blob: 5b7821d0a1b6295941408d4d083fb661dfefe721 [file] [log] [blame]
Tom Rini10e47792018-05-06 17:58:06 -04001/* SPDX-License-Identifier: GPL-2.0+ */
Simon Glass1ccaa052017-05-18 20:08:54 -06002/*
3 * Originally from Linux v4.9
4 * Copyright (C) 1996-2005 Paul Mackerras.
5 *
6 * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
7 * Updates for SPARC64 by David S. Miller
8 * Derived from PowerPC and Sparc prom.h files by Stephen Rothwell, IBM Corp.
9 *
10 * Copyright (c) 2017 Google, Inc
11 * Written by Simon Glass <sjg@chromium.org>
12 *
13 * Modified for U-Boot
14 * Copyright (c) 2017 Google, Inc
Simon Glass1ccaa052017-05-18 20:08:54 -060015 */
16
17#ifndef _DM_OF_ACCESS_H
18#define _DM_OF_ACCESS_H
19
20#include <dm/of.h>
21
22/**
23 * of_find_all_nodes - Get next node in global list
24 * @prev: Previous node or NULL to start iteration
25 * of_node_put() will be called on it
26 *
27 * Returns a node pointer with refcount incremented, use
28 * of_node_put() on it when done.
29 */
30struct device_node *of_find_all_nodes(struct device_node *prev);
31
32#define for_each_of_allnodes_from(from, dn) \
33 for (dn = of_find_all_nodes(from); dn; dn = of_find_all_nodes(dn))
34#define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn)
35
36/* Dummy functions to mirror Linux. These are not used in U-Boot */
37#define of_node_get(x) (x)
38static inline void of_node_put(const struct device_node *np) { }
39
40/**
41 * of_n_addr_cells() - Get the number of address cells for a node
42 *
43 * This walks back up the tree to find the closest #address-cells property
44 * which controls the given node.
45 *
46 * @np: Node pointer to check
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +010047 * Return: number of address cells this node uses
Simon Glass1ccaa052017-05-18 20:08:54 -060048 */
49int of_n_addr_cells(const struct device_node *np);
50
51/**
52 * of_n_size_cells() - Get the number of size cells for a node
53 *
54 * This walks back up the tree to find the closest #size-cells property
55 * which controls the given node.
56 *
57 * @np: Node pointer to check
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +010058 * Return: number of size cells this node uses
Simon Glass1ccaa052017-05-18 20:08:54 -060059 */
60int of_n_size_cells(const struct device_node *np);
61
62/**
Simon Glass4191dc12017-06-12 06:21:31 -060063 * of_simple_addr_cells() - Get the address cells property in a node
64 *
65 * This function matches fdt_address_cells().
66 *
67 * @np: Node pointer to check
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +010068 * Return: value of #address-cells property in this node, or 2 if none
Simon Glass4191dc12017-06-12 06:21:31 -060069 */
70int of_simple_addr_cells(const struct device_node *np);
71
72/**
73 * of_simple_size_cells() - Get the size cells property in a node
74 *
75 * This function matches fdt_size_cells().
76 *
77 * @np: Node pointer to check
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +010078 * Return: value of #size-cells property in this node, or 2 if none
Simon Glass4191dc12017-06-12 06:21:31 -060079 */
80int of_simple_size_cells(const struct device_node *np);
81
82/**
Simon Glass1ccaa052017-05-18 20:08:54 -060083 * of_find_property() - find a property in a node
84 *
85 * @np: Pointer to device node holding property
86 * @name: Name of property
87 * @lenp: If non-NULL, returns length of property
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +010088 * Return: pointer to property, or NULL if not found
Simon Glass1ccaa052017-05-18 20:08:54 -060089 */
90struct property *of_find_property(const struct device_node *np,
91 const char *name, int *lenp);
92
93/**
94 * of_get_property() - get a property value
95 *
96 * Find a property with a given name for a given node and return the value.
97 *
98 * @np: Pointer to device node holding property
99 * @name: Name of property
100 * @lenp: If non-NULL, returns length of property
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100101 * Return: pointer to property value, or NULL if not found
Simon Glass1ccaa052017-05-18 20:08:54 -0600102 */
103const void *of_get_property(const struct device_node *np, const char *name,
104 int *lenp);
105
106/**
Patrick Delaunaycaee1552020-01-13 11:34:56 +0100107 * of_get_first_property()- get to the pointer of the first property
108 *
109 * Get pointer to the first property of the node, it is used to iterate
110 * and read all the property with of_get_next_property_by_prop().
111 *
112 * @np: Pointer to device node
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100113 * Return: pointer to property or NULL if not found
Patrick Delaunaycaee1552020-01-13 11:34:56 +0100114 */
115const struct property *of_get_first_property(const struct device_node *np);
116
117/**
118 * of_get_next_property() - get to the pointer of the next property
119 *
120 * Get pointer to the next property of the node, it is used to iterate
121 * and read all the property with of_get_property_by_prop().
122 *
123 * @np: Pointer to device node
124 * @property: pointer of the current property
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100125 * Return: pointer to next property or NULL if not found
Patrick Delaunaycaee1552020-01-13 11:34:56 +0100126 */
127const struct property *of_get_next_property(const struct device_node *np,
128 const struct property *property);
129
130/**
131 * of_get_property_by_prop() - get a property value of a node property
132 *
133 * Get value for the property identified by node and property pointer.
134 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100135 * @np: Pointer to device node
Patrick Delaunaycaee1552020-01-13 11:34:56 +0100136 * @property: pointer of the property to read
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100137 * @name: place to property name on success
Patrick Delaunaycaee1552020-01-13 11:34:56 +0100138 * @lenp: place to put length on success
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100139 * Return: pointer to property value or NULL if error
Patrick Delaunaycaee1552020-01-13 11:34:56 +0100140 */
141const void *of_get_property_by_prop(const struct device_node *np,
142 const struct property *property,
143 const char **name,
144 int *lenp);
145
146/**
Simon Glass1ccaa052017-05-18 20:08:54 -0600147 * of_device_is_compatible() - Check if the node matches given constraints
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100148 * @np: Pointer to device node
Simon Glass1ccaa052017-05-18 20:08:54 -0600149 * @compat: required compatible string, NULL or "" for any match
150 * @type: required device_type value, NULL or "" for any match
151 * @name: required node name, NULL or "" for any match
152 *
153 * Checks if the given @compat, @type and @name strings match the
154 * properties of the given @device. A constraints can be skipped by
155 * passing NULL or an empty string as the constraint.
156 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100157 * Return: 0 for no match, and a positive integer on match. The return
Simon Glass1ccaa052017-05-18 20:08:54 -0600158 * value is a relative score with larger values indicating better
159 * matches. The score is weighted for the most specific compatible value
160 * to get the highest score. Matching type is next, followed by matching
161 * name. Practically speaking, this results in the following priority
162 * order for matches:
163 *
164 * 1. specific compatible && type && name
165 * 2. specific compatible && type
166 * 3. specific compatible && name
167 * 4. specific compatible
168 * 5. general compatible && type && name
169 * 6. general compatible && type
170 * 7. general compatible && name
171 * 8. general compatible
172 * 9. type && name
173 * 10. type
174 * 11. name
175 */
176int of_device_is_compatible(const struct device_node *np, const char *compat,
177 const char *type, const char *name);
178
179/**
180 * of_device_is_available() - check if a device is available for use
181 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100182 * @np: Pointer to device node to check for availability
Simon Glass1ccaa052017-05-18 20:08:54 -0600183 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100184 * Return: true if the status property is absent or set to "okay", false
Simon Glass1ccaa052017-05-18 20:08:54 -0600185 * otherwise
186 */
187bool of_device_is_available(const struct device_node *np);
188
189/**
190 * of_get_parent() - Get a node's parent, if any
191 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100192 * @np: Pointer to device node to check
193 * Return: a node pointer, or NULL if none
Simon Glass1ccaa052017-05-18 20:08:54 -0600194 */
195struct device_node *of_get_parent(const struct device_node *np);
196
197/**
198 * of_find_node_opts_by_path() - Find a node matching a full OF path
199 *
Simon Glassef75c592022-07-30 15:52:08 -0600200 * Note that alias processing is only available on the control FDT (gd->of_root).
201 * For other trees it is skipped, so any attempt to obtain an alias will result
202 * in returning NULL.
203 *
204 * @root: Root node of the tree to use. If this is NULL, then gd->of_root is used
Simon Glass1ccaa052017-05-18 20:08:54 -0600205 * @path: Either the full path to match, or if the path does not start with
206 * '/', the name of a property of the /aliases node (an alias). In the
207 * case of an alias, the node matching the alias' value will be returned.
208 * @opts: Address of a pointer into which to store the start of an options
209 * string appended to the end of the path with a ':' separator. Can be NULL
210 *
211 * Valid paths:
212 * /foo/bar Full path
213 * foo Valid alias
214 * foo/bar Valid alias + relative path
215 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100216 * Return: a node pointer or NULL if not found
Simon Glass1ccaa052017-05-18 20:08:54 -0600217 */
Simon Glassef75c592022-07-30 15:52:08 -0600218struct device_node *of_find_node_opts_by_path(struct device_node *root,
219 const char *path,
Simon Glass1ccaa052017-05-18 20:08:54 -0600220 const char **opts);
221
222static inline struct device_node *of_find_node_by_path(const char *path)
223{
Simon Glassef75c592022-07-30 15:52:08 -0600224 return of_find_node_opts_by_path(NULL, path, NULL);
Simon Glass1ccaa052017-05-18 20:08:54 -0600225}
226
227/**
228 * of_find_compatible_node() - find a node based on its compatible string
229 *
230 * Find a node based on type and one of the tokens in its "compatible" property
231 * @from: Node to start searching from or NULL. the node you pass will not be
232 * searched, only the next one will; typically, you pass what the previous
233 * call returned.
234 * @type: The type string to match "device_type" or NULL to ignore
235 * @compatible: The string to match to one of the tokens in the device
236 * "compatible" list.
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100237 * Return: node pointer or NULL if not found
Simon Glass1ccaa052017-05-18 20:08:54 -0600238 */
239struct device_node *of_find_compatible_node(struct device_node *from,
240 const char *type, const char *compatible);
241
242/**
Jens Wiklander7b68dad2018-08-20 11:09:58 +0200243 * of_find_node_by_prop_value() - find a node with a given property value
244 *
245 * Find a node based on a property value.
246 * @from: Node to start searching from or NULL. the node you pass will not be
247 * searched, only the next one will; typically, you pass what the previous
248 * call returned.
249 * @propname: property name to check
250 * @propval: property value to search for
251 * @proplen: length of the value in propval
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100252 * Return: node pointer or NULL if not found
Jens Wiklander7b68dad2018-08-20 11:09:58 +0200253 */
254struct device_node *of_find_node_by_prop_value(struct device_node *from,
255 const char *propname,
256 const void *propval,
257 int proplen);
258/**
Simon Glass1ccaa052017-05-18 20:08:54 -0600259 * of_find_node_by_phandle() - Find a node given a phandle
260 *
261 * @handle: phandle of the node to find
262 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100263 * Return: node pointer, or NULL if not found
Simon Glass1ccaa052017-05-18 20:08:54 -0600264 */
265struct device_node *of_find_node_by_phandle(phandle handle);
266
267/**
268 * of_read_u32() - Find and read a 32-bit integer from a property
269 *
270 * Search for a property in a device node and read a 32-bit value from
271 * it.
272 *
273 * @np: device node from which the property value is to be read.
274 * @propname: name of the property to be searched.
275 * @outp: pointer to return value, modified only if return value is 0.
276 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100277 * Return: 0 on success, -EINVAL if the property does not exist,
Simon Glass1ccaa052017-05-18 20:08:54 -0600278 * -ENODATA if property does not have a value, and -EOVERFLOW if the
279 * property data isn't large enough.
280 */
281int of_read_u32(const struct device_node *np, const char *propname, u32 *outp);
282
283/**
Dario Binacchi81d80b52020-03-29 18:04:41 +0200284 * of_read_u32_index() - Find and read a 32-bit value from a multi-value
285 * property
286 *
287 * Search for a property in a device node and read a 32-bit value from
288 * it.
289 *
290 * @np: device node from which the property value is to be read.
291 * @propname: name of the property to be searched.
292 * @index: index of the u32 in the list of values
293 * @outp: pointer to return value, modified only if return value is 0.
294 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100295 * Return:
296 * 0 on success, -EINVAL if the property does not exist,
297 * -ENODATA if property does not have a value, and -EOVERFLOW if the
298 * property data isn't large enough.
Dario Binacchi81d80b52020-03-29 18:04:41 +0200299 */
300int of_read_u32_index(const struct device_node *np, const char *propname,
301 int index, u32 *outp);
302
303/**
Simon Glass9d54a7a2018-06-11 13:07:10 -0600304 * of_read_u64() - Find and read a 64-bit integer from a property
305 *
306 * Search for a property in a device node and read a 64-bit value from
307 * it.
308 *
309 * @np: device node from which the property value is to be read.
310 * @propname: name of the property to be searched.
311 * @outp: pointer to return value, modified only if return value is 0.
312 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100313 * Return:
314 * 0 on success, -EINVAL if the property does not exist,
315 * -ENODATA if property does not have a value, and -EOVERFLOW if the
316 * property data isn't large enough.
Simon Glass9d54a7a2018-06-11 13:07:10 -0600317 */
318int of_read_u64(const struct device_node *np, const char *propname, u64 *outp);
319
320/**
Simon Glass1ccaa052017-05-18 20:08:54 -0600321 * of_read_u32_array() - Find and read an array of 32 bit integers
322 *
323 * Search for a property in a device node and read 32-bit value(s) from
324 * it.
325 *
326 * @np: device node from which the property value is to be read.
327 * @propname: name of the property to be searched.
328 * @out_values: pointer to return value, modified only if return value is 0.
329 * @sz: number of array elements to read
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100330 * Return:
331 * 0 on success, -EINVAL if the property does not exist, -ENODATA
332 * if property does not have a value, and -EOVERFLOW is longer than sz.
Simon Glass1ccaa052017-05-18 20:08:54 -0600333 */
334int of_read_u32_array(const struct device_node *np, const char *propname,
335 u32 *out_values, size_t sz);
336
337/**
338 * of_property_match_string() - Find string in a list and return index
339 *
340 * This function searches a string list property and returns the index
341 * of a specific string value.
342 *
343 * @np: pointer to node containing string list property
344 * @propname: string list property name
345 * @string: pointer to string to search for in string list
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100346 * Return:
347 * 0 on success, -EINVAL if the property does not exist, -ENODATA
348 * if property does not have a value, and -EOVERFLOW is longer than sz.
Simon Glass1ccaa052017-05-18 20:08:54 -0600349 */
350int of_property_match_string(const struct device_node *np, const char *propname,
351 const char *string);
352
353int of_property_read_string_helper(const struct device_node *np,
354 const char *propname, const char **out_strs,
355 size_t sz, int index);
356
357/**
358 * of_property_read_string_index() - Find and read a string from a multiple
359 * strings property.
360 * @np: device node from which the property value is to be read.
361 * @propname: name of the property to be searched.
362 * @index: index of the string in the list of strings
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100363 * @output: pointer to null terminated return string, modified only if
Simon Glass1ccaa052017-05-18 20:08:54 -0600364 * return value is 0.
365 *
366 * Search for a property in a device tree node and retrieve a null
367 * terminated string value (pointer to data, not a copy) in the list of strings
368 * contained in that property.
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100369 *
370 * Return:
371 * 0 on success, -EINVAL if the property does not exist, -ENODATA if
372 * property does not have a value, and -EILSEQ if the string is not
373 * null-terminated within the length of the property data.
Simon Glass1ccaa052017-05-18 20:08:54 -0600374 *
375 * The out_string pointer is modified only if a valid string can be decoded.
376 */
377static inline int of_property_read_string_index(const struct device_node *np,
378 const char *propname,
379 int index, const char **output)
380{
381 int rc = of_property_read_string_helper(np, propname, output, 1, index);
382 return rc < 0 ? rc : 0;
383}
384
385/**
Simon Glass5fdb0052017-06-12 06:21:28 -0600386 * of_property_count_strings() - Find and return the number of strings from a
387 * multiple strings property.
388 * @np: device node from which the property value is to be read.
389 * @propname: name of the property to be searched.
390 *
391 * Search for a property in a device tree node and retrieve the number of null
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100392 * terminated string contain in it.
393 *
394 * Return:
395 * the number of strings on success, -EINVAL if the property does not exist,
396 * -ENODATA if property does not have a value, and -EILSEQ if the string is
397 * not null-terminated within the length of the property data.
Simon Glass5fdb0052017-06-12 06:21:28 -0600398 */
399static inline int of_property_count_strings(const struct device_node *np,
400 const char *propname)
401{
402 return of_property_read_string_helper(np, propname, NULL, 0, 0);
403}
404
405/**
Simon Glass1ccaa052017-05-18 20:08:54 -0600406 * of_parse_phandle - Resolve a phandle property to a device_node pointer
407 * @np: Pointer to device node holding phandle property
408 * @phandle_name: Name of property holding a phandle value
409 * @index: For properties holding a table of phandles, this is the index into
410 * the table
411 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100412 * Return:
413 * the device_node pointer with refcount incremented. Use
414 * of_node_put() on it when done.
Simon Glass1ccaa052017-05-18 20:08:54 -0600415 */
416struct device_node *of_parse_phandle(const struct device_node *np,
417 const char *phandle_name, int index);
418
419/**
420 * of_parse_phandle_with_args() - Find a node pointed by phandle in a list
421 *
422 * @np: pointer to a device tree node containing a list
423 * @list_name: property name that contains a list
424 * @cells_name: property name that specifies phandles' arguments count
Patrick Delaunay21e3b042020-09-10 18:26:17 +0200425 * @cells_count: Cell count to use if @cells_name is NULL
Simon Glass1ccaa052017-05-18 20:08:54 -0600426 * @index: index of a phandle to parse out
427 * @out_args: optional pointer to output arguments structure (will be filled)
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100428 * Return:
429 * 0 on success (with @out_args filled out if not NULL), -ENOENT if
430 * @list_name does not exist, -EINVAL if a phandle was not found,
431 * @cells_name could not be found, the arguments were truncated or there
432 * were too many arguments.
Simon Glass1ccaa052017-05-18 20:08:54 -0600433 *
434 * This function is useful to parse lists of phandles and their arguments.
435 * Returns 0 on success and fills out_args, on error returns appropriate
436 * errno value.
437 *
438 * Caller is responsible to call of_node_put() on the returned out_args->np
439 * pointer.
440 *
441 * Example:
442 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100443 * .. code-block::
Simon Glass1ccaa052017-05-18 20:08:54 -0600444 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100445 * phandle1: node1 {
446 * #list-cells = <2>;
447 * };
448 * phandle2: node2 {
449 * #list-cells = <1>;
450 * };
451 * node3 {
452 * list = <&phandle1 1 2 &phandle2 3>;
453 * };
Simon Glass1ccaa052017-05-18 20:08:54 -0600454 *
455 * To get a device_node of the `node2' node you may call this:
456 * of_parse_phandle_with_args(node3, "list", "#list-cells", 1, &args);
457 */
458int of_parse_phandle_with_args(const struct device_node *np,
459 const char *list_name, const char *cells_name,
Patrick Delaunay21e3b042020-09-10 18:26:17 +0200460 int cells_count, int index,
461 struct of_phandle_args *out_args);
Simon Glass1ccaa052017-05-18 20:08:54 -0600462
463/**
Patrice Chotardbe7dd602017-07-18 11:57:08 +0200464 * of_count_phandle_with_args() - Count the number of phandle in a list
465 *
466 * @np: pointer to a device tree node containing a list
467 * @list_name: property name that contains a list
468 * @cells_name: property name that specifies phandles' arguments count
Patrick Delaunayd776a842020-09-25 09:41:14 +0200469 * @cells_count: Cell count to use if @cells_name is NULL
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100470 * Return:
471 * number of phandle found, -ENOENT if @list_name does not exist,
472 * -EINVAL if a phandle was not found, @cells_name could not be found,
473 * the arguments were truncated or there were too many arguments.
Patrice Chotardbe7dd602017-07-18 11:57:08 +0200474 *
475 * Returns number of phandle found on success, on error returns appropriate
476 * errno value.
Patrice Chotardbe7dd602017-07-18 11:57:08 +0200477 */
478int of_count_phandle_with_args(const struct device_node *np,
Patrick Delaunayd776a842020-09-25 09:41:14 +0200479 const char *list_name, const char *cells_name,
480 int cells_count);
Patrice Chotardbe7dd602017-07-18 11:57:08 +0200481
482/**
Simon Glass1ccaa052017-05-18 20:08:54 -0600483 * of_alias_scan() - Scan all properties of the 'aliases' node
484 *
485 * The function scans all the properties of the 'aliases' node and populates
486 * the lookup table with the properties. It returns the number of alias
487 * properties found, or an error code in case of failure.
488 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100489 * Return: 9 if OK, -ENOMEM if not enough memory
Simon Glass1ccaa052017-05-18 20:08:54 -0600490 */
491int of_alias_scan(void);
492
493/**
494 * of_alias_get_id - Get alias id for the given device_node
495 *
496 * Travels the lookup table to get the alias id for the given device_node and
497 * alias stem.
498 *
499 * @np: Pointer to the given device_node
500 * @stem: Alias stem of the given device_node
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100501 * Return: alias ID, if found, else -ENODEV
Simon Glass1ccaa052017-05-18 20:08:54 -0600502 */
503int of_alias_get_id(const struct device_node *np, const char *stem);
504
505/**
Michal Simekc6203cb2019-01-31 16:30:57 +0100506 * of_alias_get_highest_id - Get highest alias id for the given stem
507 * @stem: Alias stem to be examined
508 *
509 * The function travels the lookup table to get the highest alias id for the
510 * given alias stem.
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100511 * Return: alias ID, if found, else -1
Michal Simekc6203cb2019-01-31 16:30:57 +0100512 */
513int of_alias_get_highest_id(const char *stem);
514
515/**
Simon Glass1ccaa052017-05-18 20:08:54 -0600516 * of_get_stdout() - Get node to use for stdout
517 *
Patrick Delaunay92c1c5c2022-01-12 10:53:49 +0100518 * Return: node referred to by stdout-path alias, or NULL if none
Simon Glass1ccaa052017-05-18 20:08:54 -0600519 */
520struct device_node *of_get_stdout(void);
521
Simon Glass3ee3d152022-07-30 15:52:13 -0600522/**
523 * of_write_prop() - Write a property to the device tree
524 *
525 * @np: device node to which the property value is to be written
526 * @propname: name of the property to write
527 * @value: value of the property
528 * @len: length of the property in bytes
529 * Returns: 0 if OK, -ve on error
530 */
531int of_write_prop(struct device_node *np, const char *propname, int len,
532 const void *value);
533
Simon Glass1ccaa052017-05-18 20:08:54 -0600534#endif