1323 : : return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp));
1324 : : }
1325 : :
1326 : : /**
1327 : : * fdt_setprop_inplace_cell - change the value of a single-cell property
1328 : : *
1329 : : * This is an alternative name for fdt_setprop_inplace_u32()
1330 : : */
1331 : : static inline int fdt_setprop_inplace_cell(void *fdt, int nodeoffset,
1332 : : const char *name, uint32_t val)
1333 : : {
1334 : : return fdt_setprop_inplace_u32(fdt, nodeoffset, name, val);
1335 : : }
1336 : :
1337 : : /**
1338 : : * fdt_nop_property - replace a property with nop tags
1339 : : * @fdt: pointer to the device tree blob
1340 : : * @nodeoffset: offset of the node whose property to nop
1341 : : * @name: name of the property to nop
1342 : : *
1343 : : * fdt_nop_property() will replace a given property's representation
1344 : : * in the blob with FDT_NOP tags, effectively removing it from the
1345 : : * tree.
1346 : : *
1347 : : * This function will alter only the bytes in the blob which contain
1348 : : * the property, and will not alter or move any other part of the
1349 : : * tree.
1350 : : *
1351 : : * returns:
1352 : : * 0, on success
1353 : : * -FDT_ERR_NOTFOUND, node does not have the named property
1354 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1355 : : * -FDT_ERR_BADMAGIC,
1356 : : * -FDT_ERR_BADVERSION,
1357 : : * -FDT_ERR_BADSTATE,
1358 : : * -FDT_ERR_BADSTRUCTURE,
1359 : : * -FDT_ERR_TRUNCATED, standard meanings
1360 : : */
1361 : : int fdt_nop_property(void *fdt, int nodeoffset, const char *name);
1362 : :
1363 : : /**
1364 : : * fdt_nop_node - replace a node (subtree) with nop tags
1365 : : * @fdt: pointer to the device tree blob
1366 : : * @nodeoffset: offset of the node to nop
1367 : : *
1368 : : * fdt_nop_node() will replace a given node's representation in the
1369 : : * blob, including all its subnodes, if any, with FDT_NOP tags,
1370 : : * effectively removing it from the tree.
1371 : : *
1372 : : * This function will alter only the bytes in the blob which contain
1373 : : * the node and its properties and subnodes, and will not alter or
1374 : : * move any other part of the tree.
1375 : : *
1376 : : * returns:
1377 : : * 0, on success
1378 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1379 : : * -FDT_ERR_BADMAGIC,
1380 : : * -FDT_ERR_BADVERSION,
1381 : : * -FDT_ERR_BADSTATE,
1382 : : * -FDT_ERR_BADSTRUCTURE,
1383 : : * -FDT_ERR_TRUNCATED, standard meanings
1384 : : */
1385 : : int fdt_nop_node(void *fdt, int nodeoffset);
1386 : :
1387 : : /**********************************************************************/
1388 : : /* Sequential write functions */
1389 : : /**********************************************************************/
1390 : :
1391 : : /* fdt_create_with_flags flags */
1392 : : #define FDT_CREATE_FLAG_NO_NAME_DEDUP 0x1
1393 : : /* FDT_CREATE_FLAG_NO_NAME_DEDUP: Do not try to de-duplicate property
1394 : : * names in the fdt. This can result in faster creation times, but
1395 : : * a larger fdt. */
1396 : :
1397 : : #define FDT_CREATE_FLAGS_ALL (FDT_CREATE_FLAG_NO_NAME_DEDUP)
1398 : :
1399 : : /**
1400 : : * fdt_create_with_flags - begin creation of a new fdt
1401 : : * @fdt: pointer to memory allocated where fdt will be created
1402 : : * @bufsize: size of the memory space at fdt
1403 : : * @flags: a valid combination of FDT_CREATE_FLAG_ flags, or 0.
1404 : : *
1405 : : * fdt_create_with_flags() begins the process of creating a new fdt with
1406 : : * the sequential write interface.
1407 : : *
1408 : : * fdt creation process must end with fdt_finished() to produce a valid fdt.
1409 : : *
1410 : : * returns:
1411 : : * 0, on success
1412 : : * -FDT_ERR_NOSPACE, bufsize is insufficient for a minimal fdt
1413 : : * -FDT_ERR_BADFLAGS, flags is not valid
1414 : : */
1415 : : int fdt_create_with_flags(void *buf, int bufsize, uint32_t flags);
1416 : :
1417 : : /**
1418 : : * fdt_create - begin creation of a new fdt
1419 : : * @fdt: pointer to memory allocated where fdt will be created
1420 : : * @bufsize: size of the memory space at fdt
1421 : : *
1422 : : * fdt_create() is equivalent to fdt_create_with_flags() with flags=0.
1423 : : *
1424 : : * returns:
1425 : : * 0, on success
1426 : : * -FDT_ERR_NOSPACE, bufsize is insufficient for a minimal fdt
1427 : : */
1428 : : int fdt_create(void *buf, int bufsize);
1429 : :
1430 : : int fdt_resize(void *fdt, void *buf, int bufsize);
1431 : : int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size);
1432 : : int fdt_finish_reservemap(void *fdt);
1433 : : int fdt_begin_node(void *fdt, const char *name);
1434 : : int fdt_property(void *fdt, const char *name, const void *val, int len);
1435 : : static inline int fdt_property_u32(void *fdt, const char *name, uint32_t val)
1436 : : {
1437 : : fdt32_t tmp = cpu_to_fdt32(val);
1438 : : return fdt_property(fdt, name, &tmp, sizeof(tmp));
1439 : : }
1440 : : static inline int fdt_property_u64(void *fdt, const char *name, uint64_t val)
1441 : : {
1442 : : fdt64_t tmp = cpu_to_fdt64(val);
1443 : : return fdt_property(fdt, name, &tmp, sizeof(tmp));
1444 : : }
1445 : :
1446 : : #ifndef SWIG /* Not available in Python */
1447 : : static inline int fdt_property_cell(void *fdt, const char *name, uint32_t val)
1448 : : {
1449 : : return fdt_property_u32(fdt, name, val);
1450 : : }
1451 : : #endif
1452 : :
1453 : : /**
1454 : : * fdt_property_placeholder - add a new property and return a ptr to its value
1455 : : *
1456 : : * @fdt: pointer to the device tree blob
1457 : : * @name: name of property to add
1458 : : * @len: length of property value in bytes
1459 : : * @valp: returns a pointer to where where the value should be placed
1460 : : *
1461 : : * returns:
1462 : : * 0, on success
1463 : : * -FDT_ERR_BADMAGIC,
1464 : : * -FDT_ERR_NOSPACE, standard meanings
1465 : : */
1466 : : int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp);
1467 : :
1468 : : #define fdt_property_string(fdt, name, str) \
1469 : : fdt_property(fdt, name, str, strlen(str)+1)
1470 : : int fdt_end_node(void *fdt);
1471 : : int fdt_finish(void *fdt);
1472 : :
1473 : : /**********************************************************************/
1474 : : /* Read-write functions */
1475 : : /**********************************************************************/
1476 : :
1477 : : int fdt_create_empty_tree(void *buf, int bufsize);
1478 : : int fdt_open_into(const void *fdt, void *buf, int bufsize);
1479 : : int fdt_pack(void *fdt);
1480 : :
1481 : : /**
1482 : : * fdt_add_mem_rsv - add one memory reserve map entry
1483 : : * @fdt: pointer to the device tree blob
1484 : : * @address, @size: 64-bit values (native endian)
1485 : : *
1486 : : * Adds a reserve map entry to the given blob reserving a region at
1487 : : * address address of length size.
1488 : : *
1489 : : * This function will insert data into the reserve map and will
1490 : : * therefore change the indexes of some entries in the table.
1491 : : *
1492 : : * returns:
1493 : : * 0, on success
1494 : : * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1495 : : * contain the new reservation entry
1496 : : * -FDT_ERR_BADMAGIC,
1497 : : * -FDT_ERR_BADVERSION,
1498 : : * -FDT_ERR_BADSTATE,
1499 : : * -FDT_ERR_BADSTRUCTURE,
1500 : : * -FDT_ERR_BADLAYOUT,
1501 : : * -FDT_ERR_TRUNCATED, standard meanings
1502 : : */
1503 : : int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size);
1504 : :
1505 : : /**
1506 : : * fdt_del_mem_rsv - remove a memory reserve map entry
1507 : : * @fdt: pointer to the device tree blob
1508 : : * @n: entry to remove
1509 : : *
1510 : : * fdt_del_mem_rsv() removes the n-th memory reserve map entry from
1511 : : * the blob.
1512 : : *
1513 : : * This function will delete data from the reservation table and will
1514 : : * therefore change the indexes of some entries in the table.
1515 : : *
1516 : : * returns:
1517 : : * 0, on success
1518 : : * -FDT_ERR_NOTFOUND, there is no entry of the given index (i.e. there
1519 : : * are less than n+1 reserve map entries)
1520 : : * -FDT_ERR_BADMAGIC,
1521 : : * -FDT_ERR_BADVERSION,
1522 : : * -FDT_ERR_BADSTATE,
1523 : : * -FDT_ERR_BADSTRUCTURE,
1524 : : * -FDT_ERR_BADLAYOUT,
1525 : : * -FDT_ERR_TRUNCATED, standard meanings
1526 : : */
1527 : : int fdt_del_mem_rsv(void *fdt, int n);
1528 : :
1529 : : /**
1530 : : * fdt_set_name - change the name of a given node
1531 : : * @fdt: pointer to the device tree blob
1532 : : * @nodeoffset: structure block offset of a node
1533 : : * @name: name to give the node
1534 : : *
1535 : : * fdt_set_name() replaces the name (including unit address, if any)
1536 : : * of the given node with the given string. NOTE: this function can't
1537 : : * efficiently check if the new name is unique amongst the given
1538 : : * node's siblings; results are undefined if this function is invoked
1539 : : * with a name equal to one of the given node's siblings.
1540 : : *
1541 : : * This function may insert or delete data from the blob, and will
1542 : : * therefore change the offsets of some existing nodes.
1543 : : *
1544 : : * returns:
1545 : : * 0, on success
1546 : : * -FDT_ERR_NOSPACE, there is insufficient free space in the blob
1547 : : * to contain the new name
1548 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1549 : : * -FDT_ERR_BADMAGIC,
1550 : : * -FDT_ERR_BADVERSION,
1551 : : * -FDT_ERR_BADSTATE, standard meanings
1552 : : */
1553 : : int fdt_set_name(void *fdt, int nodeoffset, const char *name);
1554 : :
1555 : : /**
1556 : : * fdt_setprop - create or change a property
1557 : : * @fdt: pointer to the device tree blob
1558 : : * @nodeoffset: offset of the node whose property to change
1559 : : * @name: name of the property to change
1560 : : * @val: pointer to data to set the property value to
1561 : : * @len: length of the property value
1562 : : *
1563 : : * fdt_setprop() sets the value of the named property in the given
1564 : : * node to the given value and length, creating the property if it
1565 : : * does not already exist.
1566 : : *
1567 : : * This function may insert or delete data from the blob, and will
1568 : : * therefore change the offsets of some existing nodes.
1569 : : *
1570 : : * returns:
1571 : : * 0, on success
1572 : : * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1573 : : * contain the new property value
1574 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1575 : : * -FDT_ERR_BADLAYOUT,
1576 : : * -FDT_ERR_BADMAGIC,
1577 : : * -FDT_ERR_BADVERSION,
1578 : : * -FDT_ERR_BADSTATE,
1579 : : * -FDT_ERR_BADSTRUCTURE,
1580 : : * -FDT_ERR_BADLAYOUT,
1581 : : * -FDT_ERR_TRUNCATED, standard meanings
1582 : : */
1583 : : int fdt_setprop(void *fdt, int nodeoffset, const char *name,
1584 : : const void *val, int len);
1585 : :
1586 : : /**
1587 : : * fdt_setprop_placeholder - allocate space for a property
1588 : : * @fdt: pointer to the device tree blob
1589 : : * @nodeoffset: offset of the node whose property to change
1590 : : * @name: name of the property to change
1591 : : * @len: length of the property value
1592 : : * @prop_data: return pointer to property data
1593 : : *
1594 : : * fdt_setprop_placeholer() allocates the named property in the given node.
1595 : : * If the property exists it is resized. In either case a pointer to the
1596 : : * property data is returned.
1597 : : *
1598 : : * This function may insert or delete data from the blob, and will
1599 : : * therefore change the offsets of some existing nodes.
1600 : : *
1601 : : * returns:
1602 : : * 0, on success
1603 : : * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1604 : : * contain the new property value
1605 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1606 : : * -FDT_ERR_BADLAYOUT,
1607 : : * -FDT_ERR_BADMAGIC,
1608 : : * -FDT_ERR_BADVERSION,
1609 : : * -FDT_ERR_BADSTATE,
1610 : : * -FDT_ERR_BADSTRUCTURE,
1611 : : * -FDT_ERR_BADLAYOUT,
1612 : : * -FDT_ERR_TRUNCATED, standard meanings
1613 : : */
1614 : : int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name,
1615 : : int len, void **prop_data);
1616 : :
1617 : : /**
1618 : : * fdt_setprop_u32 - set a property to a 32-bit integer
1619 : : * @fdt: pointer to the device tree blob
1620 : : * @nodeoffset: offset of the node whose property to change
1621 : : * @name: name of the property to change
1622 : : * @val: 32-bit integer value for the property (native endian)
1623 : : *
1624 : : * fdt_setprop_u32() sets the value of the named property in the given
1625 : : * node to the given 32-bit integer value (converting to big-endian if
1626 : : * necessary), or creates a new property with that value if it does
1627 : : * not already exist.
1628 : : *
1629 : : * This function may insert or delete data from the blob, and will
1630 : : * therefore change the offsets of some existing nodes.
1631 : : *
1632 : : * returns:
1633 : : * 0, on success
1634 : : * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1635 : : * contain the new property value
1636 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1637 : : * -FDT_ERR_BADLAYOUT,
1638 : : * -FDT_ERR_BADMAGIC,
1639 : : * -FDT_ERR_BADVERSION,
1640 : : * -FDT_ERR_BADSTATE,
1641 : : * -FDT_ERR_BADSTRUCTURE,
1642 : : * -FDT_ERR_BADLAYOUT,
1643 : : * -FDT_ERR_TRUNCATED, standard meanings
1644 : : */
1645 : : static inline int fdt_setprop_u32(void *fdt, int nodeoffset, const char *name,
1646 : : uint32_t val)
1647 : : {
1648 : : fdt32_t tmp = cpu_to_fdt32(val);
1649 : : return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
1650 : : }
1651 : :
1652 : : /**
1653 : : * fdt_setprop_u64 - set a property to a 64-bit integer
1654 : : * @fdt: pointer to the device tree blob
1655 : : * @nodeoffset: offset of the node whose property to change
1656 : : * @name: name of the property to change
1657 : : * @val: 64-bit integer value for the property (native endian)
1658 : : *
1659 : : * fdt_setprop_u64() sets the value of the named property in the given
1660 : : * node to the given 64-bit integer value (converting to big-endian if
1661 : : * necessary), or creates a new property with that value if it does
1662 : : * not already exist.
1663 : : *
1664 : : * This function may insert or delete data from the blob, and will
1665 : : * therefore change the offsets of some existing nodes.
1666 : : *
1667 : : * returns:
1668 : : * 0, on success
1669 : : * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1670 : : * contain the new property value
1671 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1672 : : * -FDT_ERR_BADLAYOUT,
1673 : : * -FDT_ERR_BADMAGIC,
1674 : : * -FDT_ERR_BADVERSION,
1675 : : * -FDT_ERR_BADSTATE,
1676 : : * -FDT_ERR_BADSTRUCTURE,
1677 : : * -FDT_ERR_BADLAYOUT,
1678 : : * -FDT_ERR_TRUNCATED, standard meanings
1679 : : */
1680 : : static inline int fdt_setprop_u64(void *fdt, int nodeoffset, const char *name,
1681 : : uint64_t val)
1682 : : {
1683 : : fdt64_t tmp = cpu_to_fdt64(val);
1684 : : return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
1685 : : }
1686 : :
1687 : : /**
1688 : : * fdt_setprop_cell - set a property to a single cell value
1689 : : *
1690 : : * This is an alternative name for fdt_setprop_u32()
1691 : : */
1692 : : static inline int fdt_setprop_cell(void *fdt, int nodeoffset, const char *name,
1693 : : uint32_t val)
1694 : : {
1695 : : return fdt_setprop_u32(fdt, nodeoffset, name, val);
1696 : : }
1697 : :
1698 : : /**
1699 : : * fdt_setprop_string - set a property to a string value
1700 : : * @fdt: pointer to the device tree blob
1701 : : * @nodeoffset: offset of the node whose property to change
1702 : : * @name: name of the property to change
1703 : : * @str: string value for the property
1704 : : *
1705 : : * fdt_setprop_string() sets the value of the named property in the
1706 : : * given node to the given string value (using the length of the
1707 : : * string to determine the new length of the property), or creates a
1708 : : * new property with that value if it does not already exist.
1709 : : *
1710 : : * This function may insert or delete data from the blob, and will
1711 : : * therefore change the offsets of some existing nodes.
1712 : : *
1713 : : * returns:
1714 : : * 0, on success
1715 : : * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1716 : : * contain the new property value
1717 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1718 : : * -FDT_ERR_BADLAYOUT,
1719 : : * -FDT_ERR_BADMAGIC,
1720 : : * -FDT_ERR_BADVERSION,
1721 : : * -FDT_ERR_BADSTATE,
1722 : : * -FDT_ERR_BADSTRUCTURE,
1723 : : * -FDT_ERR_BADLAYOUT,
1724 : : * -FDT_ERR_TRUNCATED, standard meanings
1725 : : */
1726 : : #define fdt_setprop_string(fdt, nodeoffset, name, str) \
1727 : : fdt_setprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
1728 : :
1729 : :
1730 : : /**
1731 : : * fdt_setprop_empty - set a property to an empty value
1732 : : * @fdt: pointer to the device tree blob
1733 : : * @nodeoffset: offset of the node whose property to change
1734 : : * @name: name of the property to change
1735 : : *
1736 : : * fdt_setprop_empty() sets the value of the named property in the
1737 : : * given node to an empty (zero length) value, or creates a new empty
1738 : : * property if it does not already exist.
1739 : : *
1740 : : * This function may insert or delete data from the blob, and will
1741 : : * therefore change the offsets of some existing nodes.
1742 : : *
1743 : : * returns:
1744 : : * 0, on success
1745 : : * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1746 : : * contain the new property value
1747 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1748 : : * -FDT_ERR_BADLAYOUT,
1749 : : * -FDT_ERR_BADMAGIC,
1750 : : * -FDT_ERR_BADVERSION,
1751 : : * -FDT_ERR_BADSTATE,
1752 : : * -FDT_ERR_BADSTRUCTURE,
1753 : : * -FDT_ERR_BADLAYOUT,
1754 : : * -FDT_ERR_TRUNCATED, standard meanings
1755 : : */
1756 : : #define fdt_setprop_empty(fdt, nodeoffset, name) \
1757 : : fdt_setprop((fdt), (nodeoffset), (name), NULL, 0)
1758 : :
1759 : : /**
1760 : : * fdt_appendprop - append to or create a property
1761 : : * @fdt: pointer to the device tree blob
1762 : : * @nodeoffset: offset of the node whose property to change
1763 : : * @name: name of the property to append to
1764 : : * @val: pointer to data to append to the property value
1765 : : * @len: length of the data to append to the property value
1766 : : *
1767 : : * fdt_appendprop() appends the value to the named property in the
1768 : : * given node, creating the property if it does not already exist.
1769 : : *
1770 : : * This function may insert data into the blob, and will therefore
1771 : : * change the offsets of some existing nodes.
1772 : : *
1773 : : * returns:
1774 : : * 0, on success
1775 : : * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1776 : : * contain the new property value
1777 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1778 : : * -FDT_ERR_BADLAYOUT,
1779 : : * -FDT_ERR_BADMAGIC,
1780 : : * -FDT_ERR_BADVERSION,
1781 : : * -FDT_ERR_BADSTATE,
1782 : : * -FDT_ERR_BADSTRUCTURE,
1783 : : * -FDT_ERR_BADLAYOUT,
1784 : : * -FDT_ERR_TRUNCATED, standard meanings
1785 : : */
1786 : : int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
1787 : : const void *val, int len);
1788 : :
1789 : : /**
1790 : : * fdt_appendprop_u32 - append a 32-bit integer value to a property
1791 : : * @fdt: pointer to the device tree blob
1792 : : * @nodeoffset: offset of the node whose property to change
1793 : : * @name: name of the property to change
1794 : : * @val: 32-bit integer value to append to the property (native endian)
1795 : : *
1796 : : * fdt_appendprop_u32() appends the given 32-bit integer value
1797 : : * (converting to big-endian if necessary) to the value of the named
1798 : : * property in the given node, or creates a new property with that
1799 : : * value if it does not already exist.
1800 : : *
1801 : : * This function may insert data into the blob, and will therefore
1802 : : * change the offsets of some existing nodes.
1803 : : *
1804 : : * returns:
1805 : : * 0, on success
1806 : : * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1807 : : * contain the new property value
1808 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1809 : : * -FDT_ERR_BADLAYOUT,
1810 : : * -FDT_ERR_BADMAGIC,
1811 : : * -FDT_ERR_BADVERSION,
1812 : : * -FDT_ERR_BADSTATE,
1813 : : * -FDT_ERR_BADSTRUCTURE,
1814 : : * -FDT_ERR_BADLAYOUT,
1815 : : * -FDT_ERR_TRUNCATED, standard meanings
1816 : : */
1817 : : static inline int fdt_appendprop_u32(void *fdt, int nodeoffset,
1818 : : const char *name, uint32_t val)
1819 : : {
1820 : : fdt32_t tmp = cpu_to_fdt32(val);
1821 : : return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
1822 : : }
1823 : :
1824 : : /**
1825 : : * fdt_appendprop_u64 - append a 64-bit integer value to a property
1826 : : * @fdt: pointer to the device tree blob
1827 : : * @nodeoffset: offset of the node whose property to change
1828 : : * @name: name of the property to change
1829 : : * @val: 64-bit integer value to append to the property (native endian)
1830 : : *
1831 : : * fdt_appendprop_u64() appends the given 64-bit integer value
1832 : : * (converting to big-endian if necessary) to the value of the named
1833 : : * property in the given node, or creates a new property with that
1834 : : * value if it does not already exist.
1835 : : *
1836 : : * This function may insert data into the blob, and will therefore
1837 : : * change the offsets of some existing nodes.
1838 : : *
1839 : : * returns:
1840 : : * 0, on success
1841 : : * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1842 : : * contain the new property value
1843 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1844 : : * -FDT_ERR_BADLAYOUT,
1845 : : * -FDT_ERR_BADMAGIC,
1846 : : * -FDT_ERR_BADVERSION,
1847 : : * -FDT_ERR_BADSTATE,
1848 : : * -FDT_ERR_BADSTRUCTURE,
1849 : : * -FDT_ERR_BADLAYOUT,
1850 : : * -FDT_ERR_TRUNCATED, standard meanings
1851 : : */
1852 : : static inline int fdt_appendprop_u64(void *fdt, int nodeoffset,
1853 : : const char *name, uint64_t val)
1854 : : {
1855 : : fdt64_t tmp = cpu_to_fdt64(val);
1856 : : return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
1857 : : }
1858 : :
1859 : : /**
1860 : : * fdt_appendprop_cell - append a single cell value to a property
1861 : : *
1862 : : * This is an alternative name for fdt_appendprop_u32()
1863 : : */
1864 : : static inline int fdt_appendprop_cell(void *fdt, int nodeoffset,
1865 : : const char *name, uint32_t val)
1866 : : {
1867 : : return fdt_appendprop_u32(fdt, nodeoffset, name, val);
1868 : : }
1869 : :
1870 : : /**
1871 : : * fdt_appendprop_string - append a string to a property
1872 : : * @fdt: pointer to the device tree blob
1873 : : * @nodeoffset: offset of the node whose property to change
1874 : : * @name: name of the property to change
1875 : : * @str: string value to append to the property
1876 : : *
1877 : : * fdt_appendprop_string() appends the given string to the value of
1878 : : * the named property in the given node, or creates a new property
1879 : : * with that value if it does not already exist.
1880 : : *
1881 : : * This function may insert data into the blob, and will therefore
1882 : : * change the offsets of some existing nodes.
1883 : : *
1884 : : * returns:
1885 : : * 0, on success
1886 : : * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1887 : : * contain the new property value
1888 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1889 : : * -FDT_ERR_BADLAYOUT,
1890 : : * -FDT_ERR_BADMAGIC,
1891 : : * -FDT_ERR_BADVERSION,
1892 : : * -FDT_ERR_BADSTATE,
1893 : : * -FDT_ERR_BADSTRUCTURE,
1894 : : * -FDT_ERR_BADLAYOUT,
1895 : : * -FDT_ERR_TRUNCATED, standard meanings
1896 : : */
1897 : : #define fdt_appendprop_string(fdt, nodeoffset, name, str) \
1898 : : fdt_appendprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
1899 : :
1900 : : /**
1901 : : * fdt_appendprop_addrrange - append a address range property
1902 : : * @fdt: pointer to the device tree blob
1903 : : * @parent: offset of the parent node
1904 : : * @nodeoffset: offset of the node to add a property at
1905 : : * @name: name of property
1906 : : * @addr: start address of a given range
1907 : : * @size: size of a given range
1908 : : *
1909 : : * fdt_appendprop_addrrange() appends an address range value (start
1910 : : * address and size) to the value of the named property in the given
1911 : : * node, or creates a new property with that value if it does not
1912 : : * already exist.
1913 : : * If "name" is not specified, a default "reg" is used.
1914 : : * Cell sizes are determined by parent's #address-cells and #size-cells.
1915 : : *
1916 : : * This function may insert data into the blob, and will therefore
1917 : : * change the offsets of some existing nodes.
1918 : : *
1919 : : * returns:
1920 : : * 0, on success
1921 : : * -FDT_ERR_BADLAYOUT,
1922 : : * -FDT_ERR_BADMAGIC,
1923 : : * -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid
1924 : : * #address-cells property
1925 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1926 : : * -FDT_ERR_BADSTATE,
1927 : : * -FDT_ERR_BADSTRUCTURE,
1928 : : * -FDT_ERR_BADVERSION,
1929 : : * -FDT_ERR_BADVALUE, addr or size doesn't fit to respective cells size
1930 : : * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1931 : : * contain a new property
1932 : : * -FDT_ERR_TRUNCATED, standard meanings
1933 : : */
1934 : : int fdt_appendprop_addrrange(void *fdt, int parent, int nodeoffset,
1935 : : const char *name, uint64_t addr, uint64_t size);
1936 : :
1937 : : /**
1938 : : * fdt_delprop - delete a property
1939 : : * @fdt: pointer to the device tree blob
1940 : : * @nodeoffset: offset of the node whose property to nop
1941 : : * @name: name of the property to nop
1942 : : *
1943 : : * fdt_del_property() will delete the given property.
1944 : : *
1945 : : * This function will delete data from the blob, and will therefore
1946 : : * change the offsets of some existing nodes.
1947 : : *
1948 : : * returns:
1949 : : * 0, on success
1950 : : * -FDT_ERR_NOTFOUND, node does not have the named property
1951 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1952 : : * -FDT_ERR_BADLAYOUT,
1953 : : * -FDT_ERR_BADMAGIC,
1954 : : * -FDT_ERR_BADVERSION,
1955 : : * -FDT_ERR_BADSTATE,
1956 : : * -FDT_ERR_BADSTRUCTURE,
1957 : : * -FDT_ERR_TRUNCATED, standard meanings
1958 : : */
1959 : : int fdt_delprop(void *fdt, int nodeoffset, const char *name);
1960 : :
1961 : : /**
1962 : : * fdt_add_subnode_namelen - creates a new node based on substring
1963 : : * @fdt: pointer to the device tree blob
1964 : : * @parentoffset: structure block offset of a node
1965 : : * @name: name of the subnode to locate
1966 : : * @namelen: number of characters of name to consider
1967 : : *
1968 : : * Identical to fdt_add_subnode(), but use only the first namelen
1969 : : * characters of name as the name of the new node. This is useful for
1970 : : * creating subnodes based on a portion of a larger string, such as a
1971 : : * full path.
1972 : : */
1973 : : #ifndef SWIG /* Not available in Python */
1974 : : int fdt_add_subnode_namelen(void *fdt, int parentoffset,
1975 : : const char *name, int namelen);
1976 : : #endif
1977 : :
1978 : : /**
1979 : : * fdt_add_subnode - creates a new node
1980 : : * @fdt: pointer to the device tree blob
1981 : : * @parentoffset: structure block offset of a node
1982 : : * @name: name of the subnode to locate
1983 : : *
1984 : : * fdt_add_subnode() creates a new node as a subnode of the node at
1985 : : * structure block offset parentoffset, with the given name (which
1986 : : * should include the unit address, if any).
1987 : : *
1988 : : * This function will insert data into the blob, and will therefore
1989 : : * change the offsets of some existing nodes.
1990 : :
1991 : : * returns:
1992 : : * structure block offset of the created nodeequested subnode (>=0), on
1993 : : * success
1994 : : * -FDT_ERR_NOTFOUND, if the requested subnode does not exist
1995 : : * -FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE
1996 : : * tag
1997 : : * -FDT_ERR_EXISTS, if the node at parentoffset already has a subnode of
1998 : : * the given name
1999 : : * -FDT_ERR_NOSPACE, if there is insufficient free space in the
2000 : : * blob to contain the new node
2001 : : * -FDT_ERR_NOSPACE
2002 : : * -FDT_ERR_BADLAYOUT
2003 : : * -FDT_ERR_BADMAGIC,
2004 : : * -FDT_ERR_BADVERSION,
2005 : : * -FDT_ERR_BADSTATE,
2006 : : * -FDT_ERR_BADSTRUCTURE,
2007 : : * -FDT_ERR_TRUNCATED, standard meanings.
2008 : : */
2009 : : int fdt_add_subnode(void *fdt, int parentoffset, const char *name);
2010 : :
2011 : : /**
2012 : : * fdt_del_node - delete a node (subtree)
2013 : : * @fdt: pointer to the device tree blob
2014 : : * @nodeoffset: offset of the node to nop
2015 : : *
2016 : : * fdt_del_node() will remove the given node, including all its
2017 : : * subnodes if any, from the blob.
2018 : : *
2019 : : * This function will delete data from the blob, and will therefore
2020 : : * change the offsets of some existing nodes.
2021 : : *
2022 : : * returns:
2023 : : * 0, on success
2024 : : * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
2025 : : * -FDT_ERR_BADLAYOUT,
2026 : : * -FDT_ERR_BADMAGIC,
2027 : : * -FDT_ERR_BADVERSION,
2028 : : * -FDT_ERR_BADSTATE,
2029 : : * -FDT_ERR_BADSTRUCTURE,
2030 : : * -FDT_ERR_TRUNCATED, standard meanings
2031 : : */
2032 : : int fdt_del_node(void *fdt, int nodeoffset);
2033 : :
2034 : : /**
2035 : : * fdt_overlay_apply - Applies a DT overlay on a base DT
2036 : : * @fdt: pointer to the base device tree blob
2037 : : * @fdto: pointer to the device tree overlay blob
2038 : : *
2039 : : * fdt_overlay_apply() will apply the given device tree overlay on the
2040 : : * given base device tree.
2041 : : *
2042 : : * Expect the base device tree to be modified, even if the function
2043 : : * returns an error.
2044 : : *
2045 : : * returns:
2046 : : * 0, on success
2047 : : * -FDT_ERR_NOSPACE, there's not enough space in the base device tree
2048 : : * -FDT_ERR_NOTFOUND, the overlay points to some inexistant nodes or
2049 : : * properties in the base DT
2050 : : * -FDT_ERR_BADPHANDLE,
2051 : : * -FDT_ERR_BADOVERLAY,
2052 : : * -FDT_ERR_NOPHANDLES,
2053 : : * -FDT_ERR_INTERNAL,
2054 : : * -FDT_ERR_BADLAYOUT,
2055 : : * -FDT_ERR_BADMAGIC,
2056 : : * -FDT_ERR_BADOFFSET,
2057 : : * -FDT_ERR_BADPATH,
2058 : : * -FDT_ERR_BADVERSION,
2059 : : * -FDT_ERR_BADSTRUCTURE,
2060 : : * -FDT_ERR_BADSTATE,
2061 : : * -FDT_ERR_TRUNCATED, standard meanings
2062 : : */
2063 : : int fdt_overlay_apply(void *fdt, void *fdto);
2064 : :
2065 : : /**********************************************************************/
2066 : : /* Debugging / informational functions */
2067 : : /**********************************************************************/
2068 : :
2069 : : const char *fdt_strerror(int errval);
2070 : :
2071 : : #endif /* LIBFDT_H */
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