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af6074fc | 1 | // SPDX-License-Identifier: GPL-2.0+ |
1df09bc6 SA |
2 | /* |
3 | * drivers/of/property.c - Procedures for accessing and interpreting | |
4 | * Devicetree properties and graphs. | |
5 | * | |
6 | * Initially created by copying procedures from drivers/of/base.c. This | |
7 | * file contains the OF property as well as the OF graph interface | |
8 | * functions. | |
9 | * | |
10 | * Paul Mackerras August 1996. | |
11 | * Copyright (C) 1996-2005 Paul Mackerras. | |
12 | * | |
13 | * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. | |
14 | * {engebret|bergner}@us.ibm.com | |
15 | * | |
16 | * Adapted for sparc and sparc64 by David S. Miller davem@davemloft.net | |
17 | * | |
18 | * Reconsolidated from arch/x/kernel/prom.c by Stephen Rothwell and | |
19 | * Grant Likely. | |
1df09bc6 SA |
20 | */ |
21 | ||
22 | #define pr_fmt(fmt) "OF: " fmt | |
23 | ||
24 | #include <linux/of.h> | |
8c756a0a | 25 | #include <linux/of_address.h> |
1df09bc6 SA |
26 | #include <linux/of_device.h> |
27 | #include <linux/of_graph.h> | |
4104ca77 | 28 | #include <linux/of_irq.h> |
1df09bc6 | 29 | #include <linux/string.h> |
a3e1d1a7 | 30 | #include <linux/moduleparam.h> |
1df09bc6 SA |
31 | |
32 | #include "of_private.h" | |
33 | ||
4ec0a44b DO |
34 | /** |
35 | * of_graph_is_present() - check graph's presence | |
36 | * @node: pointer to device_node containing graph port | |
37 | * | |
38 | * Return: True if @node has a port or ports (with a port) sub-node, | |
39 | * false otherwise. | |
40 | */ | |
41 | bool of_graph_is_present(const struct device_node *node) | |
42 | { | |
43 | struct device_node *ports, *port; | |
44 | ||
45 | ports = of_get_child_by_name(node, "ports"); | |
46 | if (ports) | |
47 | node = ports; | |
48 | ||
49 | port = of_get_child_by_name(node, "port"); | |
50 | of_node_put(ports); | |
51 | of_node_put(port); | |
52 | ||
53 | return !!port; | |
54 | } | |
55 | EXPORT_SYMBOL(of_graph_is_present); | |
56 | ||
1df09bc6 SA |
57 | /** |
58 | * of_property_count_elems_of_size - Count the number of elements in a property | |
59 | * | |
60 | * @np: device node from which the property value is to be read. | |
61 | * @propname: name of the property to be searched. | |
62 | * @elem_size: size of the individual element | |
63 | * | |
64 | * Search for a property in a device node and count the number of elements of | |
8c8239c2 RH |
65 | * size elem_size in it. |
66 | * | |
67 | * Return: The number of elements on sucess, -EINVAL if the property does not | |
68 | * exist or its length does not match a multiple of elem_size and -ENODATA if | |
69 | * the property does not have a value. | |
1df09bc6 SA |
70 | */ |
71 | int of_property_count_elems_of_size(const struct device_node *np, | |
72 | const char *propname, int elem_size) | |
73 | { | |
74 | struct property *prop = of_find_property(np, propname, NULL); | |
75 | ||
76 | if (!prop) | |
77 | return -EINVAL; | |
78 | if (!prop->value) | |
79 | return -ENODATA; | |
80 | ||
81 | if (prop->length % elem_size != 0) { | |
0d638a07 RH |
82 | pr_err("size of %s in node %pOF is not a multiple of %d\n", |
83 | propname, np, elem_size); | |
1df09bc6 SA |
84 | return -EINVAL; |
85 | } | |
86 | ||
87 | return prop->length / elem_size; | |
88 | } | |
89 | EXPORT_SYMBOL_GPL(of_property_count_elems_of_size); | |
90 | ||
91 | /** | |
92 | * of_find_property_value_of_size | |
93 | * | |
94 | * @np: device node from which the property value is to be read. | |
95 | * @propname: name of the property to be searched. | |
96 | * @min: minimum allowed length of property value | |
97 | * @max: maximum allowed length of property value (0 means unlimited) | |
98 | * @len: if !=NULL, actual length is written to here | |
99 | * | |
100 | * Search for a property in a device node and valid the requested size. | |
8c8239c2 RH |
101 | * |
102 | * Return: The property value on success, -EINVAL if the property does not | |
103 | * exist, -ENODATA if property does not have a value, and -EOVERFLOW if the | |
1df09bc6 SA |
104 | * property data is too small or too large. |
105 | * | |
106 | */ | |
107 | static void *of_find_property_value_of_size(const struct device_node *np, | |
108 | const char *propname, u32 min, u32 max, size_t *len) | |
109 | { | |
110 | struct property *prop = of_find_property(np, propname, NULL); | |
111 | ||
112 | if (!prop) | |
113 | return ERR_PTR(-EINVAL); | |
114 | if (!prop->value) | |
115 | return ERR_PTR(-ENODATA); | |
116 | if (prop->length < min) | |
117 | return ERR_PTR(-EOVERFLOW); | |
118 | if (max && prop->length > max) | |
119 | return ERR_PTR(-EOVERFLOW); | |
120 | ||
121 | if (len) | |
122 | *len = prop->length; | |
123 | ||
124 | return prop->value; | |
125 | } | |
126 | ||
127 | /** | |
128 | * of_property_read_u32_index - Find and read a u32 from a multi-value property. | |
129 | * | |
130 | * @np: device node from which the property value is to be read. | |
131 | * @propname: name of the property to be searched. | |
132 | * @index: index of the u32 in the list of values | |
133 | * @out_value: pointer to return value, modified only if no error. | |
134 | * | |
135 | * Search for a property in a device node and read nth 32-bit value from | |
8c8239c2 RH |
136 | * it. |
137 | * | |
138 | * Return: 0 on success, -EINVAL if the property does not exist, | |
1df09bc6 SA |
139 | * -ENODATA if property does not have a value, and -EOVERFLOW if the |
140 | * property data isn't large enough. | |
141 | * | |
142 | * The out_value is modified only if a valid u32 value can be decoded. | |
143 | */ | |
144 | int of_property_read_u32_index(const struct device_node *np, | |
145 | const char *propname, | |
146 | u32 index, u32 *out_value) | |
147 | { | |
148 | const u32 *val = of_find_property_value_of_size(np, propname, | |
149 | ((index + 1) * sizeof(*out_value)), | |
150 | 0, | |
151 | NULL); | |
152 | ||
153 | if (IS_ERR(val)) | |
154 | return PTR_ERR(val); | |
155 | ||
156 | *out_value = be32_to_cpup(((__be32 *)val) + index); | |
157 | return 0; | |
158 | } | |
159 | EXPORT_SYMBOL_GPL(of_property_read_u32_index); | |
160 | ||
161 | /** | |
162 | * of_property_read_u64_index - Find and read a u64 from a multi-value property. | |
163 | * | |
164 | * @np: device node from which the property value is to be read. | |
165 | * @propname: name of the property to be searched. | |
166 | * @index: index of the u64 in the list of values | |
167 | * @out_value: pointer to return value, modified only if no error. | |
168 | * | |
169 | * Search for a property in a device node and read nth 64-bit value from | |
8c8239c2 RH |
170 | * it. |
171 | * | |
172 | * Return: 0 on success, -EINVAL if the property does not exist, | |
1df09bc6 SA |
173 | * -ENODATA if property does not have a value, and -EOVERFLOW if the |
174 | * property data isn't large enough. | |
175 | * | |
176 | * The out_value is modified only if a valid u64 value can be decoded. | |
177 | */ | |
178 | int of_property_read_u64_index(const struct device_node *np, | |
179 | const char *propname, | |
180 | u32 index, u64 *out_value) | |
181 | { | |
182 | const u64 *val = of_find_property_value_of_size(np, propname, | |
183 | ((index + 1) * sizeof(*out_value)), | |
184 | 0, NULL); | |
185 | ||
186 | if (IS_ERR(val)) | |
187 | return PTR_ERR(val); | |
188 | ||
189 | *out_value = be64_to_cpup(((__be64 *)val) + index); | |
190 | return 0; | |
191 | } | |
192 | EXPORT_SYMBOL_GPL(of_property_read_u64_index); | |
193 | ||
194 | /** | |
195 | * of_property_read_variable_u8_array - Find and read an array of u8 from a | |
196 | * property, with bounds on the minimum and maximum array size. | |
197 | * | |
198 | * @np: device node from which the property value is to be read. | |
199 | * @propname: name of the property to be searched. | |
7f3fefee | 200 | * @out_values: pointer to found values. |
1df09bc6 SA |
201 | * @sz_min: minimum number of array elements to read |
202 | * @sz_max: maximum number of array elements to read, if zero there is no | |
203 | * upper limit on the number of elements in the dts entry but only | |
204 | * sz_min will be read. | |
205 | * | |
206 | * Search for a property in a device node and read 8-bit value(s) from | |
8c8239c2 | 207 | * it. |
1df09bc6 SA |
208 | * |
209 | * dts entry of array should be like: | |
8c8239c2 RH |
210 | * ``property = /bits/ 8 <0x50 0x60 0x70>;`` |
211 | * | |
212 | * Return: The number of elements read on success, -EINVAL if the property | |
213 | * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW | |
214 | * if the property data is smaller than sz_min or longer than sz_max. | |
1df09bc6 SA |
215 | * |
216 | * The out_values is modified only if a valid u8 value can be decoded. | |
217 | */ | |
218 | int of_property_read_variable_u8_array(const struct device_node *np, | |
219 | const char *propname, u8 *out_values, | |
220 | size_t sz_min, size_t sz_max) | |
221 | { | |
222 | size_t sz, count; | |
223 | const u8 *val = of_find_property_value_of_size(np, propname, | |
224 | (sz_min * sizeof(*out_values)), | |
225 | (sz_max * sizeof(*out_values)), | |
226 | &sz); | |
227 | ||
228 | if (IS_ERR(val)) | |
229 | return PTR_ERR(val); | |
230 | ||
231 | if (!sz_max) | |
232 | sz = sz_min; | |
233 | else | |
234 | sz /= sizeof(*out_values); | |
235 | ||
236 | count = sz; | |
237 | while (count--) | |
238 | *out_values++ = *val++; | |
239 | ||
240 | return sz; | |
241 | } | |
242 | EXPORT_SYMBOL_GPL(of_property_read_variable_u8_array); | |
243 | ||
244 | /** | |
245 | * of_property_read_variable_u16_array - Find and read an array of u16 from a | |
246 | * property, with bounds on the minimum and maximum array size. | |
247 | * | |
248 | * @np: device node from which the property value is to be read. | |
249 | * @propname: name of the property to be searched. | |
7f3fefee | 250 | * @out_values: pointer to found values. |
1df09bc6 SA |
251 | * @sz_min: minimum number of array elements to read |
252 | * @sz_max: maximum number of array elements to read, if zero there is no | |
253 | * upper limit on the number of elements in the dts entry but only | |
254 | * sz_min will be read. | |
255 | * | |
256 | * Search for a property in a device node and read 16-bit value(s) from | |
8c8239c2 | 257 | * it. |
1df09bc6 SA |
258 | * |
259 | * dts entry of array should be like: | |
8c8239c2 RH |
260 | * ``property = /bits/ 16 <0x5000 0x6000 0x7000>;`` |
261 | * | |
262 | * Return: The number of elements read on success, -EINVAL if the property | |
263 | * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW | |
264 | * if the property data is smaller than sz_min or longer than sz_max. | |
1df09bc6 SA |
265 | * |
266 | * The out_values is modified only if a valid u16 value can be decoded. | |
267 | */ | |
268 | int of_property_read_variable_u16_array(const struct device_node *np, | |
269 | const char *propname, u16 *out_values, | |
270 | size_t sz_min, size_t sz_max) | |
271 | { | |
272 | size_t sz, count; | |
273 | const __be16 *val = of_find_property_value_of_size(np, propname, | |
274 | (sz_min * sizeof(*out_values)), | |
275 | (sz_max * sizeof(*out_values)), | |
276 | &sz); | |
277 | ||
278 | if (IS_ERR(val)) | |
279 | return PTR_ERR(val); | |
280 | ||
281 | if (!sz_max) | |
282 | sz = sz_min; | |
283 | else | |
284 | sz /= sizeof(*out_values); | |
285 | ||
286 | count = sz; | |
287 | while (count--) | |
288 | *out_values++ = be16_to_cpup(val++); | |
289 | ||
290 | return sz; | |
291 | } | |
292 | EXPORT_SYMBOL_GPL(of_property_read_variable_u16_array); | |
293 | ||
294 | /** | |
295 | * of_property_read_variable_u32_array - Find and read an array of 32 bit | |
296 | * integers from a property, with bounds on the minimum and maximum array size. | |
297 | * | |
298 | * @np: device node from which the property value is to be read. | |
299 | * @propname: name of the property to be searched. | |
7f3fefee | 300 | * @out_values: pointer to return found values. |
1df09bc6 SA |
301 | * @sz_min: minimum number of array elements to read |
302 | * @sz_max: maximum number of array elements to read, if zero there is no | |
303 | * upper limit on the number of elements in the dts entry but only | |
304 | * sz_min will be read. | |
305 | * | |
306 | * Search for a property in a device node and read 32-bit value(s) from | |
8c8239c2 RH |
307 | * it. |
308 | * | |
309 | * Return: The number of elements read on success, -EINVAL if the property | |
1df09bc6 SA |
310 | * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW |
311 | * if the property data is smaller than sz_min or longer than sz_max. | |
312 | * | |
313 | * The out_values is modified only if a valid u32 value can be decoded. | |
314 | */ | |
315 | int of_property_read_variable_u32_array(const struct device_node *np, | |
316 | const char *propname, u32 *out_values, | |
317 | size_t sz_min, size_t sz_max) | |
318 | { | |
319 | size_t sz, count; | |
320 | const __be32 *val = of_find_property_value_of_size(np, propname, | |
321 | (sz_min * sizeof(*out_values)), | |
322 | (sz_max * sizeof(*out_values)), | |
323 | &sz); | |
324 | ||
325 | if (IS_ERR(val)) | |
326 | return PTR_ERR(val); | |
327 | ||
328 | if (!sz_max) | |
329 | sz = sz_min; | |
330 | else | |
331 | sz /= sizeof(*out_values); | |
332 | ||
333 | count = sz; | |
334 | while (count--) | |
335 | *out_values++ = be32_to_cpup(val++); | |
336 | ||
337 | return sz; | |
338 | } | |
339 | EXPORT_SYMBOL_GPL(of_property_read_variable_u32_array); | |
340 | ||
341 | /** | |
342 | * of_property_read_u64 - Find and read a 64 bit integer from a property | |
343 | * @np: device node from which the property value is to be read. | |
344 | * @propname: name of the property to be searched. | |
345 | * @out_value: pointer to return value, modified only if return value is 0. | |
346 | * | |
347 | * Search for a property in a device node and read a 64-bit value from | |
8c8239c2 RH |
348 | * it. |
349 | * | |
350 | * Return: 0 on success, -EINVAL if the property does not exist, | |
1df09bc6 SA |
351 | * -ENODATA if property does not have a value, and -EOVERFLOW if the |
352 | * property data isn't large enough. | |
353 | * | |
354 | * The out_value is modified only if a valid u64 value can be decoded. | |
355 | */ | |
356 | int of_property_read_u64(const struct device_node *np, const char *propname, | |
357 | u64 *out_value) | |
358 | { | |
359 | const __be32 *val = of_find_property_value_of_size(np, propname, | |
360 | sizeof(*out_value), | |
361 | 0, | |
362 | NULL); | |
363 | ||
364 | if (IS_ERR(val)) | |
365 | return PTR_ERR(val); | |
366 | ||
367 | *out_value = of_read_number(val, 2); | |
368 | return 0; | |
369 | } | |
370 | EXPORT_SYMBOL_GPL(of_property_read_u64); | |
371 | ||
372 | /** | |
373 | * of_property_read_variable_u64_array - Find and read an array of 64 bit | |
374 | * integers from a property, with bounds on the minimum and maximum array size. | |
375 | * | |
376 | * @np: device node from which the property value is to be read. | |
377 | * @propname: name of the property to be searched. | |
7f3fefee | 378 | * @out_values: pointer to found values. |
1df09bc6 SA |
379 | * @sz_min: minimum number of array elements to read |
380 | * @sz_max: maximum number of array elements to read, if zero there is no | |
381 | * upper limit on the number of elements in the dts entry but only | |
382 | * sz_min will be read. | |
383 | * | |
384 | * Search for a property in a device node and read 64-bit value(s) from | |
8c8239c2 RH |
385 | * it. |
386 | * | |
387 | * Return: The number of elements read on success, -EINVAL if the property | |
1df09bc6 SA |
388 | * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW |
389 | * if the property data is smaller than sz_min or longer than sz_max. | |
390 | * | |
391 | * The out_values is modified only if a valid u64 value can be decoded. | |
392 | */ | |
393 | int of_property_read_variable_u64_array(const struct device_node *np, | |
394 | const char *propname, u64 *out_values, | |
395 | size_t sz_min, size_t sz_max) | |
396 | { | |
397 | size_t sz, count; | |
398 | const __be32 *val = of_find_property_value_of_size(np, propname, | |
399 | (sz_min * sizeof(*out_values)), | |
400 | (sz_max * sizeof(*out_values)), | |
401 | &sz); | |
402 | ||
403 | if (IS_ERR(val)) | |
404 | return PTR_ERR(val); | |
405 | ||
406 | if (!sz_max) | |
407 | sz = sz_min; | |
408 | else | |
409 | sz /= sizeof(*out_values); | |
410 | ||
411 | count = sz; | |
412 | while (count--) { | |
413 | *out_values++ = of_read_number(val, 2); | |
414 | val += 2; | |
415 | } | |
416 | ||
417 | return sz; | |
418 | } | |
419 | EXPORT_SYMBOL_GPL(of_property_read_variable_u64_array); | |
420 | ||
421 | /** | |
422 | * of_property_read_string - Find and read a string from a property | |
423 | * @np: device node from which the property value is to be read. | |
424 | * @propname: name of the property to be searched. | |
425 | * @out_string: pointer to null terminated return string, modified only if | |
426 | * return value is 0. | |
427 | * | |
428 | * Search for a property in a device tree node and retrieve a null | |
8c8239c2 RH |
429 | * terminated string value (pointer to data, not a copy). |
430 | * | |
431 | * Return: 0 on success, -EINVAL if the property does not exist, -ENODATA if | |
432 | * property does not have a value, and -EILSEQ if the string is not | |
433 | * null-terminated within the length of the property data. | |
1df09bc6 | 434 | * |
f688d619 SS |
435 | * Note that the empty string "" has length of 1, thus -ENODATA cannot |
436 | * be interpreted as an empty string. | |
437 | * | |
1df09bc6 SA |
438 | * The out_string pointer is modified only if a valid string can be decoded. |
439 | */ | |
440 | int of_property_read_string(const struct device_node *np, const char *propname, | |
441 | const char **out_string) | |
442 | { | |
443 | const struct property *prop = of_find_property(np, propname, NULL); | |
444 | if (!prop) | |
445 | return -EINVAL; | |
f688d619 | 446 | if (!prop->length) |
1df09bc6 SA |
447 | return -ENODATA; |
448 | if (strnlen(prop->value, prop->length) >= prop->length) | |
449 | return -EILSEQ; | |
450 | *out_string = prop->value; | |
451 | return 0; | |
452 | } | |
453 | EXPORT_SYMBOL_GPL(of_property_read_string); | |
454 | ||
455 | /** | |
456 | * of_property_match_string() - Find string in a list and return index | |
457 | * @np: pointer to node containing string list property | |
458 | * @propname: string list property name | |
459 | * @string: pointer to string to search for in string list | |
460 | * | |
461 | * This function searches a string list property and returns the index | |
462 | * of a specific string value. | |
463 | */ | |
464 | int of_property_match_string(const struct device_node *np, const char *propname, | |
465 | const char *string) | |
466 | { | |
467 | const struct property *prop = of_find_property(np, propname, NULL); | |
468 | size_t l; | |
469 | int i; | |
470 | const char *p, *end; | |
471 | ||
472 | if (!prop) | |
473 | return -EINVAL; | |
474 | if (!prop->value) | |
475 | return -ENODATA; | |
476 | ||
477 | p = prop->value; | |
478 | end = p + prop->length; | |
479 | ||
480 | for (i = 0; p < end; i++, p += l) { | |
481 | l = strnlen(p, end - p) + 1; | |
482 | if (p + l > end) | |
483 | return -EILSEQ; | |
484 | pr_debug("comparing %s with %s\n", string, p); | |
485 | if (strcmp(string, p) == 0) | |
486 | return i; /* Found it; return index */ | |
487 | } | |
488 | return -ENODATA; | |
489 | } | |
490 | EXPORT_SYMBOL_GPL(of_property_match_string); | |
491 | ||
492 | /** | |
493 | * of_property_read_string_helper() - Utility helper for parsing string properties | |
494 | * @np: device node from which the property value is to be read. | |
495 | * @propname: name of the property to be searched. | |
496 | * @out_strs: output array of string pointers. | |
497 | * @sz: number of array elements to read. | |
498 | * @skip: Number of strings to skip over at beginning of list. | |
499 | * | |
500 | * Don't call this function directly. It is a utility helper for the | |
501 | * of_property_read_string*() family of functions. | |
502 | */ | |
503 | int of_property_read_string_helper(const struct device_node *np, | |
504 | const char *propname, const char **out_strs, | |
505 | size_t sz, int skip) | |
506 | { | |
507 | const struct property *prop = of_find_property(np, propname, NULL); | |
508 | int l = 0, i = 0; | |
509 | const char *p, *end; | |
510 | ||
511 | if (!prop) | |
512 | return -EINVAL; | |
513 | if (!prop->value) | |
514 | return -ENODATA; | |
515 | p = prop->value; | |
516 | end = p + prop->length; | |
517 | ||
518 | for (i = 0; p < end && (!out_strs || i < skip + sz); i++, p += l) { | |
519 | l = strnlen(p, end - p) + 1; | |
520 | if (p + l > end) | |
521 | return -EILSEQ; | |
522 | if (out_strs && i >= skip) | |
523 | *out_strs++ = p; | |
524 | } | |
525 | i -= skip; | |
526 | return i <= 0 ? -ENODATA : i; | |
527 | } | |
528 | EXPORT_SYMBOL_GPL(of_property_read_string_helper); | |
529 | ||
530 | const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur, | |
531 | u32 *pu) | |
532 | { | |
533 | const void *curv = cur; | |
534 | ||
535 | if (!prop) | |
536 | return NULL; | |
537 | ||
538 | if (!cur) { | |
539 | curv = prop->value; | |
540 | goto out_val; | |
541 | } | |
542 | ||
543 | curv += sizeof(*cur); | |
544 | if (curv >= prop->value + prop->length) | |
545 | return NULL; | |
546 | ||
547 | out_val: | |
548 | *pu = be32_to_cpup(curv); | |
549 | return curv; | |
550 | } | |
551 | EXPORT_SYMBOL_GPL(of_prop_next_u32); | |
552 | ||
553 | const char *of_prop_next_string(struct property *prop, const char *cur) | |
554 | { | |
555 | const void *curv = cur; | |
556 | ||
557 | if (!prop) | |
558 | return NULL; | |
559 | ||
560 | if (!cur) | |
561 | return prop->value; | |
562 | ||
563 | curv += strlen(cur) + 1; | |
564 | if (curv >= prop->value + prop->length) | |
565 | return NULL; | |
566 | ||
567 | return curv; | |
568 | } | |
569 | EXPORT_SYMBOL_GPL(of_prop_next_string); | |
570 | ||
571 | /** | |
572 | * of_graph_parse_endpoint() - parse common endpoint node properties | |
573 | * @node: pointer to endpoint device_node | |
574 | * @endpoint: pointer to the OF endpoint data structure | |
575 | * | |
576 | * The caller should hold a reference to @node. | |
577 | */ | |
578 | int of_graph_parse_endpoint(const struct device_node *node, | |
579 | struct of_endpoint *endpoint) | |
580 | { | |
581 | struct device_node *port_node = of_get_parent(node); | |
582 | ||
0d638a07 RH |
583 | WARN_ONCE(!port_node, "%s(): endpoint %pOF has no parent node\n", |
584 | __func__, node); | |
1df09bc6 SA |
585 | |
586 | memset(endpoint, 0, sizeof(*endpoint)); | |
587 | ||
588 | endpoint->local_node = node; | |
589 | /* | |
590 | * It doesn't matter whether the two calls below succeed. | |
591 | * If they don't then the default value 0 is used. | |
592 | */ | |
593 | of_property_read_u32(port_node, "reg", &endpoint->port); | |
594 | of_property_read_u32(node, "reg", &endpoint->id); | |
595 | ||
596 | of_node_put(port_node); | |
597 | ||
598 | return 0; | |
599 | } | |
600 | EXPORT_SYMBOL(of_graph_parse_endpoint); | |
601 | ||
602 | /** | |
603 | * of_graph_get_port_by_id() - get the port matching a given id | |
604 | * @parent: pointer to the parent device node | |
605 | * @id: id of the port | |
606 | * | |
607 | * Return: A 'port' node pointer with refcount incremented. The caller | |
608 | * has to use of_node_put() on it when done. | |
609 | */ | |
610 | struct device_node *of_graph_get_port_by_id(struct device_node *parent, u32 id) | |
611 | { | |
612 | struct device_node *node, *port; | |
613 | ||
614 | node = of_get_child_by_name(parent, "ports"); | |
615 | if (node) | |
616 | parent = node; | |
617 | ||
618 | for_each_child_of_node(parent, port) { | |
619 | u32 port_id = 0; | |
620 | ||
b3e46d1a | 621 | if (!of_node_name_eq(port, "port")) |
1df09bc6 SA |
622 | continue; |
623 | of_property_read_u32(port, "reg", &port_id); | |
624 | if (id == port_id) | |
625 | break; | |
626 | } | |
627 | ||
628 | of_node_put(node); | |
629 | ||
630 | return port; | |
631 | } | |
632 | EXPORT_SYMBOL(of_graph_get_port_by_id); | |
633 | ||
634 | /** | |
635 | * of_graph_get_next_endpoint() - get next endpoint node | |
636 | * @parent: pointer to the parent device node | |
637 | * @prev: previous endpoint node, or NULL to get first | |
638 | * | |
639 | * Return: An 'endpoint' node pointer with refcount incremented. Refcount | |
640 | * of the passed @prev node is decremented. | |
641 | */ | |
642 | struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, | |
643 | struct device_node *prev) | |
644 | { | |
645 | struct device_node *endpoint; | |
646 | struct device_node *port; | |
647 | ||
648 | if (!parent) | |
649 | return NULL; | |
650 | ||
651 | /* | |
652 | * Start by locating the port node. If no previous endpoint is specified | |
653 | * search for the first port node, otherwise get the previous endpoint | |
654 | * parent port node. | |
655 | */ | |
656 | if (!prev) { | |
657 | struct device_node *node; | |
658 | ||
659 | node = of_get_child_by_name(parent, "ports"); | |
660 | if (node) | |
661 | parent = node; | |
662 | ||
663 | port = of_get_child_by_name(parent, "port"); | |
664 | of_node_put(node); | |
665 | ||
666 | if (!port) { | |
0d638a07 | 667 | pr_err("graph: no port node found in %pOF\n", parent); |
1df09bc6 SA |
668 | return NULL; |
669 | } | |
670 | } else { | |
671 | port = of_get_parent(prev); | |
0d638a07 RH |
672 | if (WARN_ONCE(!port, "%s(): endpoint %pOF has no parent node\n", |
673 | __func__, prev)) | |
1df09bc6 SA |
674 | return NULL; |
675 | } | |
676 | ||
677 | while (1) { | |
678 | /* | |
679 | * Now that we have a port node, get the next endpoint by | |
680 | * getting the next child. If the previous endpoint is NULL this | |
681 | * will return the first child. | |
682 | */ | |
683 | endpoint = of_get_next_child(port, prev); | |
684 | if (endpoint) { | |
685 | of_node_put(port); | |
686 | return endpoint; | |
687 | } | |
688 | ||
689 | /* No more endpoints under this port, try the next one. */ | |
690 | prev = NULL; | |
691 | ||
692 | do { | |
693 | port = of_get_next_child(parent, port); | |
694 | if (!port) | |
695 | return NULL; | |
b3e46d1a | 696 | } while (!of_node_name_eq(port, "port")); |
1df09bc6 SA |
697 | } |
698 | } | |
699 | EXPORT_SYMBOL(of_graph_get_next_endpoint); | |
700 | ||
701 | /** | |
702 | * of_graph_get_endpoint_by_regs() - get endpoint node of specific identifiers | |
703 | * @parent: pointer to the parent device node | |
704 | * @port_reg: identifier (value of reg property) of the parent port node | |
705 | * @reg: identifier (value of reg property) of the endpoint node | |
706 | * | |
707 | * Return: An 'endpoint' node pointer which is identified by reg and at the same | |
708 | * is the child of a port node identified by port_reg. reg and port_reg are | |
deb387d4 | 709 | * ignored when they are -1. Use of_node_put() on the pointer when done. |
1df09bc6 SA |
710 | */ |
711 | struct device_node *of_graph_get_endpoint_by_regs( | |
712 | const struct device_node *parent, int port_reg, int reg) | |
713 | { | |
714 | struct of_endpoint endpoint; | |
715 | struct device_node *node = NULL; | |
716 | ||
717 | for_each_endpoint_of_node(parent, node) { | |
718 | of_graph_parse_endpoint(node, &endpoint); | |
719 | if (((port_reg == -1) || (endpoint.port == port_reg)) && | |
720 | ((reg == -1) || (endpoint.id == reg))) | |
721 | return node; | |
722 | } | |
723 | ||
724 | return NULL; | |
725 | } | |
726 | EXPORT_SYMBOL(of_graph_get_endpoint_by_regs); | |
727 | ||
b8ba92b1 RH |
728 | /** |
729 | * of_graph_get_remote_endpoint() - get remote endpoint node | |
730 | * @node: pointer to a local endpoint device_node | |
731 | * | |
732 | * Return: Remote endpoint node associated with remote endpoint node linked | |
733 | * to @node. Use of_node_put() on it when done. | |
734 | */ | |
735 | struct device_node *of_graph_get_remote_endpoint(const struct device_node *node) | |
736 | { | |
737 | /* Get remote endpoint node. */ | |
738 | return of_parse_phandle(node, "remote-endpoint", 0); | |
739 | } | |
740 | EXPORT_SYMBOL(of_graph_get_remote_endpoint); | |
741 | ||
742 | /** | |
743 | * of_graph_get_port_parent() - get port's parent node | |
744 | * @node: pointer to a local endpoint device_node | |
745 | * | |
746 | * Return: device node associated with endpoint node linked | |
747 | * to @node. Use of_node_put() on it when done. | |
748 | */ | |
749 | struct device_node *of_graph_get_port_parent(struct device_node *node) | |
750 | { | |
751 | unsigned int depth; | |
752 | ||
c0a480d1 TL |
753 | if (!node) |
754 | return NULL; | |
755 | ||
756 | /* | |
757 | * Preserve usecount for passed in node as of_get_next_parent() | |
758 | * will do of_node_put() on it. | |
759 | */ | |
760 | of_node_get(node); | |
761 | ||
b8ba92b1 RH |
762 | /* Walk 3 levels up only if there is 'ports' node. */ |
763 | for (depth = 3; depth && node; depth--) { | |
764 | node = of_get_next_parent(node); | |
b3e46d1a | 765 | if (depth == 2 && !of_node_name_eq(node, "ports")) |
b8ba92b1 RH |
766 | break; |
767 | } | |
768 | return node; | |
769 | } | |
770 | EXPORT_SYMBOL(of_graph_get_port_parent); | |
771 | ||
1df09bc6 SA |
772 | /** |
773 | * of_graph_get_remote_port_parent() - get remote port's parent node | |
774 | * @node: pointer to a local endpoint device_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_port_parent( | |
780 | const struct device_node *node) | |
781 | { | |
c0a480d1 | 782 | struct device_node *np, *pp; |
1df09bc6 SA |
783 | |
784 | /* Get remote endpoint node. */ | |
b8ba92b1 | 785 | np = of_graph_get_remote_endpoint(node); |
1df09bc6 | 786 | |
c0a480d1 TL |
787 | pp = of_graph_get_port_parent(np); |
788 | ||
789 | of_node_put(np); | |
790 | ||
791 | return pp; | |
1df09bc6 SA |
792 | } |
793 | EXPORT_SYMBOL(of_graph_get_remote_port_parent); | |
794 | ||
795 | /** | |
796 | * of_graph_get_remote_port() - get remote port node | |
797 | * @node: pointer to a local endpoint device_node | |
798 | * | |
799 | * Return: Remote port node associated with remote endpoint node linked | |
8c8239c2 | 800 | * to @node. Use of_node_put() on it when done. |
1df09bc6 SA |
801 | */ |
802 | struct device_node *of_graph_get_remote_port(const struct device_node *node) | |
803 | { | |
804 | struct device_node *np; | |
805 | ||
806 | /* Get remote endpoint node. */ | |
b8ba92b1 | 807 | np = of_graph_get_remote_endpoint(node); |
1df09bc6 SA |
808 | if (!np) |
809 | return NULL; | |
810 | return of_get_next_parent(np); | |
811 | } | |
812 | EXPORT_SYMBOL(of_graph_get_remote_port); | |
813 | ||
b8ba92b1 RH |
814 | int of_graph_get_endpoint_count(const struct device_node *np) |
815 | { | |
816 | struct device_node *endpoint; | |
817 | int num = 0; | |
818 | ||
819 | for_each_endpoint_of_node(np, endpoint) | |
820 | num++; | |
821 | ||
822 | return num; | |
823 | } | |
824 | EXPORT_SYMBOL(of_graph_get_endpoint_count); | |
825 | ||
1df09bc6 SA |
826 | /** |
827 | * of_graph_get_remote_node() - get remote parent device_node for given port/endpoint | |
828 | * @node: pointer to parent device_node containing graph port/endpoint | |
829 | * @port: identifier (value of reg property) of the parent port node | |
830 | * @endpoint: identifier (value of reg property) of the endpoint node | |
831 | * | |
832 | * Return: Remote device node associated with remote endpoint node linked | |
8c8239c2 | 833 | * to @node. Use of_node_put() on it when done. |
1df09bc6 SA |
834 | */ |
835 | struct device_node *of_graph_get_remote_node(const struct device_node *node, | |
836 | u32 port, u32 endpoint) | |
837 | { | |
838 | struct device_node *endpoint_node, *remote; | |
839 | ||
840 | endpoint_node = of_graph_get_endpoint_by_regs(node, port, endpoint); | |
841 | if (!endpoint_node) { | |
0d638a07 RH |
842 | pr_debug("no valid endpoint (%d, %d) for node %pOF\n", |
843 | port, endpoint, node); | |
1df09bc6 SA |
844 | return NULL; |
845 | } | |
846 | ||
847 | remote = of_graph_get_remote_port_parent(endpoint_node); | |
848 | of_node_put(endpoint_node); | |
849 | if (!remote) { | |
850 | pr_debug("no valid remote node\n"); | |
851 | return NULL; | |
852 | } | |
853 | ||
854 | if (!of_device_is_available(remote)) { | |
855 | pr_debug("not available for remote node\n"); | |
28b170e8 | 856 | of_node_put(remote); |
1df09bc6 SA |
857 | return NULL; |
858 | } | |
859 | ||
860 | return remote; | |
861 | } | |
862 | EXPORT_SYMBOL(of_graph_get_remote_node); | |
3708184a | 863 | |
cf89a31c | 864 | static struct fwnode_handle *of_fwnode_get(struct fwnode_handle *fwnode) |
3708184a | 865 | { |
cf89a31c | 866 | return of_fwnode_handle(of_node_get(to_of_node(fwnode))); |
3708184a SA |
867 | } |
868 | ||
869 | static void of_fwnode_put(struct fwnode_handle *fwnode) | |
870 | { | |
871 | of_node_put(to_of_node(fwnode)); | |
872 | } | |
873 | ||
37ba983c | 874 | static bool of_fwnode_device_is_available(const struct fwnode_handle *fwnode) |
2294b3af SA |
875 | { |
876 | return of_device_is_available(to_of_node(fwnode)); | |
877 | } | |
878 | ||
8c756a0a SA |
879 | static bool of_fwnode_device_dma_supported(const struct fwnode_handle *fwnode) |
880 | { | |
881 | return true; | |
882 | } | |
883 | ||
884 | static enum dev_dma_attr | |
885 | of_fwnode_device_get_dma_attr(const struct fwnode_handle *fwnode) | |
886 | { | |
887 | if (of_dma_is_coherent(to_of_node(fwnode))) | |
888 | return DEV_DMA_COHERENT; | |
889 | else | |
890 | return DEV_DMA_NON_COHERENT; | |
891 | } | |
892 | ||
37ba983c | 893 | static bool of_fwnode_property_present(const struct fwnode_handle *fwnode, |
3708184a SA |
894 | const char *propname) |
895 | { | |
896 | return of_property_read_bool(to_of_node(fwnode), propname); | |
897 | } | |
898 | ||
37ba983c | 899 | static int of_fwnode_property_read_int_array(const struct fwnode_handle *fwnode, |
3708184a SA |
900 | const char *propname, |
901 | unsigned int elem_size, void *val, | |
902 | size_t nval) | |
903 | { | |
37ba983c | 904 | const struct device_node *node = to_of_node(fwnode); |
3708184a SA |
905 | |
906 | if (!val) | |
907 | return of_property_count_elems_of_size(node, propname, | |
908 | elem_size); | |
909 | ||
910 | switch (elem_size) { | |
911 | case sizeof(u8): | |
912 | return of_property_read_u8_array(node, propname, val, nval); | |
913 | case sizeof(u16): | |
914 | return of_property_read_u16_array(node, propname, val, nval); | |
915 | case sizeof(u32): | |
916 | return of_property_read_u32_array(node, propname, val, nval); | |
917 | case sizeof(u64): | |
918 | return of_property_read_u64_array(node, propname, val, nval); | |
919 | } | |
920 | ||
921 | return -ENXIO; | |
922 | } | |
923 | ||
37ba983c SA |
924 | static int |
925 | of_fwnode_property_read_string_array(const struct fwnode_handle *fwnode, | |
926 | const char *propname, const char **val, | |
927 | size_t nval) | |
3708184a | 928 | { |
37ba983c | 929 | const struct device_node *node = to_of_node(fwnode); |
3708184a SA |
930 | |
931 | return val ? | |
932 | of_property_read_string_array(node, propname, val, nval) : | |
933 | of_property_count_strings(node, propname); | |
934 | } | |
935 | ||
bc0500c1 SA |
936 | static const char *of_fwnode_get_name(const struct fwnode_handle *fwnode) |
937 | { | |
938 | return kbasename(to_of_node(fwnode)->full_name); | |
939 | } | |
940 | ||
e7e242bc SA |
941 | static const char *of_fwnode_get_name_prefix(const struct fwnode_handle *fwnode) |
942 | { | |
943 | /* Root needs no prefix here (its name is "/"). */ | |
944 | if (!to_of_node(fwnode)->parent) | |
945 | return ""; | |
946 | ||
947 | return "/"; | |
948 | } | |
949 | ||
37ba983c SA |
950 | static struct fwnode_handle * |
951 | of_fwnode_get_parent(const struct fwnode_handle *fwnode) | |
3708184a SA |
952 | { |
953 | return of_fwnode_handle(of_get_parent(to_of_node(fwnode))); | |
954 | } | |
955 | ||
956 | static struct fwnode_handle * | |
37ba983c | 957 | of_fwnode_get_next_child_node(const struct fwnode_handle *fwnode, |
3708184a SA |
958 | struct fwnode_handle *child) |
959 | { | |
960 | return of_fwnode_handle(of_get_next_available_child(to_of_node(fwnode), | |
961 | to_of_node(child))); | |
962 | } | |
963 | ||
964 | static struct fwnode_handle * | |
37ba983c | 965 | of_fwnode_get_named_child_node(const struct fwnode_handle *fwnode, |
3708184a SA |
966 | const char *childname) |
967 | { | |
37ba983c | 968 | const struct device_node *node = to_of_node(fwnode); |
3708184a SA |
969 | struct device_node *child; |
970 | ||
971 | for_each_available_child_of_node(node, child) | |
b3e46d1a | 972 | if (of_node_name_eq(child, childname)) |
3708184a SA |
973 | return of_fwnode_handle(child); |
974 | ||
975 | return NULL; | |
976 | } | |
977 | ||
3e3119d3 SA |
978 | static int |
979 | of_fwnode_get_reference_args(const struct fwnode_handle *fwnode, | |
980 | const char *prop, const char *nargs_prop, | |
981 | unsigned int nargs, unsigned int index, | |
982 | struct fwnode_reference_args *args) | |
983 | { | |
984 | struct of_phandle_args of_args; | |
985 | unsigned int i; | |
986 | int ret; | |
987 | ||
988 | if (nargs_prop) | |
989 | ret = of_parse_phandle_with_args(to_of_node(fwnode), prop, | |
990 | nargs_prop, index, &of_args); | |
991 | else | |
992 | ret = of_parse_phandle_with_fixed_args(to_of_node(fwnode), prop, | |
993 | nargs, index, &of_args); | |
994 | if (ret < 0) | |
995 | return ret; | |
60d865bd YY |
996 | if (!args) { |
997 | of_node_put(of_args.np); | |
3e3119d3 | 998 | return 0; |
60d865bd | 999 | } |
3e3119d3 SA |
1000 | |
1001 | args->nargs = of_args.args_count; | |
1002 | args->fwnode = of_fwnode_handle(of_args.np); | |
1003 | ||
1004 | for (i = 0; i < NR_FWNODE_REFERENCE_ARGS; i++) | |
1005 | args->args[i] = i < of_args.args_count ? of_args.args[i] : 0; | |
1006 | ||
1007 | return 0; | |
1008 | } | |
1009 | ||
3b27d00e | 1010 | static struct fwnode_handle * |
37ba983c | 1011 | of_fwnode_graph_get_next_endpoint(const struct fwnode_handle *fwnode, |
3b27d00e SA |
1012 | struct fwnode_handle *prev) |
1013 | { | |
1014 | return of_fwnode_handle(of_graph_get_next_endpoint(to_of_node(fwnode), | |
1015 | to_of_node(prev))); | |
1016 | } | |
1017 | ||
1018 | static struct fwnode_handle * | |
37ba983c | 1019 | of_fwnode_graph_get_remote_endpoint(const struct fwnode_handle *fwnode) |
3b27d00e | 1020 | { |
358155ed KM |
1021 | return of_fwnode_handle( |
1022 | of_graph_get_remote_endpoint(to_of_node(fwnode))); | |
3b27d00e SA |
1023 | } |
1024 | ||
1025 | static struct fwnode_handle * | |
1026 | of_fwnode_graph_get_port_parent(struct fwnode_handle *fwnode) | |
1027 | { | |
1028 | struct device_node *np; | |
1029 | ||
1030 | /* Get the parent of the port */ | |
3314c6bd | 1031 | np = of_get_parent(to_of_node(fwnode)); |
3b27d00e SA |
1032 | if (!np) |
1033 | return NULL; | |
1034 | ||
1035 | /* Is this the "ports" node? If not, it's the port parent. */ | |
b3e46d1a | 1036 | if (!of_node_name_eq(np, "ports")) |
3b27d00e SA |
1037 | return of_fwnode_handle(np); |
1038 | ||
1039 | return of_fwnode_handle(of_get_next_parent(np)); | |
1040 | } | |
1041 | ||
37ba983c | 1042 | static int of_fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode, |
3b27d00e SA |
1043 | struct fwnode_endpoint *endpoint) |
1044 | { | |
37ba983c | 1045 | const struct device_node *node = to_of_node(fwnode); |
3b27d00e SA |
1046 | struct device_node *port_node = of_get_parent(node); |
1047 | ||
1048 | endpoint->local_fwnode = fwnode; | |
1049 | ||
1050 | of_property_read_u32(port_node, "reg", &endpoint->port); | |
1051 | of_property_read_u32(node, "reg", &endpoint->id); | |
1052 | ||
1053 | of_node_put(port_node); | |
1054 | ||
1055 | return 0; | |
1056 | } | |
1057 | ||
67dcc26d | 1058 | static const void * |
1c2c82ea SK |
1059 | of_fwnode_device_get_match_data(const struct fwnode_handle *fwnode, |
1060 | const struct device *dev) | |
1061 | { | |
67dcc26d | 1062 | return of_device_get_match_data(dev); |
1c2c82ea SK |
1063 | } |
1064 | ||
a3e1d1a7 SK |
1065 | static bool of_is_ancestor_of(struct device_node *test_ancestor, |
1066 | struct device_node *child) | |
1067 | { | |
1068 | of_node_get(child); | |
1069 | while (child) { | |
1070 | if (child == test_ancestor) { | |
1071 | of_node_put(child); | |
38835391 | 1072 | return true; |
a3e1d1a7 SK |
1073 | } |
1074 | child = of_get_next_parent(child); | |
1075 | } | |
38835391 | 1076 | return false; |
a3e1d1a7 SK |
1077 | } |
1078 | ||
f7514a66 SK |
1079 | static struct device_node *of_get_compat_node(struct device_node *np) |
1080 | { | |
1081 | of_node_get(np); | |
1082 | ||
1083 | while (np) { | |
1084 | if (!of_device_is_available(np)) { | |
1085 | of_node_put(np); | |
1086 | np = NULL; | |
1087 | } | |
1088 | ||
2f0cb475 | 1089 | if (of_property_present(np, "compatible")) |
f7514a66 SK |
1090 | break; |
1091 | ||
1092 | np = of_get_next_parent(np); | |
1093 | } | |
1094 | ||
1095 | return np; | |
1096 | } | |
1097 | ||
3cd6bab2 UH |
1098 | static struct device_node *of_get_compat_node_parent(struct device_node *np) |
1099 | { | |
1100 | struct device_node *parent, *node; | |
1101 | ||
1102 | parent = of_get_parent(np); | |
1103 | node = of_get_compat_node(parent); | |
1104 | of_node_put(parent); | |
1105 | ||
1106 | return node; | |
1107 | } | |
1108 | ||
bb278b14 | 1109 | /** |
8a06d1ea SK |
1110 | * of_link_to_phandle - Add fwnode link to supplier from supplier phandle |
1111 | * @con_np: consumer device tree node | |
1112 | * @sup_np: supplier device tree node | |
a3e1d1a7 SK |
1113 | * |
1114 | * Given a phandle to a supplier device tree node (@sup_np), this function | |
1115 | * finds the device that owns the supplier device tree node and creates a | |
1116 | * device link from @dev consumer device to the supplier device. This function | |
1117 | * doesn't create device links for invalid scenarios such as trying to create a | |
1118 | * link with a parent device as the consumer of its child device. In such | |
1119 | * cases, it returns an error. | |
1120 | * | |
1121 | * Returns: | |
8a06d1ea | 1122 | * - 0 if fwnode link successfully created to supplier |
a3e1d1a7 | 1123 | * - -EINVAL if the supplier link is invalid and should not be created |
8a06d1ea | 1124 | * - -ENODEV if struct device will never be create for supplier |
a3e1d1a7 | 1125 | */ |
8a06d1ea SK |
1126 | static int of_link_to_phandle(struct device_node *con_np, |
1127 | struct device_node *sup_np) | |
a3e1d1a7 | 1128 | { |
8a06d1ea | 1129 | struct device *sup_dev; |
a3e1d1a7 SK |
1130 | struct device_node *tmp_np = sup_np; |
1131 | ||
a3e1d1a7 SK |
1132 | /* |
1133 | * Find the device node that contains the supplier phandle. It may be | |
1134 | * @sup_np or it may be an ancestor of @sup_np. | |
1135 | */ | |
f7514a66 | 1136 | sup_np = of_get_compat_node(sup_np); |
a3e1d1a7 | 1137 | if (!sup_np) { |
8a06d1ea SK |
1138 | pr_debug("Not linking %pOFP to %pOFP - No device\n", |
1139 | con_np, tmp_np); | |
a3e1d1a7 SK |
1140 | return -ENODEV; |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * Don't allow linking a device node as a consumer of one of its | |
1145 | * descendant nodes. By definition, a child node can't be a functional | |
1146 | * dependency for the parent node. | |
1147 | */ | |
8a06d1ea SK |
1148 | if (of_is_ancestor_of(con_np, sup_np)) { |
1149 | pr_debug("Not linking %pOFP to %pOFP - is descendant\n", | |
1150 | con_np, sup_np); | |
a3e1d1a7 SK |
1151 | of_node_put(sup_np); |
1152 | return -EINVAL; | |
1153 | } | |
8a06d1ea SK |
1154 | |
1155 | /* | |
1156 | * Don't create links to "early devices" that won't have struct devices | |
1157 | * created for them. | |
1158 | */ | |
a3e1d1a7 | 1159 | sup_dev = get_dev_from_fwnode(&sup_np->fwnode); |
1753c4d1 SK |
1160 | if (!sup_dev && |
1161 | (of_node_check_flag(sup_np, OF_POPULATED) || | |
1162 | sup_np->fwnode.flags & FWNODE_FLAG_NOT_DEVICE)) { | |
8a06d1ea SK |
1163 | pr_debug("Not linking %pOFP to %pOFP - No struct device\n", |
1164 | con_np, sup_np); | |
bb278b14 | 1165 | of_node_put(sup_np); |
ba861f8e | 1166 | return -ENODEV; |
ba861f8e | 1167 | } |
a3e1d1a7 | 1168 | put_device(sup_dev); |
8a06d1ea SK |
1169 | |
1170 | fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np)); | |
1171 | of_node_put(sup_np); | |
1172 | ||
1173 | return 0; | |
a3e1d1a7 SK |
1174 | } |
1175 | ||
1176 | /** | |
1177 | * parse_prop_cells - Property parsing function for suppliers | |
1178 | * | |
1179 | * @np: Pointer to device tree node containing a list | |
1180 | * @prop_name: Name of property to be parsed. Expected to hold phandle values | |
1181 | * @index: For properties holding a list of phandles, this is the index | |
1182 | * into the list. | |
1183 | * @list_name: Property name that is known to contain list of phandle(s) to | |
1184 | * supplier(s) | |
1185 | * @cells_name: property name that specifies phandles' arguments count | |
1186 | * | |
1187 | * This is a helper function to parse properties that have a known fixed name | |
1188 | * and are a list of phandles and phandle arguments. | |
1189 | * | |
1190 | * Returns: | |
1191 | * - phandle node pointer with refcount incremented. Caller must of_node_put() | |
1192 | * on it when done. | |
1193 | * - NULL if no phandle found at index | |
1194 | */ | |
1195 | static struct device_node *parse_prop_cells(struct device_node *np, | |
1196 | const char *prop_name, int index, | |
1197 | const char *list_name, | |
1198 | const char *cells_name) | |
1199 | { | |
1200 | struct of_phandle_args sup_args; | |
1201 | ||
1202 | if (strcmp(prop_name, list_name)) | |
1203 | return NULL; | |
1204 | ||
1205 | if (of_parse_phandle_with_args(np, list_name, cells_name, index, | |
1206 | &sup_args)) | |
1207 | return NULL; | |
1208 | ||
1209 | return sup_args.np; | |
1210 | } | |
1211 | ||
a436ef4a SK |
1212 | #define DEFINE_SIMPLE_PROP(fname, name, cells) \ |
1213 | static struct device_node *parse_##fname(struct device_node *np, \ | |
1214 | const char *prop_name, int index) \ | |
1215 | { \ | |
1216 | return parse_prop_cells(np, prop_name, index, name, cells); \ | |
a3e1d1a7 SK |
1217 | } |
1218 | ||
1219 | static int strcmp_suffix(const char *str, const char *suffix) | |
1220 | { | |
1221 | unsigned int len, suffix_len; | |
1222 | ||
1223 | len = strlen(str); | |
1224 | suffix_len = strlen(suffix); | |
1225 | if (len <= suffix_len) | |
1226 | return -1; | |
1227 | return strcmp(str + len - suffix_len, suffix); | |
1228 | } | |
1229 | ||
a436ef4a SK |
1230 | /** |
1231 | * parse_suffix_prop_cells - Suffix property parsing function for suppliers | |
1232 | * | |
1233 | * @np: Pointer to device tree node containing a list | |
1234 | * @prop_name: Name of property to be parsed. Expected to hold phandle values | |
1235 | * @index: For properties holding a list of phandles, this is the index | |
1236 | * into the list. | |
1237 | * @suffix: Property suffix that is known to contain list of phandle(s) to | |
1238 | * supplier(s) | |
1239 | * @cells_name: property name that specifies phandles' arguments count | |
1240 | * | |
1241 | * This is a helper function to parse properties that have a known fixed suffix | |
1242 | * and are a list of phandles and phandle arguments. | |
1243 | * | |
1244 | * Returns: | |
1245 | * - phandle node pointer with refcount incremented. Caller must of_node_put() | |
1246 | * on it when done. | |
1247 | * - NULL if no phandle found at index | |
1248 | */ | |
1249 | static struct device_node *parse_suffix_prop_cells(struct device_node *np, | |
1250 | const char *prop_name, int index, | |
1251 | const char *suffix, | |
1252 | const char *cells_name) | |
a3e1d1a7 | 1253 | { |
a436ef4a SK |
1254 | struct of_phandle_args sup_args; |
1255 | ||
1256 | if (strcmp_suffix(prop_name, suffix)) | |
a3e1d1a7 SK |
1257 | return NULL; |
1258 | ||
a436ef4a SK |
1259 | if (of_parse_phandle_with_args(np, prop_name, cells_name, index, |
1260 | &sup_args)) | |
1261 | return NULL; | |
1262 | ||
1263 | return sup_args.np; | |
1264 | } | |
1265 | ||
1266 | #define DEFINE_SUFFIX_PROP(fname, suffix, cells) \ | |
1267 | static struct device_node *parse_##fname(struct device_node *np, \ | |
1268 | const char *prop_name, int index) \ | |
1269 | { \ | |
1270 | return parse_suffix_prop_cells(np, prop_name, index, suffix, cells); \ | |
a3e1d1a7 SK |
1271 | } |
1272 | ||
1273 | /** | |
1274 | * struct supplier_bindings - Property parsing functions for suppliers | |
1275 | * | |
1276 | * @parse_prop: function name | |
1277 | * parse_prop() finds the node corresponding to a supplier phandle | |
1278 | * @parse_prop.np: Pointer to device node holding supplier phandle property | |
1279 | * @parse_prop.prop_name: Name of property holding a phandle value | |
1280 | * @parse_prop.index: For properties holding a list of phandles, this is the | |
1281 | * index into the list | |
3915fed9 | 1282 | * @optional: Describes whether a supplier is mandatory or not |
3cd6bab2 UH |
1283 | * @node_not_dev: The consumer node containing the property is never converted |
1284 | * to a struct device. Instead, parse ancestor nodes for the | |
1285 | * compatible property to find a node corresponding to a device. | |
a3e1d1a7 SK |
1286 | * |
1287 | * Returns: | |
1288 | * parse_prop() return values are | |
1289 | * - phandle node pointer with refcount incremented. Caller must of_node_put() | |
1290 | * on it when done. | |
1291 | * - NULL if no phandle found at index | |
1292 | */ | |
1293 | struct supplier_bindings { | |
1294 | struct device_node *(*parse_prop)(struct device_node *np, | |
1295 | const char *prop_name, int index); | |
a9dd8f3c | 1296 | bool optional; |
f7514a66 | 1297 | bool node_not_dev; |
a3e1d1a7 SK |
1298 | }; |
1299 | ||
a436ef4a SK |
1300 | DEFINE_SIMPLE_PROP(clocks, "clocks", "#clock-cells") |
1301 | DEFINE_SIMPLE_PROP(interconnects, "interconnects", "#interconnect-cells") | |
8e12257d SK |
1302 | DEFINE_SIMPLE_PROP(iommus, "iommus", "#iommu-cells") |
1303 | DEFINE_SIMPLE_PROP(mboxes, "mboxes", "#mbox-cells") | |
1304 | DEFINE_SIMPLE_PROP(io_channels, "io-channel", "#io-channel-cells") | |
7f00be96 SK |
1305 | DEFINE_SIMPLE_PROP(interrupt_parent, "interrupt-parent", NULL) |
1306 | DEFINE_SIMPLE_PROP(dmas, "dmas", "#dma-cells") | |
2f7afc34 SK |
1307 | DEFINE_SIMPLE_PROP(power_domains, "power-domains", "#power-domain-cells") |
1308 | DEFINE_SIMPLE_PROP(hwlocks, "hwlocks", "#hwlock-cells") | |
78056e70 | 1309 | DEFINE_SIMPLE_PROP(extcon, "extcon", NULL) |
53e6a671 SK |
1310 | DEFINE_SIMPLE_PROP(nvmem_cells, "nvmem-cells", NULL) |
1311 | DEFINE_SIMPLE_PROP(phys, "phys", "#phy-cells") | |
1312 | DEFINE_SIMPLE_PROP(wakeup_parent, "wakeup-parent", NULL) | |
fb820b49 SK |
1313 | DEFINE_SIMPLE_PROP(pinctrl0, "pinctrl-0", NULL) |
1314 | DEFINE_SIMPLE_PROP(pinctrl1, "pinctrl-1", NULL) | |
1315 | DEFINE_SIMPLE_PROP(pinctrl2, "pinctrl-2", NULL) | |
1316 | DEFINE_SIMPLE_PROP(pinctrl3, "pinctrl-3", NULL) | |
1317 | DEFINE_SIMPLE_PROP(pinctrl4, "pinctrl-4", NULL) | |
1318 | DEFINE_SIMPLE_PROP(pinctrl5, "pinctrl-5", NULL) | |
1319 | DEFINE_SIMPLE_PROP(pinctrl6, "pinctrl-6", NULL) | |
1320 | DEFINE_SIMPLE_PROP(pinctrl7, "pinctrl-7", NULL) | |
1321 | DEFINE_SIMPLE_PROP(pinctrl8, "pinctrl-8", NULL) | |
f7514a66 | 1322 | DEFINE_SIMPLE_PROP(remote_endpoint, "remote-endpoint", NULL) |
6b2117ad SK |
1323 | DEFINE_SIMPLE_PROP(pwms, "pwms", "#pwm-cells") |
1324 | DEFINE_SIMPLE_PROP(resets, "resets", "#reset-cells") | |
18c585c7 SK |
1325 | DEFINE_SIMPLE_PROP(leds, "leds", NULL) |
1326 | DEFINE_SIMPLE_PROP(backlight, "backlight", NULL) | |
a436ef4a | 1327 | DEFINE_SUFFIX_PROP(regulators, "-supply", NULL) |
7f00be96 | 1328 | DEFINE_SUFFIX_PROP(gpio, "-gpio", "#gpio-cells") |
d473d32c IL |
1329 | |
1330 | static struct device_node *parse_gpios(struct device_node *np, | |
1331 | const char *prop_name, int index) | |
1332 | { | |
1333 | if (!strcmp_suffix(prop_name, ",nr-gpios")) | |
1334 | return NULL; | |
1335 | ||
1336 | return parse_suffix_prop_cells(np, prop_name, index, "-gpios", | |
1337 | "#gpio-cells"); | |
1338 | } | |
a436ef4a | 1339 | |
e149573b WD |
1340 | static struct device_node *parse_iommu_maps(struct device_node *np, |
1341 | const char *prop_name, int index) | |
1342 | { | |
1343 | if (strcmp(prop_name, "iommu-map")) | |
1344 | return NULL; | |
1345 | ||
1346 | return of_parse_phandle(np, prop_name, (index * 4) + 1); | |
1347 | } | |
1348 | ||
e13f5b7a SK |
1349 | static struct device_node *parse_gpio_compat(struct device_node *np, |
1350 | const char *prop_name, int index) | |
1351 | { | |
1352 | struct of_phandle_args sup_args; | |
1353 | ||
1354 | if (strcmp(prop_name, "gpio") && strcmp(prop_name, "gpios")) | |
1355 | return NULL; | |
1356 | ||
1357 | /* | |
1358 | * Ignore node with gpio-hog property since its gpios are all provided | |
1359 | * by its parent. | |
1360 | */ | |
16b0c7ca | 1361 | if (of_property_read_bool(np, "gpio-hog")) |
e13f5b7a SK |
1362 | return NULL; |
1363 | ||
1364 | if (of_parse_phandle_with_args(np, prop_name, "#gpio-cells", index, | |
1365 | &sup_args)) | |
1366 | return NULL; | |
1367 | ||
1368 | return sup_args.np; | |
1369 | } | |
1370 | ||
4104ca77 SK |
1371 | static struct device_node *parse_interrupts(struct device_node *np, |
1372 | const char *prop_name, int index) | |
1373 | { | |
f265f06a SK |
1374 | struct of_phandle_args sup_args; |
1375 | ||
bd6d617a SK |
1376 | if (!IS_ENABLED(CONFIG_OF_IRQ) || IS_ENABLED(CONFIG_PPC)) |
1377 | return NULL; | |
1378 | ||
f265f06a SK |
1379 | if (strcmp(prop_name, "interrupts") && |
1380 | strcmp(prop_name, "interrupts-extended")) | |
4104ca77 SK |
1381 | return NULL; |
1382 | ||
f265f06a | 1383 | return of_irq_parse_one(np, index, &sup_args) ? NULL : sup_args.np; |
4104ca77 SK |
1384 | } |
1385 | ||
af1b967a | 1386 | static const struct supplier_bindings of_supplier_bindings[] = { |
a3e1d1a7 SK |
1387 | { .parse_prop = parse_clocks, }, |
1388 | { .parse_prop = parse_interconnects, }, | |
a9dd8f3c SK |
1389 | { .parse_prop = parse_iommus, .optional = true, }, |
1390 | { .parse_prop = parse_iommu_maps, .optional = true, }, | |
8e12257d SK |
1391 | { .parse_prop = parse_mboxes, }, |
1392 | { .parse_prop = parse_io_channels, }, | |
7f00be96 | 1393 | { .parse_prop = parse_interrupt_parent, }, |
a9dd8f3c | 1394 | { .parse_prop = parse_dmas, .optional = true, }, |
2f7afc34 SK |
1395 | { .parse_prop = parse_power_domains, }, |
1396 | { .parse_prop = parse_hwlocks, }, | |
78056e70 | 1397 | { .parse_prop = parse_extcon, }, |
53e6a671 SK |
1398 | { .parse_prop = parse_nvmem_cells, }, |
1399 | { .parse_prop = parse_phys, }, | |
1400 | { .parse_prop = parse_wakeup_parent, }, | |
fb820b49 SK |
1401 | { .parse_prop = parse_pinctrl0, }, |
1402 | { .parse_prop = parse_pinctrl1, }, | |
1403 | { .parse_prop = parse_pinctrl2, }, | |
1404 | { .parse_prop = parse_pinctrl3, }, | |
1405 | { .parse_prop = parse_pinctrl4, }, | |
1406 | { .parse_prop = parse_pinctrl5, }, | |
1407 | { .parse_prop = parse_pinctrl6, }, | |
1408 | { .parse_prop = parse_pinctrl7, }, | |
1409 | { .parse_prop = parse_pinctrl8, }, | |
f7514a66 | 1410 | { .parse_prop = parse_remote_endpoint, .node_not_dev = true, }, |
6b2117ad SK |
1411 | { .parse_prop = parse_pwms, }, |
1412 | { .parse_prop = parse_resets, }, | |
18c585c7 SK |
1413 | { .parse_prop = parse_leds, }, |
1414 | { .parse_prop = parse_backlight, }, | |
e13f5b7a | 1415 | { .parse_prop = parse_gpio_compat, }, |
4104ca77 | 1416 | { .parse_prop = parse_interrupts, }, |
a3e1d1a7 | 1417 | { .parse_prop = parse_regulators, }, |
7f00be96 SK |
1418 | { .parse_prop = parse_gpio, }, |
1419 | { .parse_prop = parse_gpios, }, | |
af1b967a | 1420 | {} |
a3e1d1a7 SK |
1421 | }; |
1422 | ||
1423 | /** | |
1424 | * of_link_property - Create device links to suppliers listed in a property | |
a3e1d1a7 SK |
1425 | * @con_np: The consumer device tree node which contains the property |
1426 | * @prop_name: Name of property to be parsed | |
1427 | * | |
1428 | * This function checks if the property @prop_name that is present in the | |
1429 | * @con_np device tree node is one of the known common device tree bindings | |
1430 | * that list phandles to suppliers. If @prop_name isn't one, this function | |
1431 | * doesn't do anything. | |
1432 | * | |
8a06d1ea SK |
1433 | * If @prop_name is one, this function attempts to create fwnode links from the |
1434 | * consumer device tree node @con_np to all the suppliers device tree nodes | |
1435 | * listed in @prop_name. | |
a3e1d1a7 | 1436 | * |
8a06d1ea | 1437 | * Any failed attempt to create a fwnode link will NOT result in an immediate |
a3e1d1a7 | 1438 | * return. of_link_property() must create links to all the available supplier |
8a06d1ea SK |
1439 | * device tree nodes even when attempts to create a link to one or more |
1440 | * suppliers fail. | |
a3e1d1a7 | 1441 | */ |
8a06d1ea | 1442 | static int of_link_property(struct device_node *con_np, const char *prop_name) |
a3e1d1a7 SK |
1443 | { |
1444 | struct device_node *phandle; | |
af1b967a | 1445 | const struct supplier_bindings *s = of_supplier_bindings; |
a3e1d1a7 SK |
1446 | unsigned int i = 0; |
1447 | bool matched = false; | |
a3e1d1a7 SK |
1448 | |
1449 | /* Do not stop at first failed link, link all available suppliers. */ | |
1450 | while (!matched && s->parse_prop) { | |
a9dd8f3c SK |
1451 | if (s->optional && !fw_devlink_is_strict()) { |
1452 | s++; | |
1453 | continue; | |
1454 | } | |
1455 | ||
a3e1d1a7 | 1456 | while ((phandle = s->parse_prop(con_np, prop_name, i))) { |
f7514a66 SK |
1457 | struct device_node *con_dev_np; |
1458 | ||
1459 | con_dev_np = s->node_not_dev | |
3cd6bab2 | 1460 | ? of_get_compat_node_parent(con_np) |
f7514a66 | 1461 | : of_node_get(con_np); |
a3e1d1a7 SK |
1462 | matched = true; |
1463 | i++; | |
f7514a66 | 1464 | of_link_to_phandle(con_dev_np, phandle); |
a3e1d1a7 | 1465 | of_node_put(phandle); |
f7514a66 | 1466 | of_node_put(con_dev_np); |
a3e1d1a7 SK |
1467 | } |
1468 | s++; | |
1469 | } | |
065cac6c | 1470 | return 0; |
a3e1d1a7 SK |
1471 | } |
1472 | ||
68b979d0 SA |
1473 | static void __iomem *of_fwnode_iomap(struct fwnode_handle *fwnode, int index) |
1474 | { | |
1475 | #ifdef CONFIG_OF_ADDRESS | |
1476 | return of_iomap(to_of_node(fwnode), index); | |
1477 | #else | |
1478 | return NULL; | |
1479 | #endif | |
1480 | } | |
1481 | ||
99c63707 SA |
1482 | static int of_fwnode_irq_get(const struct fwnode_handle *fwnode, |
1483 | unsigned int index) | |
1484 | { | |
1485 | return of_irq_get(to_of_node(fwnode), index); | |
1486 | } | |
1487 | ||
2d09e6eb | 1488 | static int of_fwnode_add_links(struct fwnode_handle *fwnode) |
a3e1d1a7 | 1489 | { |
a3e1d1a7 | 1490 | struct property *p; |
8a06d1ea | 1491 | struct device_node *con_np = to_of_node(fwnode); |
a3e1d1a7 | 1492 | |
4a48b66b SK |
1493 | if (IS_ENABLED(CONFIG_X86)) |
1494 | return 0; | |
1495 | ||
8a06d1ea SK |
1496 | if (!con_np) |
1497 | return -EINVAL; | |
a3e1d1a7 | 1498 | |
8a06d1ea SK |
1499 | for_each_property_of_node(con_np, p) |
1500 | of_link_property(con_np, p->name); | |
a3e1d1a7 | 1501 | |
8a06d1ea | 1502 | return 0; |
a3e1d1a7 SK |
1503 | } |
1504 | ||
3708184a SA |
1505 | const struct fwnode_operations of_fwnode_ops = { |
1506 | .get = of_fwnode_get, | |
1507 | .put = of_fwnode_put, | |
2294b3af | 1508 | .device_is_available = of_fwnode_device_is_available, |
1c2c82ea | 1509 | .device_get_match_data = of_fwnode_device_get_match_data, |
8c756a0a SA |
1510 | .device_dma_supported = of_fwnode_device_dma_supported, |
1511 | .device_get_dma_attr = of_fwnode_device_get_dma_attr, | |
3708184a SA |
1512 | .property_present = of_fwnode_property_present, |
1513 | .property_read_int_array = of_fwnode_property_read_int_array, | |
1514 | .property_read_string_array = of_fwnode_property_read_string_array, | |
bc0500c1 | 1515 | .get_name = of_fwnode_get_name, |
e7e242bc | 1516 | .get_name_prefix = of_fwnode_get_name_prefix, |
3708184a SA |
1517 | .get_parent = of_fwnode_get_parent, |
1518 | .get_next_child_node = of_fwnode_get_next_child_node, | |
1519 | .get_named_child_node = of_fwnode_get_named_child_node, | |
3e3119d3 | 1520 | .get_reference_args = of_fwnode_get_reference_args, |
3b27d00e SA |
1521 | .graph_get_next_endpoint = of_fwnode_graph_get_next_endpoint, |
1522 | .graph_get_remote_endpoint = of_fwnode_graph_get_remote_endpoint, | |
1523 | .graph_get_port_parent = of_fwnode_graph_get_port_parent, | |
1524 | .graph_parse_endpoint = of_fwnode_graph_parse_endpoint, | |
68b979d0 | 1525 | .iomap = of_fwnode_iomap, |
99c63707 | 1526 | .irq_get = of_fwnode_irq_get, |
a3e1d1a7 | 1527 | .add_links = of_fwnode_add_links, |
3708184a | 1528 | }; |
db3e50f3 | 1529 | EXPORT_SYMBOL_GPL(of_fwnode_ops); |