4 * libfdt - Flat Device Tree manipulation
5 * Copyright (C) 2006 David Gibson, IBM Corporation.
7 * libfdt is dual licensed: you can use it either under the terms of
8 * the GPL, or the BSD license, at your option.
10 * a) This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of the
13 * License, or (at your option) any later version.
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public
21 * License along with this library; if not, write to the Free
22 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
27 * b) Redistribution and use in source and binary forms, with or
28 * without modification, are permitted provided that the following
31 * 1. Redistributions of source code must retain the above
32 * copyright notice, this list of conditions and the following
34 * 2. Redistributions in binary form must reproduce the above
35 * copyright notice, this list of conditions and the following
36 * disclaimer in the documentation and/or other materials
37 * provided with the distribution.
39 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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41 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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43 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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51 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
54 #include <libfdt_env.h>
57 #define FDT_FIRST_SUPPORTED_VERSION 0x10
58 #define FDT_LAST_SUPPORTED_VERSION 0x11
60 /* Error codes: informative error codes */
61 #define FDT_ERR_NOTFOUND 1
62 /* FDT_ERR_NOTFOUND: The requested node or property does not exist */
63 #define FDT_ERR_EXISTS 2
64 /* FDT_ERR_EXISTS: Attemped to create a node or property which
66 #define FDT_ERR_NOSPACE 3
67 /* FDT_ERR_NOSPACE: Operation needed to expand the device
68 * tree, but its buffer did not have sufficient space to
69 * contain the expanded tree. Use fdt_open_into() to move the
70 * device tree to a buffer with more space. */
72 /* Error codes: codes for bad parameters */
73 #define FDT_ERR_BADOFFSET 4
74 /* FDT_ERR_BADOFFSET: Function was passed a structure block
75 * offset which is out-of-bounds, or which points to an
76 * unsuitable part of the structure for the operation. */
77 #define FDT_ERR_BADPATH 5
78 /* FDT_ERR_BADPATH: Function was passed a badly formatted path
79 * (e.g. missing a leading / for a function which requires an
81 #define FDT_ERR_BADPHANDLE 6
82 /* FDT_ERR_BADPHANDLE: Function was passed an invalid phandle
83 * value. phandle values of 0 and -1 are not permitted. */
84 #define FDT_ERR_BADSTATE 7
85 /* FDT_ERR_BADSTATE: Function was passed an incomplete device
86 * tree created by the sequential-write functions, which is
87 * not sufficiently complete for the requested operation. */
89 /* Error codes: codes for bad device tree blobs */
90 #define FDT_ERR_TRUNCATED 8
91 /* FDT_ERR_TRUNCATED: Structure block of the given device tree
92 * ends without an FDT_END tag. */
93 #define FDT_ERR_BADMAGIC 9
94 /* FDT_ERR_BADMAGIC: Given "device tree" appears not to be a
95 * device tree at all - it is missing the flattened device
96 * tree magic number. */
97 #define FDT_ERR_BADVERSION 10
98 /* FDT_ERR_BADVERSION: Given device tree has a version which
99 * can't be handled by the requested operation. For
100 * read-write functions, this may mean that fdt_open_into() is
101 * required to convert the tree to the expected version. */
102 #define FDT_ERR_BADSTRUCTURE 11
103 /* FDT_ERR_BADSTRUCTURE: Given device tree has a corrupt
104 * structure block or other serious error (e.g. misnested
105 * nodes, or subnodes preceding properties). */
106 #define FDT_ERR_BADLAYOUT 12
107 /* FDT_ERR_BADLAYOUT: For read-write functions, the given
108 * device tree has it's sub-blocks in an order that the
109 * function can't handle (memory reserve map, then structure,
110 * then strings). Use fdt_open_into() to reorganize the tree
111 * into a form suitable for the read-write operations. */
113 /* "Can't happen" error indicating a bug in libfdt */
114 #define FDT_ERR_INTERNAL 13
115 /* FDT_ERR_INTERNAL: libfdt has failed an internal assertion.
116 * Should never be returned, if it is, it indicates a bug in
119 #define FDT_ERR_MAX 13
121 /**********************************************************************/
122 /* Low-level functions (you probably don't need these) */
123 /**********************************************************************/
125 const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int checklen);
126 static inline void *fdt_offset_ptr_w(void *fdt, int offset, int checklen)
128 return (void *)(uintptr_t)fdt_offset_ptr(fdt, offset, checklen);
131 uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset);
133 /**********************************************************************/
134 /* Traversal functions */
135 /**********************************************************************/
137 int fdt_next_node(const void *fdt, int offset, int *depth);
139 /**********************************************************************/
140 /* General functions */
141 /**********************************************************************/
143 #define fdt_get_header(fdt, field) \
144 (fdt32_to_cpu(((const struct fdt_header *)(fdt))->field))
145 #define fdt_magic(fdt) (fdt_get_header(fdt, magic))
146 #define fdt_totalsize(fdt) (fdt_get_header(fdt, totalsize))
147 #define fdt_off_dt_struct(fdt) (fdt_get_header(fdt, off_dt_struct))
148 #define fdt_off_dt_strings(fdt) (fdt_get_header(fdt, off_dt_strings))
149 #define fdt_off_mem_rsvmap(fdt) (fdt_get_header(fdt, off_mem_rsvmap))
150 #define fdt_version(fdt) (fdt_get_header(fdt, version))
151 #define fdt_last_comp_version(fdt) (fdt_get_header(fdt, last_comp_version))
152 #define fdt_boot_cpuid_phys(fdt) (fdt_get_header(fdt, boot_cpuid_phys))
153 #define fdt_size_dt_strings(fdt) (fdt_get_header(fdt, size_dt_strings))
154 #define fdt_size_dt_struct(fdt) (fdt_get_header(fdt, size_dt_struct))
156 #define __fdt_set_hdr(name) \
157 static inline void fdt_set_##name(void *fdt, uint32_t val) \
159 struct fdt_header *fdth = (struct fdt_header*)fdt; \
160 fdth->name = cpu_to_fdt32(val); \
162 __fdt_set_hdr(magic);
163 __fdt_set_hdr(totalsize);
164 __fdt_set_hdr(off_dt_struct);
165 __fdt_set_hdr(off_dt_strings);
166 __fdt_set_hdr(off_mem_rsvmap);
167 __fdt_set_hdr(version);
168 __fdt_set_hdr(last_comp_version);
169 __fdt_set_hdr(boot_cpuid_phys);
170 __fdt_set_hdr(size_dt_strings);
171 __fdt_set_hdr(size_dt_struct);
175 * fdt_check_header - sanity check a device tree or possible device tree
176 * @fdt: pointer to data which might be a flattened device tree
178 * fdt_check_header() checks that the given buffer contains what
179 * appears to be a flattened device tree with sane information in its
183 * 0, if the buffer appears to contain a valid device tree
185 * -FDT_ERR_BADVERSION,
186 * -FDT_ERR_BADSTATE, standard meanings, as above
188 int fdt_check_header(const void *fdt);
191 * fdt_move - move a device tree around in memory
192 * @fdt: pointer to the device tree to move
193 * @buf: pointer to memory where the device is to be moved
194 * @bufsize: size of the memory space at buf
196 * fdt_move() relocates, if possible, the device tree blob located at
197 * fdt to the buffer at buf of size bufsize. The buffer may overlap
198 * with the existing device tree blob at fdt. Therefore,
199 * fdt_move(fdt, fdt, fdt_totalsize(fdt))
200 * should always succeed.
204 * -FDT_ERR_NOSPACE, bufsize is insufficient to contain the device tree
206 * -FDT_ERR_BADVERSION,
207 * -FDT_ERR_BADSTATE, standard meanings
209 int fdt_move(const void *fdt, void *buf, int bufsize);
211 /**********************************************************************/
212 /* Read-only functions */
213 /**********************************************************************/
216 * fdt_string - retrieve a string from the strings block of a device tree
217 * @fdt: pointer to the device tree blob
218 * @stroffset: offset of the string within the strings block (native endian)
220 * fdt_string() retrieves a pointer to a single string from the
221 * strings block of the device tree blob at fdt.
224 * a pointer to the string, on success
225 * NULL, if stroffset is out of bounds
227 const char *fdt_string(const void *fdt, int stroffset);
230 * fdt_num_mem_rsv - retrieve the number of memory reserve map entries
231 * @fdt: pointer to the device tree blob
233 * Returns the number of entries in the device tree blob's memory
234 * reservation map. This does not include the terminating 0,0 entry
235 * or any other (0,0) entries reserved for expansion.
238 * the number of entries
240 int fdt_num_mem_rsv(const void *fdt);
243 * fdt_get_mem_rsv - retrieve one memory reserve map entry
244 * @fdt: pointer to the device tree blob
245 * @address, @size: pointers to 64-bit variables
247 * On success, *address and *size will contain the address and size of
248 * the n-th reserve map entry from the device tree blob, in
249 * native-endian format.
254 * -FDT_ERR_BADVERSION,
255 * -FDT_ERR_BADSTATE, standard meanings
257 int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size);
260 * fdt_subnode_offset_namelen - find a subnode based on substring
261 * @fdt: pointer to the device tree blob
262 * @parentoffset: structure block offset of a node
263 * @name: name of the subnode to locate
264 * @namelen: number of characters of name to consider
266 * Identical to fdt_subnode_offset(), but only examine the first
267 * namelen characters of name for matching the subnode name. This is
268 * useful for finding subnodes based on a portion of a larger string,
269 * such as a full path.
271 int fdt_subnode_offset_namelen(const void *fdt, int parentoffset,
272 const char *name, int namelen);
274 * fdt_subnode_offset - find a subnode of a given node
275 * @fdt: pointer to the device tree blob
276 * @parentoffset: structure block offset of a node
277 * @name: name of the subnode to locate
279 * fdt_subnode_offset() finds a subnode of the node at structure block
280 * offset parentoffset with the given name. name may include a unit
281 * address, in which case fdt_subnode_offset() will find the subnode
282 * with that unit address, or the unit address may be omitted, in
283 * which case fdt_subnode_offset() will find an arbitrary subnode
284 * whose name excluding unit address matches the given name.
287 * structure block offset of the requested subnode (>=0), on success
288 * -FDT_ERR_NOTFOUND, if the requested subnode does not exist
289 * -FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE tag
291 * -FDT_ERR_BADVERSION,
293 * -FDT_ERR_BADSTRUCTURE,
294 * -FDT_ERR_TRUNCATED, standard meanings.
296 int fdt_subnode_offset(const void *fdt, int parentoffset, const char *name);
299 * fdt_path_offset - find a tree node by its full path
300 * @fdt: pointer to the device tree blob
301 * @path: full path of the node to locate
303 * fdt_path_offset() finds a node of a given path in the device tree.
304 * Each path component may omit the unit address portion, but the
305 * results of this are undefined if any such path component is
306 * ambiguous (that is if there are multiple nodes at the relevant
307 * level matching the given component, differentiated only by unit
311 * structure block offset of the node with the requested path (>=0), on success
312 * -FDT_ERR_BADPATH, given path does not begin with '/' or is invalid
313 * -FDT_ERR_NOTFOUND, if the requested node does not exist
315 * -FDT_ERR_BADVERSION,
317 * -FDT_ERR_BADSTRUCTURE,
318 * -FDT_ERR_TRUNCATED, standard meanings.
320 int fdt_path_offset(const void *fdt, const char *path);
323 * fdt_get_name - retrieve the name of a given node
324 * @fdt: pointer to the device tree blob
325 * @nodeoffset: structure block offset of the starting node
326 * @lenp: pointer to an integer variable (will be overwritten) or NULL
328 * fdt_get_name() retrieves the name (including unit address) of the
329 * device tree node at structure block offset nodeoffset. If lenp is
330 * non-NULL, the length of this name is also returned, in the integer
331 * pointed to by lenp.
334 * pointer to the node's name, on success
335 * If lenp is non-NULL, *lenp contains the length of that name (>=0)
337 * if lenp is non-NULL *lenp contains an error code (<0):
338 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
340 * -FDT_ERR_BADVERSION,
341 * -FDT_ERR_BADSTATE, standard meanings
343 const char *fdt_get_name(const void *fdt, int nodeoffset, int *lenp);
346 * fdt_first_property_offset - find the offset of a node's first property
347 * @fdt: pointer to the device tree blob
348 * @nodeoffset: structure block offset of a node
350 * fdt_first_property_offset() finds the first property of the node at
351 * the given structure block offset.
354 * structure block offset of the property (>=0), on success
355 * -FDT_ERR_NOTFOUND, if the requested node has no properties
356 * -FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_BEGIN_NODE tag
358 * -FDT_ERR_BADVERSION,
360 * -FDT_ERR_BADSTRUCTURE,
361 * -FDT_ERR_TRUNCATED, standard meanings.
363 int fdt_first_property_offset(const void *fdt, int nodeoffset);
366 * fdt_next_property_offset - step through a node's properties
367 * @fdt: pointer to the device tree blob
368 * @offset: structure block offset of a property
370 * fdt_next_property_offset() finds the property immediately after the
371 * one at the given structure block offset. This will be a property
372 * of the same node as the given property.
375 * structure block offset of the next property (>=0), on success
376 * -FDT_ERR_NOTFOUND, if the given property is the last in its node
377 * -FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_PROP tag
379 * -FDT_ERR_BADVERSION,
381 * -FDT_ERR_BADSTRUCTURE,
382 * -FDT_ERR_TRUNCATED, standard meanings.
384 int fdt_next_property_offset(const void *fdt, int offset);
387 * fdt_get_property_by_offset - retrieve the property at a given offset
388 * @fdt: pointer to the device tree blob
389 * @offset: offset of the property to retrieve
390 * @lenp: pointer to an integer variable (will be overwritten) or NULL
392 * fdt_get_property_by_offset() retrieves a pointer to the
393 * fdt_property structure within the device tree blob at the given
394 * offset. If lenp is non-NULL, the length of the property value is
395 * also returned, in the integer pointed to by lenp.
398 * pointer to the structure representing the property
399 * if lenp is non-NULL, *lenp contains the length of the property
402 * if lenp is non-NULL, *lenp contains an error code (<0):
403 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag
405 * -FDT_ERR_BADVERSION,
407 * -FDT_ERR_BADSTRUCTURE,
408 * -FDT_ERR_TRUNCATED, standard meanings
410 const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
415 * fdt_get_property_namelen - find a property based on substring
416 * @fdt: pointer to the device tree blob
417 * @nodeoffset: offset of the node whose property to find
418 * @name: name of the property to find
419 * @namelen: number of characters of name to consider
420 * @lenp: pointer to an integer variable (will be overwritten) or NULL
422 * Identical to fdt_get_property_namelen(), but only examine the first
423 * namelen characters of name for matching the property name.
425 const struct fdt_property *fdt_get_property_namelen(const void *fdt,
428 int namelen, int *lenp);
431 * fdt_get_property - find a given property in a given node
432 * @fdt: pointer to the device tree blob
433 * @nodeoffset: offset of the node whose property to find
434 * @name: name of the property to find
435 * @lenp: pointer to an integer variable (will be overwritten) or NULL
437 * fdt_get_property() retrieves a pointer to the fdt_property
438 * structure within the device tree blob corresponding to the property
439 * named 'name' of the node at offset nodeoffset. If lenp is
440 * non-NULL, the length of the property value is also returned, in the
441 * integer pointed to by lenp.
444 * pointer to the structure representing the property
445 * if lenp is non-NULL, *lenp contains the length of the property
448 * if lenp is non-NULL, *lenp contains an error code (<0):
449 * -FDT_ERR_NOTFOUND, node does not have named property
450 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
452 * -FDT_ERR_BADVERSION,
454 * -FDT_ERR_BADSTRUCTURE,
455 * -FDT_ERR_TRUNCATED, standard meanings
457 const struct fdt_property *fdt_get_property(const void *fdt, int nodeoffset,
458 const char *name, int *lenp);
459 static inline struct fdt_property *fdt_get_property_w(void *fdt, int nodeoffset,
463 return (struct fdt_property *)(uintptr_t)
464 fdt_get_property(fdt, nodeoffset, name, lenp);
468 * fdt_getprop_by_offset - retrieve the value of a property at a given offset
469 * @fdt: pointer to the device tree blob
470 * @ffset: offset of the property to read
471 * @namep: pointer to a string variable (will be overwritten) or NULL
472 * @lenp: pointer to an integer variable (will be overwritten) or NULL
474 * fdt_getprop_by_offset() retrieves a pointer to the value of the
475 * property at structure block offset 'offset' (this will be a pointer
476 * to within the device blob itself, not a copy of the value). If
477 * lenp is non-NULL, the length of the property value is also
478 * returned, in the integer pointed to by lenp. If namep is non-NULL,
479 * the property's namne will also be returned in the char * pointed to
480 * by namep (this will be a pointer to within the device tree's string
481 * block, not a new copy of the name).
484 * pointer to the property's value
485 * if lenp is non-NULL, *lenp contains the length of the property
487 * if namep is non-NULL *namep contiains a pointer to the property
490 * if lenp is non-NULL, *lenp contains an error code (<0):
491 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag
493 * -FDT_ERR_BADVERSION,
495 * -FDT_ERR_BADSTRUCTURE,
496 * -FDT_ERR_TRUNCATED, standard meanings
498 const void *fdt_getprop_by_offset(const void *fdt, int offset,
499 const char **namep, int *lenp);
502 * fdt_getprop_namelen - get property value based on substring
503 * @fdt: pointer to the device tree blob
504 * @nodeoffset: offset of the node whose property to find
505 * @name: name of the property to find
506 * @namelen: number of characters of name to consider
507 * @lenp: pointer to an integer variable (will be overwritten) or NULL
509 * Identical to fdt_getprop(), but only examine the first namelen
510 * characters of name for matching the property name.
512 const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
513 const char *name, int namelen, int *lenp);
516 * fdt_getprop - retrieve the value of a given property
517 * @fdt: pointer to the device tree blob
518 * @nodeoffset: offset of the node whose property to find
519 * @name: name of the property to find
520 * @lenp: pointer to an integer variable (will be overwritten) or NULL
522 * fdt_getprop() retrieves a pointer to the value of the property
523 * named 'name' of the node at offset nodeoffset (this will be a
524 * pointer to within the device blob itself, not a copy of the value).
525 * If lenp is non-NULL, the length of the property value is also
526 * returned, in the integer pointed to by lenp.
529 * pointer to the property's value
530 * if lenp is non-NULL, *lenp contains the length of the property
533 * if lenp is non-NULL, *lenp contains an error code (<0):
534 * -FDT_ERR_NOTFOUND, node does not have named property
535 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
537 * -FDT_ERR_BADVERSION,
539 * -FDT_ERR_BADSTRUCTURE,
540 * -FDT_ERR_TRUNCATED, standard meanings
542 const void *fdt_getprop(const void *fdt, int nodeoffset,
543 const char *name, int *lenp);
544 static inline void *fdt_getprop_w(void *fdt, int nodeoffset,
545 const char *name, int *lenp)
547 return (void *)(uintptr_t)fdt_getprop(fdt, nodeoffset, name, lenp);
551 * fdt_get_phandle - retrieve the phandle of a given node
552 * @fdt: pointer to the device tree blob
553 * @nodeoffset: structure block offset of the node
555 * fdt_get_phandle() retrieves the phandle of the device tree node at
556 * structure block offset nodeoffset.
559 * the phandle of the node at nodeoffset, on success (!= 0, != -1)
560 * 0, if the node has no phandle, or another error occurs
562 uint32_t fdt_get_phandle(const void *fdt, int nodeoffset);
565 * fdt_get_alias_namelen - get alias based on substring
566 * @fdt: pointer to the device tree blob
567 * @name: name of the alias th look up
568 * @namelen: number of characters of name to consider
570 * Identical to fdt_get_alias(), but only examine the first namelen
571 * characters of name for matching the alias name.
573 const char *fdt_get_alias_namelen(const void *fdt,
574 const char *name, int namelen);
577 * fdt_get_alias - retreive the path referenced by a given alias
578 * @fdt: pointer to the device tree blob
579 * @name: name of the alias th look up
581 * fdt_get_alias() retrieves the value of a given alias. That is, the
582 * value of the property named 'name' in the node /aliases.
585 * a pointer to the expansion of the alias named 'name', if it exists
586 * NULL, if the given alias or the /aliases node does not exist
588 const char *fdt_get_alias(const void *fdt, const char *name);
591 * fdt_get_path - determine the full path of a node
592 * @fdt: pointer to the device tree blob
593 * @nodeoffset: offset of the node whose path to find
594 * @buf: character buffer to contain the returned path (will be overwritten)
595 * @buflen: size of the character buffer at buf
597 * fdt_get_path() computes the full path of the node at offset
598 * nodeoffset, and records that path in the buffer at buf.
600 * NOTE: This function is expensive, as it must scan the device tree
601 * structure from the start to nodeoffset.
605 * buf contains the absolute path of the node at
606 * nodeoffset, as a NUL-terminated string.
607 * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
608 * -FDT_ERR_NOSPACE, the path of the given node is longer than (bufsize-1)
609 * characters and will not fit in the given buffer.
611 * -FDT_ERR_BADVERSION,
613 * -FDT_ERR_BADSTRUCTURE, standard meanings
615 int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen);
618 * fdt_supernode_atdepth_offset - find a specific ancestor of a node
619 * @fdt: pointer to the device tree blob
620 * @nodeoffset: offset of the node whose parent to find
621 * @supernodedepth: depth of the ancestor to find
622 * @nodedepth: pointer to an integer variable (will be overwritten) or NULL
624 * fdt_supernode_atdepth_offset() finds an ancestor of the given node
625 * at a specific depth from the root (where the root itself has depth
626 * 0, its immediate subnodes depth 1 and so forth). So
627 * fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, NULL);
628 * will always return 0, the offset of the root node. If the node at
629 * nodeoffset has depth D, then:
630 * fdt_supernode_atdepth_offset(fdt, nodeoffset, D, NULL);
631 * will return nodeoffset itself.
633 * NOTE: This function is expensive, as it must scan the device tree
634 * structure from the start to nodeoffset.
638 * structure block offset of the node at node offset's ancestor
639 * of depth supernodedepth (>=0), on success
640 * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
641 * -FDT_ERR_NOTFOUND, supernodedepth was greater than the depth of nodeoffset
643 * -FDT_ERR_BADVERSION,
645 * -FDT_ERR_BADSTRUCTURE, standard meanings
647 int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
648 int supernodedepth, int *nodedepth);
651 * fdt_node_depth - find the depth of a given node
652 * @fdt: pointer to the device tree blob
653 * @nodeoffset: offset of the node whose parent to find
655 * fdt_node_depth() finds the depth of a given node. The root node
656 * has depth 0, its immediate subnodes depth 1 and so forth.
658 * NOTE: This function is expensive, as it must scan the device tree
659 * structure from the start to nodeoffset.
662 * depth of the node at nodeoffset (>=0), on success
663 * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
665 * -FDT_ERR_BADVERSION,
667 * -FDT_ERR_BADSTRUCTURE, standard meanings
669 int fdt_node_depth(const void *fdt, int nodeoffset);
672 * fdt_parent_offset - find the parent of a given node
673 * @fdt: pointer to the device tree blob
674 * @nodeoffset: offset of the node whose parent to find
676 * fdt_parent_offset() locates the parent node of a given node (that
677 * is, it finds the offset of the node which contains the node at
678 * nodeoffset as a subnode).
680 * NOTE: This function is expensive, as it must scan the device tree
681 * structure from the start to nodeoffset, *twice*.
684 * structure block offset of the parent of the node at nodeoffset
686 * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
688 * -FDT_ERR_BADVERSION,
690 * -FDT_ERR_BADSTRUCTURE, standard meanings
692 int fdt_parent_offset(const void *fdt, int nodeoffset);
695 * fdt_node_offset_by_prop_value - find nodes with a given property value
696 * @fdt: pointer to the device tree blob
697 * @startoffset: only find nodes after this offset
698 * @propname: property name to check
699 * @propval: property value to search for
700 * @proplen: length of the value in propval
702 * fdt_node_offset_by_prop_value() returns the offset of the first
703 * node after startoffset, which has a property named propname whose
704 * value is of length proplen and has value equal to propval; or if
705 * startoffset is -1, the very first such node in the tree.
707 * To iterate through all nodes matching the criterion, the following
709 * offset = fdt_node_offset_by_prop_value(fdt, -1, propname,
711 * while (offset != -FDT_ERR_NOTFOUND) {
712 * ... other code here ...
713 * offset = fdt_node_offset_by_prop_value(fdt, offset, propname,
717 * Note the -1 in the first call to the function, if 0 is used here
718 * instead, the function will never locate the root node, even if it
719 * matches the criterion.
722 * structure block offset of the located node (>= 0, >startoffset),
724 * -FDT_ERR_NOTFOUND, no node matching the criterion exists in the
725 * tree after startoffset
726 * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
728 * -FDT_ERR_BADVERSION,
730 * -FDT_ERR_BADSTRUCTURE, standard meanings
732 int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
733 const char *propname,
734 const void *propval, int proplen);
737 * fdt_node_offset_by_phandle - find the node with a given phandle
738 * @fdt: pointer to the device tree blob
739 * @phandle: phandle value
741 * fdt_node_offset_by_phandle() returns the offset of the node
742 * which has the given phandle value. If there is more than one node
743 * in the tree with the given phandle (an invalid tree), results are
747 * structure block offset of the located node (>= 0), on success
748 * -FDT_ERR_NOTFOUND, no node with that phandle exists
749 * -FDT_ERR_BADPHANDLE, given phandle value was invalid (0 or -1)
751 * -FDT_ERR_BADVERSION,
753 * -FDT_ERR_BADSTRUCTURE, standard meanings
755 int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle);
758 * fdt_node_check_compatible: check a node's compatible property
759 * @fdt: pointer to the device tree blob
760 * @nodeoffset: offset of a tree node
761 * @compatible: string to match against
764 * fdt_node_check_compatible() returns 0 if the given node contains a
765 * 'compatible' property with the given string as one of its elements,
766 * it returns non-zero otherwise, or on error.
769 * 0, if the node has a 'compatible' property listing the given string
770 * 1, if the node has a 'compatible' property, but it does not list
772 * -FDT_ERR_NOTFOUND, if the given node has no 'compatible' property
773 * -FDT_ERR_BADOFFSET, if nodeoffset does not refer to a BEGIN_NODE tag
775 * -FDT_ERR_BADVERSION,
777 * -FDT_ERR_BADSTRUCTURE, standard meanings
779 int fdt_node_check_compatible(const void *fdt, int nodeoffset,
780 const char *compatible);
783 * fdt_node_offset_by_compatible - find nodes with a given 'compatible' value
784 * @fdt: pointer to the device tree blob
785 * @startoffset: only find nodes after this offset
786 * @compatible: 'compatible' string to match against
788 * fdt_node_offset_by_compatible() returns the offset of the first
789 * node after startoffset, which has a 'compatible' property which
790 * lists the given compatible string; or if startoffset is -1, the
791 * very first such node in the tree.
793 * To iterate through all nodes matching the criterion, the following
795 * offset = fdt_node_offset_by_compatible(fdt, -1, compatible);
796 * while (offset != -FDT_ERR_NOTFOUND) {
797 * ... other code here ...
798 * offset = fdt_node_offset_by_compatible(fdt, offset, compatible);
801 * Note the -1 in the first call to the function, if 0 is used here
802 * instead, the function will never locate the root node, even if it
803 * matches the criterion.
806 * structure block offset of the located node (>= 0, >startoffset),
808 * -FDT_ERR_NOTFOUND, no node matching the criterion exists in the
809 * tree after startoffset
810 * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
812 * -FDT_ERR_BADVERSION,
814 * -FDT_ERR_BADSTRUCTURE, standard meanings
816 int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
817 const char *compatible);
820 * fdt_stringlist_contains - check a string list property for a string
821 * @strlist: Property containing a list of strings to check
822 * @listlen: Length of property
823 * @str: String to search for
825 * This is a utility function provided for convenience. The list contains
826 * one or more strings, each terminated by \0, as is found in a device tree
827 * "compatible" property.
829 * @return: 1 if the string is found in the list, 0 not found, or invalid list
831 int fdt_stringlist_contains(const char *strlist, int listlen, const char *str);
833 /**********************************************************************/
834 /* Write-in-place functions */
835 /**********************************************************************/
838 * fdt_setprop_inplace - change a property's value, but not its size
839 * @fdt: pointer to the device tree blob
840 * @nodeoffset: offset of the node whose property to change
841 * @name: name of the property to change
842 * @val: pointer to data to replace the property value with
843 * @len: length of the property value
845 * fdt_setprop_inplace() replaces the value of a given property with
846 * the data in val, of length len. This function cannot change the
847 * size of a property, and so will only work if len is equal to the
848 * current length of the property.
850 * This function will alter only the bytes in the blob which contain
851 * the given property value, and will not alter or move any other part
856 * -FDT_ERR_NOSPACE, if len is not equal to the property's current length
857 * -FDT_ERR_NOTFOUND, node does not have the named property
858 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
860 * -FDT_ERR_BADVERSION,
862 * -FDT_ERR_BADSTRUCTURE,
863 * -FDT_ERR_TRUNCATED, standard meanings
865 int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
866 const void *val, int len);
869 * fdt_setprop_inplace_u32 - change the value of a 32-bit integer property
870 * @fdt: pointer to the device tree blob
871 * @nodeoffset: offset of the node whose property to change
872 * @name: name of the property to change
873 * @val: 32-bit integer value to replace the property with
875 * fdt_setprop_inplace_u32() replaces the value of a given property
876 * with the 32-bit integer value in val, converting val to big-endian
877 * if necessary. This function cannot change the size of a property,
878 * and so will only work if the property already exists and has length
881 * This function will alter only the bytes in the blob which contain
882 * the given property value, and will not alter or move any other part
887 * -FDT_ERR_NOSPACE, if the property's length is not equal to 4
888 * -FDT_ERR_NOTFOUND, node does not have the named property
889 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
891 * -FDT_ERR_BADVERSION,
893 * -FDT_ERR_BADSTRUCTURE,
894 * -FDT_ERR_TRUNCATED, standard meanings
896 static inline int fdt_setprop_inplace_u32(void *fdt, int nodeoffset,
897 const char *name, uint32_t val)
899 fdt32_t tmp = cpu_to_fdt32(val);
900 return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp));
904 * fdt_setprop_inplace_u64 - change the value of a 64-bit integer property
905 * @fdt: pointer to the device tree blob
906 * @nodeoffset: offset of the node whose property to change
907 * @name: name of the property to change
908 * @val: 64-bit integer value to replace the property with
910 * fdt_setprop_inplace_u64() replaces the value of a given property
911 * with the 64-bit integer value in val, converting val to big-endian
912 * if necessary. This function cannot change the size of a property,
913 * and so will only work if the property already exists and has length
916 * This function will alter only the bytes in the blob which contain
917 * the given property value, and will not alter or move any other part
922 * -FDT_ERR_NOSPACE, if the property's length is not equal to 8
923 * -FDT_ERR_NOTFOUND, node does not have the named property
924 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
926 * -FDT_ERR_BADVERSION,
928 * -FDT_ERR_BADSTRUCTURE,
929 * -FDT_ERR_TRUNCATED, standard meanings
931 static inline int fdt_setprop_inplace_u64(void *fdt, int nodeoffset,
932 const char *name, uint64_t val)
934 fdt64_t tmp = cpu_to_fdt64(val);
935 return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp));
939 * fdt_setprop_inplace_cell - change the value of a single-cell property
941 * This is an alternative name for fdt_setprop_inplace_u32()
943 static inline int fdt_setprop_inplace_cell(void *fdt, int nodeoffset,
944 const char *name, uint32_t val)
946 return fdt_setprop_inplace_u32(fdt, nodeoffset, name, val);
950 * fdt_nop_property - replace a property with nop tags
951 * @fdt: pointer to the device tree blob
952 * @nodeoffset: offset of the node whose property to nop
953 * @name: name of the property to nop
955 * fdt_nop_property() will replace a given property's representation
956 * in the blob with FDT_NOP tags, effectively removing it from the
959 * This function will alter only the bytes in the blob which contain
960 * the property, and will not alter or move any other part of the
965 * -FDT_ERR_NOTFOUND, node does not have the named property
966 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
968 * -FDT_ERR_BADVERSION,
970 * -FDT_ERR_BADSTRUCTURE,
971 * -FDT_ERR_TRUNCATED, standard meanings
973 int fdt_nop_property(void *fdt, int nodeoffset, const char *name);
976 * fdt_nop_node - replace a node (subtree) with nop tags
977 * @fdt: pointer to the device tree blob
978 * @nodeoffset: offset of the node to nop
980 * fdt_nop_node() will replace a given node's representation in the
981 * blob, including all its subnodes, if any, with FDT_NOP tags,
982 * effectively removing it from the tree.
984 * This function will alter only the bytes in the blob which contain
985 * the node and its properties and subnodes, and will not alter or
986 * move any other part of the tree.
990 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
992 * -FDT_ERR_BADVERSION,
994 * -FDT_ERR_BADSTRUCTURE,
995 * -FDT_ERR_TRUNCATED, standard meanings
997 int fdt_nop_node(void *fdt, int nodeoffset);
999 /**********************************************************************/
1000 /* Sequential write functions */
1001 /**********************************************************************/
1003 int fdt_create(void *buf, int bufsize);
1004 int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size);
1005 int fdt_finish_reservemap(void *fdt);
1006 int fdt_begin_node(void *fdt, const char *name);
1007 int fdt_property(void *fdt, const char *name, const void *val, int len);
1008 static inline int fdt_property_u32(void *fdt, const char *name, uint32_t val)
1010 fdt32_t tmp = cpu_to_fdt32(val);
1011 return fdt_property(fdt, name, &tmp, sizeof(tmp));
1013 static inline int fdt_property_u64(void *fdt, const char *name, uint64_t val)
1015 fdt64_t tmp = cpu_to_fdt64(val);
1016 return fdt_property(fdt, name, &tmp, sizeof(tmp));
1018 static inline int fdt_property_cell(void *fdt, const char *name, uint32_t val)
1020 return fdt_property_u32(fdt, name, val);
1022 #define fdt_property_string(fdt, name, str) \
1023 fdt_property(fdt, name, str, strlen(str)+1)
1024 int fdt_end_node(void *fdt);
1025 int fdt_finish(void *fdt);
1027 /**********************************************************************/
1028 /* Read-write functions */
1029 /**********************************************************************/
1031 int fdt_create_empty_tree(void *buf, int bufsize);
1032 int fdt_open_into(const void *fdt, void *buf, int bufsize);
1033 int fdt_pack(void *fdt);
1036 * fdt_add_mem_rsv - add one memory reserve map entry
1037 * @fdt: pointer to the device tree blob
1038 * @address, @size: 64-bit values (native endian)
1040 * Adds a reserve map entry to the given blob reserving a region at
1041 * address address of length size.
1043 * This function will insert data into the reserve map and will
1044 * therefore change the indexes of some entries in the table.
1048 * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1049 * contain the new reservation entry
1050 * -FDT_ERR_BADMAGIC,
1051 * -FDT_ERR_BADVERSION,
1052 * -FDT_ERR_BADSTATE,
1053 * -FDT_ERR_BADSTRUCTURE,
1054 * -FDT_ERR_BADLAYOUT,
1055 * -FDT_ERR_TRUNCATED, standard meanings
1057 int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size);
1060 * fdt_del_mem_rsv - remove a memory reserve map entry
1061 * @fdt: pointer to the device tree blob
1062 * @n: entry to remove
1064 * fdt_del_mem_rsv() removes the n-th memory reserve map entry from
1067 * This function will delete data from the reservation table and will
1068 * therefore change the indexes of some entries in the table.
1072 * -FDT_ERR_NOTFOUND, there is no entry of the given index (i.e. there
1073 * are less than n+1 reserve map entries)
1074 * -FDT_ERR_BADMAGIC,
1075 * -FDT_ERR_BADVERSION,
1076 * -FDT_ERR_BADSTATE,
1077 * -FDT_ERR_BADSTRUCTURE,
1078 * -FDT_ERR_BADLAYOUT,
1079 * -FDT_ERR_TRUNCATED, standard meanings
1081 int fdt_del_mem_rsv(void *fdt, int n);
1084 * fdt_set_name - change the name of a given node
1085 * @fdt: pointer to the device tree blob
1086 * @nodeoffset: structure block offset of a node
1087 * @name: name to give the node
1089 * fdt_set_name() replaces the name (including unit address, if any)
1090 * of the given node with the given string. NOTE: this function can't
1091 * efficiently check if the new name is unique amongst the given
1092 * node's siblings; results are undefined if this function is invoked
1093 * with a name equal to one of the given node's siblings.
1095 * This function may insert or delete data from the blob, and will
1096 * therefore change the offsets of some existing nodes.
1100 * -FDT_ERR_NOSPACE, there is insufficient free space in the blob
1101 * to contain the new name
1102 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1103 * -FDT_ERR_BADMAGIC,
1104 * -FDT_ERR_BADVERSION,
1105 * -FDT_ERR_BADSTATE, standard meanings
1107 int fdt_set_name(void *fdt, int nodeoffset, const char *name);
1110 * fdt_setprop - create or change a property
1111 * @fdt: pointer to the device tree blob
1112 * @nodeoffset: offset of the node whose property to change
1113 * @name: name of the property to change
1114 * @val: pointer to data to set the property value to
1115 * @len: length of the property value
1117 * fdt_setprop() sets the value of the named property in the given
1118 * node to the given value and length, creating the property if it
1119 * does not already exist.
1121 * This function may insert or delete data from the blob, and will
1122 * therefore change the offsets of some existing nodes.
1126 * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1127 * contain the new property value
1128 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1129 * -FDT_ERR_BADLAYOUT,
1130 * -FDT_ERR_BADMAGIC,
1131 * -FDT_ERR_BADVERSION,
1132 * -FDT_ERR_BADSTATE,
1133 * -FDT_ERR_BADSTRUCTURE,
1134 * -FDT_ERR_BADLAYOUT,
1135 * -FDT_ERR_TRUNCATED, standard meanings
1137 int fdt_setprop(void *fdt, int nodeoffset, const char *name,
1138 const void *val, int len);
1141 * fdt_setprop_u32 - set a property to a 32-bit integer
1142 * @fdt: pointer to the device tree blob
1143 * @nodeoffset: offset of the node whose property to change
1144 * @name: name of the property to change
1145 * @val: 32-bit integer value for the property (native endian)
1147 * fdt_setprop_u32() sets the value of the named property in the given
1148 * node to the given 32-bit integer value (converting to big-endian if
1149 * necessary), or creates a new property with that value if it does
1150 * not already exist.
1152 * This function may insert or delete data from the blob, and will
1153 * therefore change the offsets of some existing nodes.
1157 * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1158 * contain the new property value
1159 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1160 * -FDT_ERR_BADLAYOUT,
1161 * -FDT_ERR_BADMAGIC,
1162 * -FDT_ERR_BADVERSION,
1163 * -FDT_ERR_BADSTATE,
1164 * -FDT_ERR_BADSTRUCTURE,
1165 * -FDT_ERR_BADLAYOUT,
1166 * -FDT_ERR_TRUNCATED, standard meanings
1168 static inline int fdt_setprop_u32(void *fdt, int nodeoffset, const char *name,
1171 fdt32_t tmp = cpu_to_fdt32(val);
1172 return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
1176 * fdt_setprop_u64 - set a property to a 64-bit integer
1177 * @fdt: pointer to the device tree blob
1178 * @nodeoffset: offset of the node whose property to change
1179 * @name: name of the property to change
1180 * @val: 64-bit integer value for the property (native endian)
1182 * fdt_setprop_u64() sets the value of the named property in the given
1183 * node to the given 64-bit integer value (converting to big-endian if
1184 * necessary), or creates a new property with that value if it does
1185 * not already exist.
1187 * This function may insert or delete data from the blob, and will
1188 * therefore change the offsets of some existing nodes.
1192 * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1193 * contain the new property value
1194 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1195 * -FDT_ERR_BADLAYOUT,
1196 * -FDT_ERR_BADMAGIC,
1197 * -FDT_ERR_BADVERSION,
1198 * -FDT_ERR_BADSTATE,
1199 * -FDT_ERR_BADSTRUCTURE,
1200 * -FDT_ERR_BADLAYOUT,
1201 * -FDT_ERR_TRUNCATED, standard meanings
1203 static inline int fdt_setprop_u64(void *fdt, int nodeoffset, const char *name,
1206 fdt64_t tmp = cpu_to_fdt64(val);
1207 return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
1211 * fdt_setprop_cell - set a property to a single cell value
1213 * This is an alternative name for fdt_setprop_u32()
1215 static inline int fdt_setprop_cell(void *fdt, int nodeoffset, const char *name,
1218 return fdt_setprop_u32(fdt, nodeoffset, name, val);
1222 * fdt_setprop_string - set a property to a string value
1223 * @fdt: pointer to the device tree blob
1224 * @nodeoffset: offset of the node whose property to change
1225 * @name: name of the property to change
1226 * @str: string value for the property
1228 * fdt_setprop_string() sets the value of the named property in the
1229 * given node to the given string value (using the length of the
1230 * string to determine the new length of the property), or creates a
1231 * new property with that value if it does not already exist.
1233 * This function may insert or delete data from the blob, and will
1234 * therefore change the offsets of some existing nodes.
1238 * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1239 * contain the new property value
1240 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1241 * -FDT_ERR_BADLAYOUT,
1242 * -FDT_ERR_BADMAGIC,
1243 * -FDT_ERR_BADVERSION,
1244 * -FDT_ERR_BADSTATE,
1245 * -FDT_ERR_BADSTRUCTURE,
1246 * -FDT_ERR_BADLAYOUT,
1247 * -FDT_ERR_TRUNCATED, standard meanings
1249 #define fdt_setprop_string(fdt, nodeoffset, name, str) \
1250 fdt_setprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
1253 * fdt_appendprop - append to or create a property
1254 * @fdt: pointer to the device tree blob
1255 * @nodeoffset: offset of the node whose property to change
1256 * @name: name of the property to append to
1257 * @val: pointer to data to append to the property value
1258 * @len: length of the data to append to the property value
1260 * fdt_appendprop() appends the value to the named property in the
1261 * given node, creating the property if it does not already exist.
1263 * This function may insert data into the blob, and will therefore
1264 * change the offsets of some existing nodes.
1268 * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1269 * contain the new property value
1270 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1271 * -FDT_ERR_BADLAYOUT,
1272 * -FDT_ERR_BADMAGIC,
1273 * -FDT_ERR_BADVERSION,
1274 * -FDT_ERR_BADSTATE,
1275 * -FDT_ERR_BADSTRUCTURE,
1276 * -FDT_ERR_BADLAYOUT,
1277 * -FDT_ERR_TRUNCATED, standard meanings
1279 int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
1280 const void *val, int len);
1283 * fdt_appendprop_u32 - append a 32-bit integer value to a property
1284 * @fdt: pointer to the device tree blob
1285 * @nodeoffset: offset of the node whose property to change
1286 * @name: name of the property to change
1287 * @val: 32-bit integer value to append to the property (native endian)
1289 * fdt_appendprop_u32() appends the given 32-bit integer value
1290 * (converting to big-endian if necessary) to the value of the named
1291 * property in the given node, or creates a new property with that
1292 * value if it does not already exist.
1294 * This function may insert data into the blob, and will therefore
1295 * change the offsets of some existing nodes.
1299 * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1300 * contain the new property value
1301 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1302 * -FDT_ERR_BADLAYOUT,
1303 * -FDT_ERR_BADMAGIC,
1304 * -FDT_ERR_BADVERSION,
1305 * -FDT_ERR_BADSTATE,
1306 * -FDT_ERR_BADSTRUCTURE,
1307 * -FDT_ERR_BADLAYOUT,
1308 * -FDT_ERR_TRUNCATED, standard meanings
1310 static inline int fdt_appendprop_u32(void *fdt, int nodeoffset,
1311 const char *name, uint32_t val)
1313 fdt32_t tmp = cpu_to_fdt32(val);
1314 return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
1318 * fdt_appendprop_u64 - append a 64-bit integer value to a property
1319 * @fdt: pointer to the device tree blob
1320 * @nodeoffset: offset of the node whose property to change
1321 * @name: name of the property to change
1322 * @val: 64-bit integer value to append to the property (native endian)
1324 * fdt_appendprop_u64() appends the given 64-bit integer value
1325 * (converting to big-endian if necessary) to the value of the named
1326 * property in the given node, or creates a new property with that
1327 * value if it does not already exist.
1329 * This function may insert data into the blob, and will therefore
1330 * change the offsets of some existing nodes.
1334 * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1335 * contain the new property value
1336 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1337 * -FDT_ERR_BADLAYOUT,
1338 * -FDT_ERR_BADMAGIC,
1339 * -FDT_ERR_BADVERSION,
1340 * -FDT_ERR_BADSTATE,
1341 * -FDT_ERR_BADSTRUCTURE,
1342 * -FDT_ERR_BADLAYOUT,
1343 * -FDT_ERR_TRUNCATED, standard meanings
1345 static inline int fdt_appendprop_u64(void *fdt, int nodeoffset,
1346 const char *name, uint64_t val)
1348 fdt64_t tmp = cpu_to_fdt64(val);
1349 return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
1353 * fdt_appendprop_cell - append a single cell value to a property
1355 * This is an alternative name for fdt_appendprop_u32()
1357 static inline int fdt_appendprop_cell(void *fdt, int nodeoffset,
1358 const char *name, uint32_t val)
1360 return fdt_appendprop_u32(fdt, nodeoffset, name, val);
1364 * fdt_appendprop_string - append a string to a property
1365 * @fdt: pointer to the device tree blob
1366 * @nodeoffset: offset of the node whose property to change
1367 * @name: name of the property to change
1368 * @str: string value to append to the property
1370 * fdt_appendprop_string() appends the given string to the value of
1371 * the named property in the given node, or creates a new property
1372 * with that value if it does not already exist.
1374 * This function may insert data into the blob, and will therefore
1375 * change the offsets of some existing nodes.
1379 * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
1380 * contain the new property value
1381 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1382 * -FDT_ERR_BADLAYOUT,
1383 * -FDT_ERR_BADMAGIC,
1384 * -FDT_ERR_BADVERSION,
1385 * -FDT_ERR_BADSTATE,
1386 * -FDT_ERR_BADSTRUCTURE,
1387 * -FDT_ERR_BADLAYOUT,
1388 * -FDT_ERR_TRUNCATED, standard meanings
1390 #define fdt_appendprop_string(fdt, nodeoffset, name, str) \
1391 fdt_appendprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
1394 * fdt_delprop - delete a property
1395 * @fdt: pointer to the device tree blob
1396 * @nodeoffset: offset of the node whose property to nop
1397 * @name: name of the property to nop
1399 * fdt_del_property() will delete the given property.
1401 * This function will delete data from the blob, and will therefore
1402 * change the offsets of some existing nodes.
1406 * -FDT_ERR_NOTFOUND, node does not have the named property
1407 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1408 * -FDT_ERR_BADLAYOUT,
1409 * -FDT_ERR_BADMAGIC,
1410 * -FDT_ERR_BADVERSION,
1411 * -FDT_ERR_BADSTATE,
1412 * -FDT_ERR_BADSTRUCTURE,
1413 * -FDT_ERR_TRUNCATED, standard meanings
1415 int fdt_delprop(void *fdt, int nodeoffset, const char *name);
1418 * fdt_add_subnode_namelen - creates a new node based on substring
1419 * @fdt: pointer to the device tree blob
1420 * @parentoffset: structure block offset of a node
1421 * @name: name of the subnode to locate
1422 * @namelen: number of characters of name to consider
1424 * Identical to fdt_add_subnode(), but use only the first namelen
1425 * characters of name as the name of the new node. This is useful for
1426 * creating subnodes based on a portion of a larger string, such as a
1429 int fdt_add_subnode_namelen(void *fdt, int parentoffset,
1430 const char *name, int namelen);
1433 * fdt_add_subnode - creates a new node
1434 * @fdt: pointer to the device tree blob
1435 * @parentoffset: structure block offset of a node
1436 * @name: name of the subnode to locate
1438 * fdt_add_subnode() creates a new node as a subnode of the node at
1439 * structure block offset parentoffset, with the given name (which
1440 * should include the unit address, if any).
1442 * This function will insert data into the blob, and will therefore
1443 * change the offsets of some existing nodes.
1446 * structure block offset of the created nodeequested subnode (>=0), on success
1447 * -FDT_ERR_NOTFOUND, if the requested subnode does not exist
1448 * -FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE tag
1449 * -FDT_ERR_EXISTS, if the node at parentoffset already has a subnode of
1451 * -FDT_ERR_NOSPACE, if there is insufficient free space in the
1452 * blob to contain the new node
1454 * -FDT_ERR_BADLAYOUT
1455 * -FDT_ERR_BADMAGIC,
1456 * -FDT_ERR_BADVERSION,
1457 * -FDT_ERR_BADSTATE,
1458 * -FDT_ERR_BADSTRUCTURE,
1459 * -FDT_ERR_TRUNCATED, standard meanings.
1461 int fdt_add_subnode(void *fdt, int parentoffset, const char *name);
1464 * fdt_del_node - delete a node (subtree)
1465 * @fdt: pointer to the device tree blob
1466 * @nodeoffset: offset of the node to nop
1468 * fdt_del_node() will remove the given node, including all its
1469 * subnodes if any, from the blob.
1471 * This function will delete data from the blob, and will therefore
1472 * change the offsets of some existing nodes.
1476 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
1477 * -FDT_ERR_BADLAYOUT,
1478 * -FDT_ERR_BADMAGIC,
1479 * -FDT_ERR_BADVERSION,
1480 * -FDT_ERR_BADSTATE,
1481 * -FDT_ERR_BADSTRUCTURE,
1482 * -FDT_ERR_TRUNCATED, standard meanings
1484 int fdt_del_node(void *fdt, int nodeoffset);
1486 /**********************************************************************/
1487 /* Debugging / informational functions */
1488 /**********************************************************************/
1490 const char *fdt_strerror(int errval);
1492 #endif /* _LIBFDT_H */