1 | // SPDX-License-Identifier: GPL-2.0+ |
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. |
20 | */ |
21 | |
22 | #define pr_fmt(fmt) "OF: " fmt |
23 | |
24 | #include <linux/of.h> |
25 | #include <linux/of_address.h> |
26 | #include <linux/of_device.h> |
27 | #include <linux/of_graph.h> |
28 | #include <linux/of_irq.h> |
29 | #include <linux/string.h> |
30 | #include <linux/moduleparam.h> |
31 | |
32 | #include "of_private.h" |
33 | |
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, name: "ports" ); |
46 | if (ports) |
47 | node = ports; |
48 | |
49 | port = of_get_child_by_name(node, name: "port" ); |
50 | of_node_put(node: ports); |
51 | of_node_put(node: port); |
52 | |
53 | return !!port; |
54 | } |
55 | EXPORT_SYMBOL(of_graph_is_present); |
56 | |
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 |
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. |
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, name: propname, NULL); |
75 | |
76 | if (!prop) |
77 | return -EINVAL; |
78 | if (!prop->value) |
79 | return -ENODATA; |
80 | |
81 | if (prop->length % elem_size != 0) { |
82 | pr_err("size of %s in node %pOF is not a multiple of %d\n" , |
83 | propname, np, elem_size); |
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. |
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 |
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, name: propname, NULL); |
111 | |
112 | if (!prop) |
113 | return ERR_PTR(error: -EINVAL); |
114 | if (!prop->value) |
115 | return ERR_PTR(error: -ENODATA); |
116 | if (prop->length < min) |
117 | return ERR_PTR(error: -EOVERFLOW); |
118 | if (max && prop->length > max) |
119 | return ERR_PTR(error: -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 |
136 | * it. |
137 | * |
138 | * Return: 0 on success, -EINVAL if the property does not exist, |
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 | min: ((index + 1) * sizeof(*out_value)), |
150 | max: 0, |
151 | NULL); |
152 | |
153 | if (IS_ERR(ptr: val)) |
154 | return PTR_ERR(ptr: val); |
155 | |
156 | *out_value = be32_to_cpup(p: ((__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 |
170 | * it. |
171 | * |
172 | * Return: 0 on success, -EINVAL if the property does not exist, |
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 | min: ((index + 1) * sizeof(*out_value)), |
184 | max: 0, NULL); |
185 | |
186 | if (IS_ERR(ptr: val)) |
187 | return PTR_ERR(ptr: val); |
188 | |
189 | *out_value = be64_to_cpup(p: ((__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. |
200 | * @out_values: pointer to found values. |
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 |
207 | * it. |
208 | * |
209 | * dts entry of array should be like: |
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. |
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 | min: (sz_min * sizeof(*out_values)), |
225 | max: (sz_max * sizeof(*out_values)), |
226 | len: &sz); |
227 | |
228 | if (IS_ERR(ptr: val)) |
229 | return PTR_ERR(ptr: 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. |
250 | * @out_values: pointer to found values. |
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 |
257 | * it. |
258 | * |
259 | * dts entry of array should be like: |
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. |
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 | min: (sz_min * sizeof(*out_values)), |
275 | max: (sz_max * sizeof(*out_values)), |
276 | len: &sz); |
277 | |
278 | if (IS_ERR(ptr: val)) |
279 | return PTR_ERR(ptr: 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(p: 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. |
300 | * @out_values: pointer to return found values. |
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 |
307 | * it. |
308 | * |
309 | * Return: The number of elements read on success, -EINVAL if the property |
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 | min: (sz_min * sizeof(*out_values)), |
322 | max: (sz_max * sizeof(*out_values)), |
323 | len: &sz); |
324 | |
325 | if (IS_ERR(ptr: val)) |
326 | return PTR_ERR(ptr: 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(p: 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 |
348 | * it. |
349 | * |
350 | * Return: 0 on success, -EINVAL if the property does not exist, |
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 | min: sizeof(*out_value), |
361 | max: 0, |
362 | NULL); |
363 | |
364 | if (IS_ERR(ptr: val)) |
365 | return PTR_ERR(ptr: val); |
366 | |
367 | *out_value = of_read_number(cell: val, size: 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. |
378 | * @out_values: pointer to found values. |
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 |
385 | * it. |
386 | * |
387 | * Return: The number of elements read on success, -EINVAL if the property |
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 | min: (sz_min * sizeof(*out_values)), |
400 | max: (sz_max * sizeof(*out_values)), |
401 | len: &sz); |
402 | |
403 | if (IS_ERR(ptr: val)) |
404 | return PTR_ERR(ptr: 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(cell: val, size: 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 |
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. |
434 | * |
435 | * Note that the empty string "" has length of 1, thus -ENODATA cannot |
436 | * be interpreted as an empty string. |
437 | * |
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, name: propname, NULL); |
444 | if (!prop) |
445 | return -EINVAL; |
446 | if (!prop->length) |
447 | return -ENODATA; |
448 | if (strnlen(p: prop->value, maxlen: 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, name: 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, maxlen: 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, name: 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, maxlen: 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(p: 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 | |
583 | WARN_ONCE(!port_node, "%s(): endpoint %pOF has no parent node\n" , |
584 | __func__, node); |
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(np: port_node, propname: "reg" , out_value: &endpoint->port); |
594 | of_property_read_u32(np: node, propname: "reg" , out_value: &endpoint->id); |
595 | |
596 | of_node_put(node: 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(node: parent, name: "ports" ); |
615 | if (node) |
616 | parent = node; |
617 | |
618 | for_each_child_of_node(parent, port) { |
619 | u32 port_id = 0; |
620 | |
621 | if (!of_node_name_eq(np: port, name: "port" )) |
622 | continue; |
623 | of_property_read_u32(np: port, propname: "reg" , out_value: &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(node: parent, name: "ports" ); |
660 | if (node) |
661 | parent = node; |
662 | |
663 | port = of_get_child_by_name(node: parent, name: "port" ); |
664 | of_node_put(node); |
665 | |
666 | if (!port) { |
667 | pr_err("graph: no port node found in %pOF\n" , parent); |
668 | return NULL; |
669 | } |
670 | } else { |
671 | port = of_get_parent(node: prev); |
672 | if (WARN_ONCE(!port, "%s(): endpoint %pOF has no parent node\n" , |
673 | __func__, prev)) |
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(node: port, prev); |
684 | if (endpoint) { |
685 | of_node_put(node: 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(node: parent, prev: port); |
694 | if (!port) |
695 | return NULL; |
696 | } while (!of_node_name_eq(np: port, name: "port" )); |
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 |
709 | * ignored when they are -1. Use of_node_put() on the pointer when done. |
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 | |
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(np: node, phandle_name: "remote-endpoint" , index: 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 | |
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 | |
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); |
765 | if (depth == 2 && !of_node_name_eq(np: node, name: "ports" )) |
766 | break; |
767 | } |
768 | return node; |
769 | } |
770 | EXPORT_SYMBOL(of_graph_get_port_parent); |
771 | |
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 | { |
782 | struct device_node *np, *pp; |
783 | |
784 | /* Get remote endpoint node. */ |
785 | np = of_graph_get_remote_endpoint(node); |
786 | |
787 | pp = of_graph_get_port_parent(np); |
788 | |
789 | of_node_put(node: np); |
790 | |
791 | return pp; |
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 |
800 | * to @node. Use of_node_put() on it when done. |
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. */ |
807 | np = of_graph_get_remote_endpoint(node); |
808 | if (!np) |
809 | return NULL; |
810 | return of_get_next_parent(node: np); |
811 | } |
812 | EXPORT_SYMBOL(of_graph_get_remote_port); |
813 | |
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 | |
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 |
833 | * to @node. Use of_node_put() on it when done. |
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) { |
842 | pr_debug("no valid endpoint (%d, %d) for node %pOF\n" , |
843 | port, endpoint, node); |
844 | return NULL; |
845 | } |
846 | |
847 | remote = of_graph_get_remote_port_parent(endpoint_node); |
848 | of_node_put(node: endpoint_node); |
849 | if (!remote) { |
850 | pr_debug("no valid remote node\n" ); |
851 | return NULL; |
852 | } |
853 | |
854 | if (!of_device_is_available(device: remote)) { |
855 | pr_debug("not available for remote node\n" ); |
856 | of_node_put(node: remote); |
857 | return NULL; |
858 | } |
859 | |
860 | return remote; |
861 | } |
862 | EXPORT_SYMBOL(of_graph_get_remote_node); |
863 | |
864 | static struct fwnode_handle *of_fwnode_get(struct fwnode_handle *fwnode) |
865 | { |
866 | return of_fwnode_handle(of_node_get(to_of_node(fwnode))); |
867 | } |
868 | |
869 | static void of_fwnode_put(struct fwnode_handle *fwnode) |
870 | { |
871 | of_node_put(to_of_node(fwnode)); |
872 | } |
873 | |
874 | static bool of_fwnode_device_is_available(const struct fwnode_handle *fwnode) |
875 | { |
876 | return of_device_is_available(to_of_node(fwnode)); |
877 | } |
878 | |
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 | |
893 | static bool of_fwnode_property_present(const struct fwnode_handle *fwnode, |
894 | const char *propname) |
895 | { |
896 | return of_property_read_bool(to_of_node(fwnode), propname); |
897 | } |
898 | |
899 | static int of_fwnode_property_read_int_array(const struct fwnode_handle *fwnode, |
900 | const char *propname, |
901 | unsigned int elem_size, void *val, |
902 | size_t nval) |
903 | { |
904 | const struct device_node *node = to_of_node(fwnode); |
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(np: node, propname, out_values: val, sz: nval); |
913 | case sizeof(u16): |
914 | return of_property_read_u16_array(np: node, propname, out_values: val, sz: nval); |
915 | case sizeof(u32): |
916 | return of_property_read_u32_array(np: node, propname, out_values: val, sz: nval); |
917 | case sizeof(u64): |
918 | return of_property_read_u64_array(np: node, propname, out_values: val, sz: nval); |
919 | } |
920 | |
921 | return -ENXIO; |
922 | } |
923 | |
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) |
928 | { |
929 | const struct device_node *node = to_of_node(fwnode); |
930 | |
931 | return val ? |
932 | of_property_read_string_array(np: node, propname, out_strs: val, sz: nval) : |
933 | of_property_count_strings(np: node, propname); |
934 | } |
935 | |
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 | |
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 | |
950 | static struct fwnode_handle * |
951 | of_fwnode_get_parent(const struct fwnode_handle *fwnode) |
952 | { |
953 | return of_fwnode_handle(of_get_parent(to_of_node(fwnode))); |
954 | } |
955 | |
956 | static struct fwnode_handle * |
957 | of_fwnode_get_next_child_node(const struct fwnode_handle *fwnode, |
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 * |
965 | of_fwnode_get_named_child_node(const struct fwnode_handle *fwnode, |
966 | const char *childname) |
967 | { |
968 | const struct device_node *node = to_of_node(fwnode); |
969 | struct device_node *child; |
970 | |
971 | for_each_available_child_of_node(node, child) |
972 | if (of_node_name_eq(np: child, name: childname)) |
973 | return of_fwnode_handle(child); |
974 | |
975 | return NULL; |
976 | } |
977 | |
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), list_name: prop, |
990 | cells_name: nargs_prop, index, out_args: &of_args); |
991 | else |
992 | ret = of_parse_phandle_with_fixed_args(to_of_node(fwnode), list_name: prop, |
993 | cell_count: nargs, index, out_args: &of_args); |
994 | if (ret < 0) |
995 | return ret; |
996 | if (!args) { |
997 | of_node_put(node: of_args.np); |
998 | return 0; |
999 | } |
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 | |
1010 | static struct fwnode_handle * |
1011 | of_fwnode_graph_get_next_endpoint(const struct fwnode_handle *fwnode, |
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 * |
1019 | of_fwnode_graph_get_remote_endpoint(const struct fwnode_handle *fwnode) |
1020 | { |
1021 | return of_fwnode_handle( |
1022 | of_graph_get_remote_endpoint(to_of_node(fwnode))); |
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 */ |
1031 | np = of_get_parent(to_of_node(fwnode)); |
1032 | if (!np) |
1033 | return NULL; |
1034 | |
1035 | /* Is this the "ports" node? If not, it's the port parent. */ |
1036 | if (!of_node_name_eq(np, name: "ports" )) |
1037 | return of_fwnode_handle(np); |
1038 | |
1039 | return of_fwnode_handle(of_get_next_parent(np)); |
1040 | } |
1041 | |
1042 | static int of_fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode, |
1043 | struct fwnode_endpoint *endpoint) |
1044 | { |
1045 | const struct device_node *node = to_of_node(fwnode); |
1046 | struct device_node *port_node = of_get_parent(node); |
1047 | |
1048 | endpoint->local_fwnode = fwnode; |
1049 | |
1050 | of_property_read_u32(np: port_node, propname: "reg" , out_value: &endpoint->port); |
1051 | of_property_read_u32(np: node, propname: "reg" , out_value: &endpoint->id); |
1052 | |
1053 | of_node_put(node: port_node); |
1054 | |
1055 | return 0; |
1056 | } |
1057 | |
1058 | static const void * |
1059 | of_fwnode_device_get_match_data(const struct fwnode_handle *fwnode, |
1060 | const struct device *dev) |
1061 | { |
1062 | return of_device_get_match_data(dev); |
1063 | } |
1064 | |
1065 | static struct device_node *of_get_compat_node(struct device_node *np) |
1066 | { |
1067 | of_node_get(node: np); |
1068 | |
1069 | while (np) { |
1070 | if (!of_device_is_available(device: np)) { |
1071 | of_node_put(node: np); |
1072 | np = NULL; |
1073 | } |
1074 | |
1075 | if (of_property_present(np, propname: "compatible" )) |
1076 | break; |
1077 | |
1078 | np = of_get_next_parent(node: np); |
1079 | } |
1080 | |
1081 | return np; |
1082 | } |
1083 | |
1084 | static struct device_node *of_get_compat_node_parent(struct device_node *np) |
1085 | { |
1086 | struct device_node *parent, *node; |
1087 | |
1088 | parent = of_get_parent(node: np); |
1089 | node = of_get_compat_node(np: parent); |
1090 | of_node_put(node: parent); |
1091 | |
1092 | return node; |
1093 | } |
1094 | |
1095 | static void of_link_to_phandle(struct device_node *con_np, |
1096 | struct device_node *sup_np) |
1097 | { |
1098 | struct device_node *tmp_np = of_node_get(node: sup_np); |
1099 | |
1100 | /* Check that sup_np and its ancestors are available. */ |
1101 | while (tmp_np) { |
1102 | if (of_fwnode_handle(tmp_np)->dev) { |
1103 | of_node_put(node: tmp_np); |
1104 | break; |
1105 | } |
1106 | |
1107 | if (!of_device_is_available(device: tmp_np)) { |
1108 | of_node_put(node: tmp_np); |
1109 | return; |
1110 | } |
1111 | |
1112 | tmp_np = of_get_next_parent(node: tmp_np); |
1113 | } |
1114 | |
1115 | fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np)); |
1116 | } |
1117 | |
1118 | /** |
1119 | * parse_prop_cells - Property parsing function for suppliers |
1120 | * |
1121 | * @np: Pointer to device tree node containing a list |
1122 | * @prop_name: Name of property to be parsed. Expected to hold phandle values |
1123 | * @index: For properties holding a list of phandles, this is the index |
1124 | * into the list. |
1125 | * @list_name: Property name that is known to contain list of phandle(s) to |
1126 | * supplier(s) |
1127 | * @cells_name: property name that specifies phandles' arguments count |
1128 | * |
1129 | * This is a helper function to parse properties that have a known fixed name |
1130 | * and are a list of phandles and phandle arguments. |
1131 | * |
1132 | * Returns: |
1133 | * - phandle node pointer with refcount incremented. Caller must of_node_put() |
1134 | * on it when done. |
1135 | * - NULL if no phandle found at index |
1136 | */ |
1137 | static struct device_node *parse_prop_cells(struct device_node *np, |
1138 | const char *prop_name, int index, |
1139 | const char *list_name, |
1140 | const char *cells_name) |
1141 | { |
1142 | struct of_phandle_args sup_args; |
1143 | |
1144 | if (strcmp(prop_name, list_name)) |
1145 | return NULL; |
1146 | |
1147 | if (__of_parse_phandle_with_args(np, list_name, cells_name, cell_count: 0, index, |
1148 | out_args: &sup_args)) |
1149 | return NULL; |
1150 | |
1151 | return sup_args.np; |
1152 | } |
1153 | |
1154 | #define DEFINE_SIMPLE_PROP(fname, name, cells) \ |
1155 | static struct device_node *parse_##fname(struct device_node *np, \ |
1156 | const char *prop_name, int index) \ |
1157 | { \ |
1158 | return parse_prop_cells(np, prop_name, index, name, cells); \ |
1159 | } |
1160 | |
1161 | static int strcmp_suffix(const char *str, const char *suffix) |
1162 | { |
1163 | unsigned int len, suffix_len; |
1164 | |
1165 | len = strlen(str); |
1166 | suffix_len = strlen(suffix); |
1167 | if (len <= suffix_len) |
1168 | return -1; |
1169 | return strcmp(str + len - suffix_len, suffix); |
1170 | } |
1171 | |
1172 | /** |
1173 | * parse_suffix_prop_cells - Suffix property parsing function for suppliers |
1174 | * |
1175 | * @np: Pointer to device tree node containing a list |
1176 | * @prop_name: Name of property to be parsed. Expected to hold phandle values |
1177 | * @index: For properties holding a list of phandles, this is the index |
1178 | * into the list. |
1179 | * @suffix: Property suffix that is known to contain list of phandle(s) to |
1180 | * supplier(s) |
1181 | * @cells_name: property name that specifies phandles' arguments count |
1182 | * |
1183 | * This is a helper function to parse properties that have a known fixed suffix |
1184 | * and are a list of phandles and phandle arguments. |
1185 | * |
1186 | * Returns: |
1187 | * - phandle node pointer with refcount incremented. Caller must of_node_put() |
1188 | * on it when done. |
1189 | * - NULL if no phandle found at index |
1190 | */ |
1191 | static struct device_node *parse_suffix_prop_cells(struct device_node *np, |
1192 | const char *prop_name, int index, |
1193 | const char *suffix, |
1194 | const char *cells_name) |
1195 | { |
1196 | struct of_phandle_args sup_args; |
1197 | |
1198 | if (strcmp_suffix(str: prop_name, suffix)) |
1199 | return NULL; |
1200 | |
1201 | if (of_parse_phandle_with_args(np, list_name: prop_name, cells_name, index, |
1202 | out_args: &sup_args)) |
1203 | return NULL; |
1204 | |
1205 | return sup_args.np; |
1206 | } |
1207 | |
1208 | #define DEFINE_SUFFIX_PROP(fname, suffix, cells) \ |
1209 | static struct device_node *parse_##fname(struct device_node *np, \ |
1210 | const char *prop_name, int index) \ |
1211 | { \ |
1212 | return parse_suffix_prop_cells(np, prop_name, index, suffix, cells); \ |
1213 | } |
1214 | |
1215 | /** |
1216 | * struct supplier_bindings - Property parsing functions for suppliers |
1217 | * |
1218 | * @parse_prop: function name |
1219 | * parse_prop() finds the node corresponding to a supplier phandle |
1220 | * @parse_prop.np: Pointer to device node holding supplier phandle property |
1221 | * @parse_prop.prop_name: Name of property holding a phandle value |
1222 | * @parse_prop.index: For properties holding a list of phandles, this is the |
1223 | * index into the list |
1224 | * @optional: Describes whether a supplier is mandatory or not |
1225 | * @node_not_dev: The consumer node containing the property is never converted |
1226 | * to a struct device. Instead, parse ancestor nodes for the |
1227 | * compatible property to find a node corresponding to a device. |
1228 | * |
1229 | * Returns: |
1230 | * parse_prop() return values are |
1231 | * - phandle node pointer with refcount incremented. Caller must of_node_put() |
1232 | * on it when done. |
1233 | * - NULL if no phandle found at index |
1234 | */ |
1235 | struct supplier_bindings { |
1236 | struct device_node *(*parse_prop)(struct device_node *np, |
1237 | const char *prop_name, int index); |
1238 | bool optional; |
1239 | bool node_not_dev; |
1240 | }; |
1241 | |
1242 | DEFINE_SIMPLE_PROP(clocks, "clocks" , "#clock-cells" ) |
1243 | DEFINE_SIMPLE_PROP(interconnects, "interconnects" , "#interconnect-cells" ) |
1244 | DEFINE_SIMPLE_PROP(iommus, "iommus" , "#iommu-cells" ) |
1245 | DEFINE_SIMPLE_PROP(mboxes, "mboxes" , "#mbox-cells" ) |
1246 | DEFINE_SIMPLE_PROP(io_channels, "io-channel" , "#io-channel-cells" ) |
1247 | DEFINE_SIMPLE_PROP(interrupt_parent, "interrupt-parent" , NULL) |
1248 | DEFINE_SIMPLE_PROP(dmas, "dmas" , "#dma-cells" ) |
1249 | DEFINE_SIMPLE_PROP(power_domains, "power-domains" , "#power-domain-cells" ) |
1250 | DEFINE_SIMPLE_PROP(hwlocks, "hwlocks" , "#hwlock-cells" ) |
1251 | DEFINE_SIMPLE_PROP(extcon, "extcon" , NULL) |
1252 | DEFINE_SIMPLE_PROP(nvmem_cells, "nvmem-cells" , "#nvmem-cell-cells" ) |
1253 | DEFINE_SIMPLE_PROP(phys, "phys" , "#phy-cells" ) |
1254 | DEFINE_SIMPLE_PROP(wakeup_parent, "wakeup-parent" , NULL) |
1255 | DEFINE_SIMPLE_PROP(pinctrl0, "pinctrl-0" , NULL) |
1256 | DEFINE_SIMPLE_PROP(pinctrl1, "pinctrl-1" , NULL) |
1257 | DEFINE_SIMPLE_PROP(pinctrl2, "pinctrl-2" , NULL) |
1258 | DEFINE_SIMPLE_PROP(pinctrl3, "pinctrl-3" , NULL) |
1259 | DEFINE_SIMPLE_PROP(pinctrl4, "pinctrl-4" , NULL) |
1260 | DEFINE_SIMPLE_PROP(pinctrl5, "pinctrl-5" , NULL) |
1261 | DEFINE_SIMPLE_PROP(pinctrl6, "pinctrl-6" , NULL) |
1262 | DEFINE_SIMPLE_PROP(pinctrl7, "pinctrl-7" , NULL) |
1263 | DEFINE_SIMPLE_PROP(pinctrl8, "pinctrl-8" , NULL) |
1264 | DEFINE_SIMPLE_PROP(remote_endpoint, "remote-endpoint" , NULL) |
1265 | DEFINE_SIMPLE_PROP(pwms, "pwms" , "#pwm-cells" ) |
1266 | DEFINE_SIMPLE_PROP(resets, "resets" , "#reset-cells" ) |
1267 | DEFINE_SIMPLE_PROP(leds, "leds" , NULL) |
1268 | DEFINE_SIMPLE_PROP(backlight, "backlight" , NULL) |
1269 | DEFINE_SIMPLE_PROP(panel, "panel" , NULL) |
1270 | DEFINE_SUFFIX_PROP(regulators, "-supply" , NULL) |
1271 | DEFINE_SUFFIX_PROP(gpio, "-gpio" , "#gpio-cells" ) |
1272 | |
1273 | static struct device_node *parse_gpios(struct device_node *np, |
1274 | const char *prop_name, int index) |
1275 | { |
1276 | if (!strcmp_suffix(str: prop_name, suffix: ",nr-gpios" )) |
1277 | return NULL; |
1278 | |
1279 | return parse_suffix_prop_cells(np, prop_name, index, suffix: "-gpios" , |
1280 | cells_name: "#gpio-cells" ); |
1281 | } |
1282 | |
1283 | static struct device_node *parse_iommu_maps(struct device_node *np, |
1284 | const char *prop_name, int index) |
1285 | { |
1286 | if (strcmp(prop_name, "iommu-map" )) |
1287 | return NULL; |
1288 | |
1289 | return of_parse_phandle(np, phandle_name: prop_name, index: (index * 4) + 1); |
1290 | } |
1291 | |
1292 | static struct device_node *parse_gpio_compat(struct device_node *np, |
1293 | const char *prop_name, int index) |
1294 | { |
1295 | struct of_phandle_args sup_args; |
1296 | |
1297 | if (strcmp(prop_name, "gpio" ) && strcmp(prop_name, "gpios" )) |
1298 | return NULL; |
1299 | |
1300 | /* |
1301 | * Ignore node with gpio-hog property since its gpios are all provided |
1302 | * by its parent. |
1303 | */ |
1304 | if (of_property_read_bool(np, propname: "gpio-hog" )) |
1305 | return NULL; |
1306 | |
1307 | if (of_parse_phandle_with_args(np, list_name: prop_name, cells_name: "#gpio-cells" , index, |
1308 | out_args: &sup_args)) |
1309 | return NULL; |
1310 | |
1311 | return sup_args.np; |
1312 | } |
1313 | |
1314 | static struct device_node *parse_interrupts(struct device_node *np, |
1315 | const char *prop_name, int index) |
1316 | { |
1317 | struct of_phandle_args sup_args; |
1318 | |
1319 | if (!IS_ENABLED(CONFIG_OF_IRQ) || IS_ENABLED(CONFIG_PPC)) |
1320 | return NULL; |
1321 | |
1322 | if (strcmp(prop_name, "interrupts" ) && |
1323 | strcmp(prop_name, "interrupts-extended" )) |
1324 | return NULL; |
1325 | |
1326 | return of_irq_parse_one(device: np, index, out_irq: &sup_args) ? NULL : sup_args.np; |
1327 | } |
1328 | |
1329 | static const struct supplier_bindings of_supplier_bindings[] = { |
1330 | { .parse_prop = parse_clocks, }, |
1331 | { .parse_prop = parse_interconnects, }, |
1332 | { .parse_prop = parse_iommus, .optional = true, }, |
1333 | { .parse_prop = parse_iommu_maps, .optional = true, }, |
1334 | { .parse_prop = parse_mboxes, }, |
1335 | { .parse_prop = parse_io_channels, }, |
1336 | { .parse_prop = parse_interrupt_parent, }, |
1337 | { .parse_prop = parse_dmas, .optional = true, }, |
1338 | { .parse_prop = parse_power_domains, }, |
1339 | { .parse_prop = parse_hwlocks, }, |
1340 | { .parse_prop = parse_extcon, }, |
1341 | { .parse_prop = parse_nvmem_cells, }, |
1342 | { .parse_prop = parse_phys, }, |
1343 | { .parse_prop = parse_wakeup_parent, }, |
1344 | { .parse_prop = parse_pinctrl0, }, |
1345 | { .parse_prop = parse_pinctrl1, }, |
1346 | { .parse_prop = parse_pinctrl2, }, |
1347 | { .parse_prop = parse_pinctrl3, }, |
1348 | { .parse_prop = parse_pinctrl4, }, |
1349 | { .parse_prop = parse_pinctrl5, }, |
1350 | { .parse_prop = parse_pinctrl6, }, |
1351 | { .parse_prop = parse_pinctrl7, }, |
1352 | { .parse_prop = parse_pinctrl8, }, |
1353 | { .parse_prop = parse_remote_endpoint, .node_not_dev = true, }, |
1354 | { .parse_prop = parse_pwms, }, |
1355 | { .parse_prop = parse_resets, }, |
1356 | { .parse_prop = parse_leds, }, |
1357 | { .parse_prop = parse_backlight, }, |
1358 | { .parse_prop = parse_panel, }, |
1359 | { .parse_prop = parse_gpio_compat, }, |
1360 | { .parse_prop = parse_interrupts, }, |
1361 | { .parse_prop = parse_regulators, }, |
1362 | { .parse_prop = parse_gpio, }, |
1363 | { .parse_prop = parse_gpios, }, |
1364 | {} |
1365 | }; |
1366 | |
1367 | /** |
1368 | * of_link_property - Create device links to suppliers listed in a property |
1369 | * @con_np: The consumer device tree node which contains the property |
1370 | * @prop_name: Name of property to be parsed |
1371 | * |
1372 | * This function checks if the property @prop_name that is present in the |
1373 | * @con_np device tree node is one of the known common device tree bindings |
1374 | * that list phandles to suppliers. If @prop_name isn't one, this function |
1375 | * doesn't do anything. |
1376 | * |
1377 | * If @prop_name is one, this function attempts to create fwnode links from the |
1378 | * consumer device tree node @con_np to all the suppliers device tree nodes |
1379 | * listed in @prop_name. |
1380 | * |
1381 | * Any failed attempt to create a fwnode link will NOT result in an immediate |
1382 | * return. of_link_property() must create links to all the available supplier |
1383 | * device tree nodes even when attempts to create a link to one or more |
1384 | * suppliers fail. |
1385 | */ |
1386 | static int of_link_property(struct device_node *con_np, const char *prop_name) |
1387 | { |
1388 | struct device_node *phandle; |
1389 | const struct supplier_bindings *s = of_supplier_bindings; |
1390 | unsigned int i = 0; |
1391 | bool matched = false; |
1392 | |
1393 | /* Do not stop at first failed link, link all available suppliers. */ |
1394 | while (!matched && s->parse_prop) { |
1395 | if (s->optional && !fw_devlink_is_strict()) { |
1396 | s++; |
1397 | continue; |
1398 | } |
1399 | |
1400 | while ((phandle = s->parse_prop(con_np, prop_name, i))) { |
1401 | struct device_node *con_dev_np; |
1402 | |
1403 | con_dev_np = s->node_not_dev |
1404 | ? of_get_compat_node_parent(np: con_np) |
1405 | : of_node_get(node: con_np); |
1406 | matched = true; |
1407 | i++; |
1408 | of_link_to_phandle(con_np: con_dev_np, sup_np: phandle); |
1409 | of_node_put(node: phandle); |
1410 | of_node_put(node: con_dev_np); |
1411 | } |
1412 | s++; |
1413 | } |
1414 | return 0; |
1415 | } |
1416 | |
1417 | static void __iomem *of_fwnode_iomap(struct fwnode_handle *fwnode, int index) |
1418 | { |
1419 | #ifdef CONFIG_OF_ADDRESS |
1420 | return of_iomap(to_of_node(fwnode), index); |
1421 | #else |
1422 | return NULL; |
1423 | #endif |
1424 | } |
1425 | |
1426 | static int of_fwnode_irq_get(const struct fwnode_handle *fwnode, |
1427 | unsigned int index) |
1428 | { |
1429 | return of_irq_get(to_of_node(fwnode), index); |
1430 | } |
1431 | |
1432 | static int of_fwnode_add_links(struct fwnode_handle *fwnode) |
1433 | { |
1434 | struct property *p; |
1435 | struct device_node *con_np = to_of_node(fwnode); |
1436 | |
1437 | if (IS_ENABLED(CONFIG_X86)) |
1438 | return 0; |
1439 | |
1440 | if (!con_np) |
1441 | return -EINVAL; |
1442 | |
1443 | for_each_property_of_node(con_np, p) |
1444 | of_link_property(con_np, prop_name: p->name); |
1445 | |
1446 | return 0; |
1447 | } |
1448 | |
1449 | const struct fwnode_operations of_fwnode_ops = { |
1450 | .get = of_fwnode_get, |
1451 | .put = of_fwnode_put, |
1452 | .device_is_available = of_fwnode_device_is_available, |
1453 | .device_get_match_data = of_fwnode_device_get_match_data, |
1454 | .device_dma_supported = of_fwnode_device_dma_supported, |
1455 | .device_get_dma_attr = of_fwnode_device_get_dma_attr, |
1456 | .property_present = of_fwnode_property_present, |
1457 | .property_read_int_array = of_fwnode_property_read_int_array, |
1458 | .property_read_string_array = of_fwnode_property_read_string_array, |
1459 | .get_name = of_fwnode_get_name, |
1460 | .get_name_prefix = of_fwnode_get_name_prefix, |
1461 | .get_parent = of_fwnode_get_parent, |
1462 | .get_next_child_node = of_fwnode_get_next_child_node, |
1463 | .get_named_child_node = of_fwnode_get_named_child_node, |
1464 | .get_reference_args = of_fwnode_get_reference_args, |
1465 | .graph_get_next_endpoint = of_fwnode_graph_get_next_endpoint, |
1466 | .graph_get_remote_endpoint = of_fwnode_graph_get_remote_endpoint, |
1467 | .graph_get_port_parent = of_fwnode_graph_get_port_parent, |
1468 | .graph_parse_endpoint = of_fwnode_graph_parse_endpoint, |
1469 | .iomap = of_fwnode_iomap, |
1470 | .irq_get = of_fwnode_irq_get, |
1471 | .add_links = of_fwnode_add_links, |
1472 | }; |
1473 | EXPORT_SYMBOL_GPL(of_fwnode_ops); |
1474 | |