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1df09bc6 SA |
1 | /* |
2 | * drivers/of/property.c - Procedures for accessing and interpreting | |
3 | * Devicetree properties and graphs. | |
4 | * | |
5 | * Initially created by copying procedures from drivers/of/base.c. This | |
6 | * file contains the OF property as well as the OF graph interface | |
7 | * functions. | |
8 | * | |
9 | * Paul Mackerras August 1996. | |
10 | * Copyright (C) 1996-2005 Paul Mackerras. | |
11 | * | |
12 | * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. | |
13 | * {engebret|bergner}@us.ibm.com | |
14 | * | |
15 | * Adapted for sparc and sparc64 by David S. Miller davem@davemloft.net | |
16 | * | |
17 | * Reconsolidated from arch/x/kernel/prom.c by Stephen Rothwell and | |
18 | * Grant Likely. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or | |
21 | * modify it under the terms of the GNU General Public License | |
22 | * as published by the Free Software Foundation; either version | |
23 | * 2 of the License, or (at your option) any later version. | |
24 | */ | |
25 | ||
26 | #define pr_fmt(fmt) "OF: " fmt | |
27 | ||
28 | #include <linux/of.h> | |
29 | #include <linux/of_device.h> | |
30 | #include <linux/of_graph.h> | |
31 | #include <linux/string.h> | |
32 | ||
33 | #include "of_private.h" | |
34 | ||
35 | /** | |
36 | * of_property_count_elems_of_size - Count the number of elements in a property | |
37 | * | |
38 | * @np: device node from which the property value is to be read. | |
39 | * @propname: name of the property to be searched. | |
40 | * @elem_size: size of the individual element | |
41 | * | |
42 | * Search for a property in a device node and count the number of elements of | |
43 | * size elem_size in it. Returns number of elements on sucess, -EINVAL if the | |
44 | * property does not exist or its length does not match a multiple of elem_size | |
45 | * and -ENODATA if the property does not have a value. | |
46 | */ | |
47 | int of_property_count_elems_of_size(const struct device_node *np, | |
48 | const char *propname, int elem_size) | |
49 | { | |
50 | struct property *prop = of_find_property(np, propname, NULL); | |
51 | ||
52 | if (!prop) | |
53 | return -EINVAL; | |
54 | if (!prop->value) | |
55 | return -ENODATA; | |
56 | ||
57 | if (prop->length % elem_size != 0) { | |
0d638a07 RH |
58 | pr_err("size of %s in node %pOF is not a multiple of %d\n", |
59 | propname, np, elem_size); | |
1df09bc6 SA |
60 | return -EINVAL; |
61 | } | |
62 | ||
63 | return prop->length / elem_size; | |
64 | } | |
65 | EXPORT_SYMBOL_GPL(of_property_count_elems_of_size); | |
66 | ||
67 | /** | |
68 | * of_find_property_value_of_size | |
69 | * | |
70 | * @np: device node from which the property value is to be read. | |
71 | * @propname: name of the property to be searched. | |
72 | * @min: minimum allowed length of property value | |
73 | * @max: maximum allowed length of property value (0 means unlimited) | |
74 | * @len: if !=NULL, actual length is written to here | |
75 | * | |
76 | * Search for a property in a device node and valid the requested size. | |
77 | * Returns the property value on success, -EINVAL if the property does not | |
78 | * exist, -ENODATA if property does not have a value, and -EOVERFLOW if the | |
79 | * property data is too small or too large. | |
80 | * | |
81 | */ | |
82 | static void *of_find_property_value_of_size(const struct device_node *np, | |
83 | const char *propname, u32 min, u32 max, size_t *len) | |
84 | { | |
85 | struct property *prop = of_find_property(np, propname, NULL); | |
86 | ||
87 | if (!prop) | |
88 | return ERR_PTR(-EINVAL); | |
89 | if (!prop->value) | |
90 | return ERR_PTR(-ENODATA); | |
91 | if (prop->length < min) | |
92 | return ERR_PTR(-EOVERFLOW); | |
93 | if (max && prop->length > max) | |
94 | return ERR_PTR(-EOVERFLOW); | |
95 | ||
96 | if (len) | |
97 | *len = prop->length; | |
98 | ||
99 | return prop->value; | |
100 | } | |
101 | ||
102 | /** | |
103 | * of_property_read_u32_index - Find and read a u32 from a multi-value property. | |
104 | * | |
105 | * @np: device node from which the property value is to be read. | |
106 | * @propname: name of the property to be searched. | |
107 | * @index: index of the u32 in the list of values | |
108 | * @out_value: pointer to return value, modified only if no error. | |
109 | * | |
110 | * Search for a property in a device node and read nth 32-bit value from | |
111 | * it. Returns 0 on success, -EINVAL if the property does not exist, | |
112 | * -ENODATA if property does not have a value, and -EOVERFLOW if the | |
113 | * property data isn't large enough. | |
114 | * | |
115 | * The out_value is modified only if a valid u32 value can be decoded. | |
116 | */ | |
117 | int of_property_read_u32_index(const struct device_node *np, | |
118 | const char *propname, | |
119 | u32 index, u32 *out_value) | |
120 | { | |
121 | const u32 *val = of_find_property_value_of_size(np, propname, | |
122 | ((index + 1) * sizeof(*out_value)), | |
123 | 0, | |
124 | NULL); | |
125 | ||
126 | if (IS_ERR(val)) | |
127 | return PTR_ERR(val); | |
128 | ||
129 | *out_value = be32_to_cpup(((__be32 *)val) + index); | |
130 | return 0; | |
131 | } | |
132 | EXPORT_SYMBOL_GPL(of_property_read_u32_index); | |
133 | ||
134 | /** | |
135 | * of_property_read_u64_index - Find and read a u64 from a multi-value property. | |
136 | * | |
137 | * @np: device node from which the property value is to be read. | |
138 | * @propname: name of the property to be searched. | |
139 | * @index: index of the u64 in the list of values | |
140 | * @out_value: pointer to return value, modified only if no error. | |
141 | * | |
142 | * Search for a property in a device node and read nth 64-bit value from | |
143 | * it. Returns 0 on success, -EINVAL if the property does not exist, | |
144 | * -ENODATA if property does not have a value, and -EOVERFLOW if the | |
145 | * property data isn't large enough. | |
146 | * | |
147 | * The out_value is modified only if a valid u64 value can be decoded. | |
148 | */ | |
149 | int of_property_read_u64_index(const struct device_node *np, | |
150 | const char *propname, | |
151 | u32 index, u64 *out_value) | |
152 | { | |
153 | const u64 *val = of_find_property_value_of_size(np, propname, | |
154 | ((index + 1) * sizeof(*out_value)), | |
155 | 0, NULL); | |
156 | ||
157 | if (IS_ERR(val)) | |
158 | return PTR_ERR(val); | |
159 | ||
160 | *out_value = be64_to_cpup(((__be64 *)val) + index); | |
161 | return 0; | |
162 | } | |
163 | EXPORT_SYMBOL_GPL(of_property_read_u64_index); | |
164 | ||
165 | /** | |
166 | * of_property_read_variable_u8_array - Find and read an array of u8 from a | |
167 | * property, with bounds on the minimum and maximum array size. | |
168 | * | |
169 | * @np: device node from which the property value is to be read. | |
170 | * @propname: name of the property to be searched. | |
171 | * @out_values: pointer to return value, modified only if return value is 0. | |
172 | * @sz_min: minimum number of array elements to read | |
173 | * @sz_max: maximum number of array elements to read, if zero there is no | |
174 | * upper limit on the number of elements in the dts entry but only | |
175 | * sz_min will be read. | |
176 | * | |
177 | * Search for a property in a device node and read 8-bit value(s) from | |
178 | * it. Returns number of elements read on success, -EINVAL if the property | |
179 | * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW | |
180 | * if the property data is smaller than sz_min or longer than sz_max. | |
181 | * | |
182 | * dts entry of array should be like: | |
183 | * property = /bits/ 8 <0x50 0x60 0x70>; | |
184 | * | |
185 | * The out_values is modified only if a valid u8 value can be decoded. | |
186 | */ | |
187 | int of_property_read_variable_u8_array(const struct device_node *np, | |
188 | const char *propname, u8 *out_values, | |
189 | size_t sz_min, size_t sz_max) | |
190 | { | |
191 | size_t sz, count; | |
192 | const u8 *val = of_find_property_value_of_size(np, propname, | |
193 | (sz_min * sizeof(*out_values)), | |
194 | (sz_max * sizeof(*out_values)), | |
195 | &sz); | |
196 | ||
197 | if (IS_ERR(val)) | |
198 | return PTR_ERR(val); | |
199 | ||
200 | if (!sz_max) | |
201 | sz = sz_min; | |
202 | else | |
203 | sz /= sizeof(*out_values); | |
204 | ||
205 | count = sz; | |
206 | while (count--) | |
207 | *out_values++ = *val++; | |
208 | ||
209 | return sz; | |
210 | } | |
211 | EXPORT_SYMBOL_GPL(of_property_read_variable_u8_array); | |
212 | ||
213 | /** | |
214 | * of_property_read_variable_u16_array - Find and read an array of u16 from a | |
215 | * property, with bounds on the minimum and maximum array size. | |
216 | * | |
217 | * @np: device node from which the property value is to be read. | |
218 | * @propname: name of the property to be searched. | |
219 | * @out_values: pointer to return value, modified only if return value is 0. | |
220 | * @sz_min: minimum number of array elements to read | |
221 | * @sz_max: maximum number of array elements to read, if zero there is no | |
222 | * upper limit on the number of elements in the dts entry but only | |
223 | * sz_min will be read. | |
224 | * | |
225 | * Search for a property in a device node and read 16-bit value(s) from | |
226 | * it. Returns number of elements read on success, -EINVAL if the property | |
227 | * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW | |
228 | * if the property data is smaller than sz_min or longer than sz_max. | |
229 | * | |
230 | * dts entry of array should be like: | |
231 | * property = /bits/ 16 <0x5000 0x6000 0x7000>; | |
232 | * | |
233 | * The out_values is modified only if a valid u16 value can be decoded. | |
234 | */ | |
235 | int of_property_read_variable_u16_array(const struct device_node *np, | |
236 | const char *propname, u16 *out_values, | |
237 | size_t sz_min, size_t sz_max) | |
238 | { | |
239 | size_t sz, count; | |
240 | const __be16 *val = of_find_property_value_of_size(np, propname, | |
241 | (sz_min * sizeof(*out_values)), | |
242 | (sz_max * sizeof(*out_values)), | |
243 | &sz); | |
244 | ||
245 | if (IS_ERR(val)) | |
246 | return PTR_ERR(val); | |
247 | ||
248 | if (!sz_max) | |
249 | sz = sz_min; | |
250 | else | |
251 | sz /= sizeof(*out_values); | |
252 | ||
253 | count = sz; | |
254 | while (count--) | |
255 | *out_values++ = be16_to_cpup(val++); | |
256 | ||
257 | return sz; | |
258 | } | |
259 | EXPORT_SYMBOL_GPL(of_property_read_variable_u16_array); | |
260 | ||
261 | /** | |
262 | * of_property_read_variable_u32_array - Find and read an array of 32 bit | |
263 | * integers from a property, with bounds on the minimum and maximum array size. | |
264 | * | |
265 | * @np: device node from which the property value is to be read. | |
266 | * @propname: name of the property to be searched. | |
267 | * @out_values: pointer to return value, modified only if return value is 0. | |
268 | * @sz_min: minimum number of array elements to read | |
269 | * @sz_max: maximum number of array elements to read, if zero there is no | |
270 | * upper limit on the number of elements in the dts entry but only | |
271 | * sz_min will be read. | |
272 | * | |
273 | * Search for a property in a device node and read 32-bit value(s) from | |
274 | * it. Returns number of elements read on success, -EINVAL if the property | |
275 | * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW | |
276 | * if the property data is smaller than sz_min or longer than sz_max. | |
277 | * | |
278 | * The out_values is modified only if a valid u32 value can be decoded. | |
279 | */ | |
280 | int of_property_read_variable_u32_array(const struct device_node *np, | |
281 | const char *propname, u32 *out_values, | |
282 | size_t sz_min, size_t sz_max) | |
283 | { | |
284 | size_t sz, count; | |
285 | const __be32 *val = of_find_property_value_of_size(np, propname, | |
286 | (sz_min * sizeof(*out_values)), | |
287 | (sz_max * sizeof(*out_values)), | |
288 | &sz); | |
289 | ||
290 | if (IS_ERR(val)) | |
291 | return PTR_ERR(val); | |
292 | ||
293 | if (!sz_max) | |
294 | sz = sz_min; | |
295 | else | |
296 | sz /= sizeof(*out_values); | |
297 | ||
298 | count = sz; | |
299 | while (count--) | |
300 | *out_values++ = be32_to_cpup(val++); | |
301 | ||
302 | return sz; | |
303 | } | |
304 | EXPORT_SYMBOL_GPL(of_property_read_variable_u32_array); | |
305 | ||
306 | /** | |
307 | * of_property_read_u64 - Find and read a 64 bit integer from a property | |
308 | * @np: device node from which the property value is to be read. | |
309 | * @propname: name of the property to be searched. | |
310 | * @out_value: pointer to return value, modified only if return value is 0. | |
311 | * | |
312 | * Search for a property in a device node and read a 64-bit value from | |
313 | * it. Returns 0 on success, -EINVAL if the property does not exist, | |
314 | * -ENODATA if property does not have a value, and -EOVERFLOW if the | |
315 | * property data isn't large enough. | |
316 | * | |
317 | * The out_value is modified only if a valid u64 value can be decoded. | |
318 | */ | |
319 | int of_property_read_u64(const struct device_node *np, const char *propname, | |
320 | u64 *out_value) | |
321 | { | |
322 | const __be32 *val = of_find_property_value_of_size(np, propname, | |
323 | sizeof(*out_value), | |
324 | 0, | |
325 | NULL); | |
326 | ||
327 | if (IS_ERR(val)) | |
328 | return PTR_ERR(val); | |
329 | ||
330 | *out_value = of_read_number(val, 2); | |
331 | return 0; | |
332 | } | |
333 | EXPORT_SYMBOL_GPL(of_property_read_u64); | |
334 | ||
335 | /** | |
336 | * of_property_read_variable_u64_array - Find and read an array of 64 bit | |
337 | * integers from a property, with bounds on the minimum and maximum array size. | |
338 | * | |
339 | * @np: device node from which the property value is to be read. | |
340 | * @propname: name of the property to be searched. | |
341 | * @out_values: pointer to return value, modified only if return value is 0. | |
342 | * @sz_min: minimum number of array elements to read | |
343 | * @sz_max: maximum number of array elements to read, if zero there is no | |
344 | * upper limit on the number of elements in the dts entry but only | |
345 | * sz_min will be read. | |
346 | * | |
347 | * Search for a property in a device node and read 64-bit value(s) from | |
348 | * it. Returns number of elements read on success, -EINVAL if the property | |
349 | * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW | |
350 | * if the property data is smaller than sz_min or longer than sz_max. | |
351 | * | |
352 | * The out_values is modified only if a valid u64 value can be decoded. | |
353 | */ | |
354 | int of_property_read_variable_u64_array(const struct device_node *np, | |
355 | const char *propname, u64 *out_values, | |
356 | size_t sz_min, size_t sz_max) | |
357 | { | |
358 | size_t sz, count; | |
359 | const __be32 *val = of_find_property_value_of_size(np, propname, | |
360 | (sz_min * sizeof(*out_values)), | |
361 | (sz_max * sizeof(*out_values)), | |
362 | &sz); | |
363 | ||
364 | if (IS_ERR(val)) | |
365 | return PTR_ERR(val); | |
366 | ||
367 | if (!sz_max) | |
368 | sz = sz_min; | |
369 | else | |
370 | sz /= sizeof(*out_values); | |
371 | ||
372 | count = sz; | |
373 | while (count--) { | |
374 | *out_values++ = of_read_number(val, 2); | |
375 | val += 2; | |
376 | } | |
377 | ||
378 | return sz; | |
379 | } | |
380 | EXPORT_SYMBOL_GPL(of_property_read_variable_u64_array); | |
381 | ||
382 | /** | |
383 | * of_property_read_string - Find and read a string from a property | |
384 | * @np: device node from which the property value is to be read. | |
385 | * @propname: name of the property to be searched. | |
386 | * @out_string: pointer to null terminated return string, modified only if | |
387 | * return value is 0. | |
388 | * | |
389 | * Search for a property in a device tree node and retrieve a null | |
390 | * terminated string value (pointer to data, not a copy). Returns 0 on | |
391 | * success, -EINVAL if the property does not exist, -ENODATA if property | |
392 | * does not have a value, and -EILSEQ if the string is not null-terminated | |
393 | * within the length of the property data. | |
394 | * | |
395 | * The out_string pointer is modified only if a valid string can be decoded. | |
396 | */ | |
397 | int of_property_read_string(const struct device_node *np, const char *propname, | |
398 | const char **out_string) | |
399 | { | |
400 | const struct property *prop = of_find_property(np, propname, NULL); | |
401 | if (!prop) | |
402 | return -EINVAL; | |
403 | if (!prop->value) | |
404 | return -ENODATA; | |
405 | if (strnlen(prop->value, prop->length) >= prop->length) | |
406 | return -EILSEQ; | |
407 | *out_string = prop->value; | |
408 | return 0; | |
409 | } | |
410 | EXPORT_SYMBOL_GPL(of_property_read_string); | |
411 | ||
412 | /** | |
413 | * of_property_match_string() - Find string in a list and return index | |
414 | * @np: pointer to node containing string list property | |
415 | * @propname: string list property name | |
416 | * @string: pointer to string to search for in string list | |
417 | * | |
418 | * This function searches a string list property and returns the index | |
419 | * of a specific string value. | |
420 | */ | |
421 | int of_property_match_string(const struct device_node *np, const char *propname, | |
422 | const char *string) | |
423 | { | |
424 | const struct property *prop = of_find_property(np, propname, NULL); | |
425 | size_t l; | |
426 | int i; | |
427 | const char *p, *end; | |
428 | ||
429 | if (!prop) | |
430 | return -EINVAL; | |
431 | if (!prop->value) | |
432 | return -ENODATA; | |
433 | ||
434 | p = prop->value; | |
435 | end = p + prop->length; | |
436 | ||
437 | for (i = 0; p < end; i++, p += l) { | |
438 | l = strnlen(p, end - p) + 1; | |
439 | if (p + l > end) | |
440 | return -EILSEQ; | |
441 | pr_debug("comparing %s with %s\n", string, p); | |
442 | if (strcmp(string, p) == 0) | |
443 | return i; /* Found it; return index */ | |
444 | } | |
445 | return -ENODATA; | |
446 | } | |
447 | EXPORT_SYMBOL_GPL(of_property_match_string); | |
448 | ||
449 | /** | |
450 | * of_property_read_string_helper() - Utility helper for parsing string properties | |
451 | * @np: device node from which the property value is to be read. | |
452 | * @propname: name of the property to be searched. | |
453 | * @out_strs: output array of string pointers. | |
454 | * @sz: number of array elements to read. | |
455 | * @skip: Number of strings to skip over at beginning of list. | |
456 | * | |
457 | * Don't call this function directly. It is a utility helper for the | |
458 | * of_property_read_string*() family of functions. | |
459 | */ | |
460 | int of_property_read_string_helper(const struct device_node *np, | |
461 | const char *propname, const char **out_strs, | |
462 | size_t sz, int skip) | |
463 | { | |
464 | const struct property *prop = of_find_property(np, propname, NULL); | |
465 | int l = 0, i = 0; | |
466 | const char *p, *end; | |
467 | ||
468 | if (!prop) | |
469 | return -EINVAL; | |
470 | if (!prop->value) | |
471 | return -ENODATA; | |
472 | p = prop->value; | |
473 | end = p + prop->length; | |
474 | ||
475 | for (i = 0; p < end && (!out_strs || i < skip + sz); i++, p += l) { | |
476 | l = strnlen(p, end - p) + 1; | |
477 | if (p + l > end) | |
478 | return -EILSEQ; | |
479 | if (out_strs && i >= skip) | |
480 | *out_strs++ = p; | |
481 | } | |
482 | i -= skip; | |
483 | return i <= 0 ? -ENODATA : i; | |
484 | } | |
485 | EXPORT_SYMBOL_GPL(of_property_read_string_helper); | |
486 | ||
487 | const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur, | |
488 | u32 *pu) | |
489 | { | |
490 | const void *curv = cur; | |
491 | ||
492 | if (!prop) | |
493 | return NULL; | |
494 | ||
495 | if (!cur) { | |
496 | curv = prop->value; | |
497 | goto out_val; | |
498 | } | |
499 | ||
500 | curv += sizeof(*cur); | |
501 | if (curv >= prop->value + prop->length) | |
502 | return NULL; | |
503 | ||
504 | out_val: | |
505 | *pu = be32_to_cpup(curv); | |
506 | return curv; | |
507 | } | |
508 | EXPORT_SYMBOL_GPL(of_prop_next_u32); | |
509 | ||
510 | const char *of_prop_next_string(struct property *prop, const char *cur) | |
511 | { | |
512 | const void *curv = cur; | |
513 | ||
514 | if (!prop) | |
515 | return NULL; | |
516 | ||
517 | if (!cur) | |
518 | return prop->value; | |
519 | ||
520 | curv += strlen(cur) + 1; | |
521 | if (curv >= prop->value + prop->length) | |
522 | return NULL; | |
523 | ||
524 | return curv; | |
525 | } | |
526 | EXPORT_SYMBOL_GPL(of_prop_next_string); | |
527 | ||
528 | /** | |
529 | * of_graph_parse_endpoint() - parse common endpoint node properties | |
530 | * @node: pointer to endpoint device_node | |
531 | * @endpoint: pointer to the OF endpoint data structure | |
532 | * | |
533 | * The caller should hold a reference to @node. | |
534 | */ | |
535 | int of_graph_parse_endpoint(const struct device_node *node, | |
536 | struct of_endpoint *endpoint) | |
537 | { | |
538 | struct device_node *port_node = of_get_parent(node); | |
539 | ||
0d638a07 RH |
540 | WARN_ONCE(!port_node, "%s(): endpoint %pOF has no parent node\n", |
541 | __func__, node); | |
1df09bc6 SA |
542 | |
543 | memset(endpoint, 0, sizeof(*endpoint)); | |
544 | ||
545 | endpoint->local_node = node; | |
546 | /* | |
547 | * It doesn't matter whether the two calls below succeed. | |
548 | * If they don't then the default value 0 is used. | |
549 | */ | |
550 | of_property_read_u32(port_node, "reg", &endpoint->port); | |
551 | of_property_read_u32(node, "reg", &endpoint->id); | |
552 | ||
553 | of_node_put(port_node); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | EXPORT_SYMBOL(of_graph_parse_endpoint); | |
558 | ||
559 | /** | |
560 | * of_graph_get_port_by_id() - get the port matching a given id | |
561 | * @parent: pointer to the parent device node | |
562 | * @id: id of the port | |
563 | * | |
564 | * Return: A 'port' node pointer with refcount incremented. The caller | |
565 | * has to use of_node_put() on it when done. | |
566 | */ | |
567 | struct device_node *of_graph_get_port_by_id(struct device_node *parent, u32 id) | |
568 | { | |
569 | struct device_node *node, *port; | |
570 | ||
571 | node = of_get_child_by_name(parent, "ports"); | |
572 | if (node) | |
573 | parent = node; | |
574 | ||
575 | for_each_child_of_node(parent, port) { | |
576 | u32 port_id = 0; | |
577 | ||
578 | if (of_node_cmp(port->name, "port") != 0) | |
579 | continue; | |
580 | of_property_read_u32(port, "reg", &port_id); | |
581 | if (id == port_id) | |
582 | break; | |
583 | } | |
584 | ||
585 | of_node_put(node); | |
586 | ||
587 | return port; | |
588 | } | |
589 | EXPORT_SYMBOL(of_graph_get_port_by_id); | |
590 | ||
591 | /** | |
592 | * of_graph_get_next_endpoint() - get next endpoint node | |
593 | * @parent: pointer to the parent device node | |
594 | * @prev: previous endpoint node, or NULL to get first | |
595 | * | |
596 | * Return: An 'endpoint' node pointer with refcount incremented. Refcount | |
597 | * of the passed @prev node is decremented. | |
598 | */ | |
599 | struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, | |
600 | struct device_node *prev) | |
601 | { | |
602 | struct device_node *endpoint; | |
603 | struct device_node *port; | |
604 | ||
605 | if (!parent) | |
606 | return NULL; | |
607 | ||
608 | /* | |
609 | * Start by locating the port node. If no previous endpoint is specified | |
610 | * search for the first port node, otherwise get the previous endpoint | |
611 | * parent port node. | |
612 | */ | |
613 | if (!prev) { | |
614 | struct device_node *node; | |
615 | ||
616 | node = of_get_child_by_name(parent, "ports"); | |
617 | if (node) | |
618 | parent = node; | |
619 | ||
620 | port = of_get_child_by_name(parent, "port"); | |
621 | of_node_put(node); | |
622 | ||
623 | if (!port) { | |
0d638a07 | 624 | pr_err("graph: no port node found in %pOF\n", parent); |
1df09bc6 SA |
625 | return NULL; |
626 | } | |
627 | } else { | |
628 | port = of_get_parent(prev); | |
0d638a07 RH |
629 | if (WARN_ONCE(!port, "%s(): endpoint %pOF has no parent node\n", |
630 | __func__, prev)) | |
1df09bc6 SA |
631 | return NULL; |
632 | } | |
633 | ||
634 | while (1) { | |
635 | /* | |
636 | * Now that we have a port node, get the next endpoint by | |
637 | * getting the next child. If the previous endpoint is NULL this | |
638 | * will return the first child. | |
639 | */ | |
640 | endpoint = of_get_next_child(port, prev); | |
641 | if (endpoint) { | |
642 | of_node_put(port); | |
643 | return endpoint; | |
644 | } | |
645 | ||
646 | /* No more endpoints under this port, try the next one. */ | |
647 | prev = NULL; | |
648 | ||
649 | do { | |
650 | port = of_get_next_child(parent, port); | |
651 | if (!port) | |
652 | return NULL; | |
653 | } while (of_node_cmp(port->name, "port")); | |
654 | } | |
655 | } | |
656 | EXPORT_SYMBOL(of_graph_get_next_endpoint); | |
657 | ||
658 | /** | |
659 | * of_graph_get_endpoint_by_regs() - get endpoint node of specific identifiers | |
660 | * @parent: pointer to the parent device node | |
661 | * @port_reg: identifier (value of reg property) of the parent port node | |
662 | * @reg: identifier (value of reg property) of the endpoint node | |
663 | * | |
664 | * Return: An 'endpoint' node pointer which is identified by reg and at the same | |
665 | * is the child of a port node identified by port_reg. reg and port_reg are | |
666 | * ignored when they are -1. | |
667 | */ | |
668 | struct device_node *of_graph_get_endpoint_by_regs( | |
669 | const struct device_node *parent, int port_reg, int reg) | |
670 | { | |
671 | struct of_endpoint endpoint; | |
672 | struct device_node *node = NULL; | |
673 | ||
674 | for_each_endpoint_of_node(parent, node) { | |
675 | of_graph_parse_endpoint(node, &endpoint); | |
676 | if (((port_reg == -1) || (endpoint.port == port_reg)) && | |
677 | ((reg == -1) || (endpoint.id == reg))) | |
678 | return node; | |
679 | } | |
680 | ||
681 | return NULL; | |
682 | } | |
683 | EXPORT_SYMBOL(of_graph_get_endpoint_by_regs); | |
684 | ||
b8ba92b1 RH |
685 | /** |
686 | * of_graph_get_remote_endpoint() - get remote endpoint node | |
687 | * @node: pointer to a local endpoint device_node | |
688 | * | |
689 | * Return: Remote endpoint node associated with remote endpoint node linked | |
690 | * to @node. Use of_node_put() on it when done. | |
691 | */ | |
692 | struct device_node *of_graph_get_remote_endpoint(const struct device_node *node) | |
693 | { | |
694 | /* Get remote endpoint node. */ | |
695 | return of_parse_phandle(node, "remote-endpoint", 0); | |
696 | } | |
697 | EXPORT_SYMBOL(of_graph_get_remote_endpoint); | |
698 | ||
699 | /** | |
700 | * of_graph_get_port_parent() - get port's parent node | |
701 | * @node: pointer to a local endpoint device_node | |
702 | * | |
703 | * Return: device node associated with endpoint node linked | |
704 | * to @node. Use of_node_put() on it when done. | |
705 | */ | |
706 | struct device_node *of_graph_get_port_parent(struct device_node *node) | |
707 | { | |
708 | unsigned int depth; | |
709 | ||
710 | /* Walk 3 levels up only if there is 'ports' node. */ | |
711 | for (depth = 3; depth && node; depth--) { | |
712 | node = of_get_next_parent(node); | |
713 | if (depth == 2 && of_node_cmp(node->name, "ports")) | |
714 | break; | |
715 | } | |
716 | return node; | |
717 | } | |
718 | EXPORT_SYMBOL(of_graph_get_port_parent); | |
719 | ||
1df09bc6 SA |
720 | /** |
721 | * of_graph_get_remote_port_parent() - get remote port's parent node | |
722 | * @node: pointer to a local endpoint device_node | |
723 | * | |
724 | * Return: Remote device node associated with remote endpoint node linked | |
725 | * to @node. Use of_node_put() on it when done. | |
726 | */ | |
727 | struct device_node *of_graph_get_remote_port_parent( | |
728 | const struct device_node *node) | |
729 | { | |
730 | struct device_node *np; | |
1df09bc6 SA |
731 | |
732 | /* Get remote endpoint node. */ | |
b8ba92b1 | 733 | np = of_graph_get_remote_endpoint(node); |
1df09bc6 | 734 | |
b8ba92b1 | 735 | return of_graph_get_port_parent(np); |
1df09bc6 SA |
736 | } |
737 | EXPORT_SYMBOL(of_graph_get_remote_port_parent); | |
738 | ||
739 | /** | |
740 | * of_graph_get_remote_port() - get remote port node | |
741 | * @node: pointer to a local endpoint device_node | |
742 | * | |
743 | * Return: Remote port node associated with remote endpoint node linked | |
744 | * to @node. Use of_node_put() on it when done. | |
745 | */ | |
746 | struct device_node *of_graph_get_remote_port(const struct device_node *node) | |
747 | { | |
748 | struct device_node *np; | |
749 | ||
750 | /* Get remote endpoint node. */ | |
b8ba92b1 | 751 | np = of_graph_get_remote_endpoint(node); |
1df09bc6 SA |
752 | if (!np) |
753 | return NULL; | |
754 | return of_get_next_parent(np); | |
755 | } | |
756 | EXPORT_SYMBOL(of_graph_get_remote_port); | |
757 | ||
b8ba92b1 RH |
758 | int of_graph_get_endpoint_count(const struct device_node *np) |
759 | { | |
760 | struct device_node *endpoint; | |
761 | int num = 0; | |
762 | ||
763 | for_each_endpoint_of_node(np, endpoint) | |
764 | num++; | |
765 | ||
766 | return num; | |
767 | } | |
768 | EXPORT_SYMBOL(of_graph_get_endpoint_count); | |
769 | ||
1df09bc6 SA |
770 | /** |
771 | * of_graph_get_remote_node() - get remote parent device_node for given port/endpoint | |
772 | * @node: pointer to parent device_node containing graph port/endpoint | |
773 | * @port: identifier (value of reg property) of the parent port node | |
774 | * @endpoint: identifier (value of reg property) of the endpoint node | |
775 | * | |
776 | * Return: Remote device node associated with remote endpoint node linked | |
777 | * to @node. Use of_node_put() on it when done. | |
778 | */ | |
779 | struct device_node *of_graph_get_remote_node(const struct device_node *node, | |
780 | u32 port, u32 endpoint) | |
781 | { | |
782 | struct device_node *endpoint_node, *remote; | |
783 | ||
784 | endpoint_node = of_graph_get_endpoint_by_regs(node, port, endpoint); | |
785 | if (!endpoint_node) { | |
0d638a07 RH |
786 | pr_debug("no valid endpoint (%d, %d) for node %pOF\n", |
787 | port, endpoint, node); | |
1df09bc6 SA |
788 | return NULL; |
789 | } | |
790 | ||
791 | remote = of_graph_get_remote_port_parent(endpoint_node); | |
792 | of_node_put(endpoint_node); | |
793 | if (!remote) { | |
794 | pr_debug("no valid remote node\n"); | |
795 | return NULL; | |
796 | } | |
797 | ||
798 | if (!of_device_is_available(remote)) { | |
799 | pr_debug("not available for remote node\n"); | |
800 | return NULL; | |
801 | } | |
802 | ||
803 | return remote; | |
804 | } | |
805 | EXPORT_SYMBOL(of_graph_get_remote_node); | |
3708184a SA |
806 | |
807 | static void of_fwnode_get(struct fwnode_handle *fwnode) | |
808 | { | |
809 | of_node_get(to_of_node(fwnode)); | |
810 | } | |
811 | ||
812 | static void of_fwnode_put(struct fwnode_handle *fwnode) | |
813 | { | |
814 | of_node_put(to_of_node(fwnode)); | |
815 | } | |
816 | ||
2294b3af SA |
817 | static bool of_fwnode_device_is_available(struct fwnode_handle *fwnode) |
818 | { | |
819 | return of_device_is_available(to_of_node(fwnode)); | |
820 | } | |
821 | ||
3708184a SA |
822 | static bool of_fwnode_property_present(struct fwnode_handle *fwnode, |
823 | const char *propname) | |
824 | { | |
825 | return of_property_read_bool(to_of_node(fwnode), propname); | |
826 | } | |
827 | ||
828 | static int of_fwnode_property_read_int_array(struct fwnode_handle *fwnode, | |
829 | const char *propname, | |
830 | unsigned int elem_size, void *val, | |
831 | size_t nval) | |
832 | { | |
833 | struct device_node *node = to_of_node(fwnode); | |
834 | ||
835 | if (!val) | |
836 | return of_property_count_elems_of_size(node, propname, | |
837 | elem_size); | |
838 | ||
839 | switch (elem_size) { | |
840 | case sizeof(u8): | |
841 | return of_property_read_u8_array(node, propname, val, nval); | |
842 | case sizeof(u16): | |
843 | return of_property_read_u16_array(node, propname, val, nval); | |
844 | case sizeof(u32): | |
845 | return of_property_read_u32_array(node, propname, val, nval); | |
846 | case sizeof(u64): | |
847 | return of_property_read_u64_array(node, propname, val, nval); | |
848 | } | |
849 | ||
850 | return -ENXIO; | |
851 | } | |
852 | ||
853 | static int of_fwnode_property_read_string_array(struct fwnode_handle *fwnode, | |
854 | const char *propname, | |
855 | const char **val, size_t nval) | |
856 | { | |
857 | struct device_node *node = to_of_node(fwnode); | |
858 | ||
859 | return val ? | |
860 | of_property_read_string_array(node, propname, val, nval) : | |
861 | of_property_count_strings(node, propname); | |
862 | } | |
863 | ||
864 | static struct fwnode_handle *of_fwnode_get_parent(struct fwnode_handle *fwnode) | |
865 | { | |
866 | return of_fwnode_handle(of_get_parent(to_of_node(fwnode))); | |
867 | } | |
868 | ||
869 | static struct fwnode_handle * | |
870 | of_fwnode_get_next_child_node(struct fwnode_handle *fwnode, | |
871 | struct fwnode_handle *child) | |
872 | { | |
873 | return of_fwnode_handle(of_get_next_available_child(to_of_node(fwnode), | |
874 | to_of_node(child))); | |
875 | } | |
876 | ||
877 | static struct fwnode_handle * | |
878 | of_fwnode_get_named_child_node(struct fwnode_handle *fwnode, | |
879 | const char *childname) | |
880 | { | |
881 | struct device_node *node = to_of_node(fwnode); | |
882 | struct device_node *child; | |
883 | ||
884 | for_each_available_child_of_node(node, child) | |
885 | if (!of_node_cmp(child->name, childname)) | |
886 | return of_fwnode_handle(child); | |
887 | ||
888 | return NULL; | |
889 | } | |
890 | ||
3b27d00e SA |
891 | static struct fwnode_handle * |
892 | of_fwnode_graph_get_next_endpoint(struct fwnode_handle *fwnode, | |
893 | struct fwnode_handle *prev) | |
894 | { | |
895 | return of_fwnode_handle(of_graph_get_next_endpoint(to_of_node(fwnode), | |
896 | to_of_node(prev))); | |
897 | } | |
898 | ||
899 | static struct fwnode_handle * | |
900 | of_fwnode_graph_get_remote_endpoint(struct fwnode_handle *fwnode) | |
901 | { | |
902 | return of_fwnode_handle(of_parse_phandle(to_of_node(fwnode), | |
903 | "remote-endpoint", 0)); | |
904 | } | |
905 | ||
906 | static struct fwnode_handle * | |
907 | of_fwnode_graph_get_port_parent(struct fwnode_handle *fwnode) | |
908 | { | |
909 | struct device_node *np; | |
910 | ||
911 | /* Get the parent of the port */ | |
912 | np = of_get_next_parent(to_of_node(fwnode)); | |
913 | if (!np) | |
914 | return NULL; | |
915 | ||
916 | /* Is this the "ports" node? If not, it's the port parent. */ | |
917 | if (of_node_cmp(np->name, "ports")) | |
918 | return of_fwnode_handle(np); | |
919 | ||
920 | return of_fwnode_handle(of_get_next_parent(np)); | |
921 | } | |
922 | ||
923 | static int of_fwnode_graph_parse_endpoint(struct fwnode_handle *fwnode, | |
924 | struct fwnode_endpoint *endpoint) | |
925 | { | |
926 | struct device_node *node = to_of_node(fwnode); | |
927 | struct device_node *port_node = of_get_parent(node); | |
928 | ||
929 | endpoint->local_fwnode = fwnode; | |
930 | ||
931 | of_property_read_u32(port_node, "reg", &endpoint->port); | |
932 | of_property_read_u32(node, "reg", &endpoint->id); | |
933 | ||
934 | of_node_put(port_node); | |
935 | ||
936 | return 0; | |
937 | } | |
938 | ||
3708184a SA |
939 | const struct fwnode_operations of_fwnode_ops = { |
940 | .get = of_fwnode_get, | |
941 | .put = of_fwnode_put, | |
2294b3af | 942 | .device_is_available = of_fwnode_device_is_available, |
3708184a SA |
943 | .property_present = of_fwnode_property_present, |
944 | .property_read_int_array = of_fwnode_property_read_int_array, | |
945 | .property_read_string_array = of_fwnode_property_read_string_array, | |
946 | .get_parent = of_fwnode_get_parent, | |
947 | .get_next_child_node = of_fwnode_get_next_child_node, | |
948 | .get_named_child_node = of_fwnode_get_named_child_node, | |
3b27d00e SA |
949 | .graph_get_next_endpoint = of_fwnode_graph_get_next_endpoint, |
950 | .graph_get_remote_endpoint = of_fwnode_graph_get_remote_endpoint, | |
951 | .graph_get_port_parent = of_fwnode_graph_get_port_parent, | |
952 | .graph_parse_endpoint = of_fwnode_graph_parse_endpoint, | |
3708184a | 953 | }; |