Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * property.c - Unified device property interface.
4 : *
5 : * Copyright (C) 2014, Intel Corporation
6 : * Authors: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
7 : * Mika Westerberg <mika.westerberg@linux.intel.com>
8 : */
9 :
10 : #include <linux/acpi.h>
11 : #include <linux/export.h>
12 : #include <linux/kernel.h>
13 : #include <linux/of.h>
14 : #include <linux/of_address.h>
15 : #include <linux/of_graph.h>
16 : #include <linux/of_irq.h>
17 : #include <linux/property.h>
18 : #include <linux/phy.h>
19 :
20 545 : struct fwnode_handle *__dev_fwnode(struct device *dev)
21 : {
22 : return IS_ENABLED(CONFIG_OF) && dev->of_node ?
23 545 : of_fwnode_handle(dev->of_node) : dev->fwnode;
24 : }
25 : EXPORT_SYMBOL_GPL(__dev_fwnode);
26 :
27 0 : const struct fwnode_handle *__dev_fwnode_const(const struct device *dev)
28 : {
29 : return IS_ENABLED(CONFIG_OF) && dev->of_node ?
30 0 : of_fwnode_handle(dev->of_node) : dev->fwnode;
31 : }
32 : EXPORT_SYMBOL_GPL(__dev_fwnode_const);
33 :
34 : /**
35 : * device_property_present - check if a property of a device is present
36 : * @dev: Device whose property is being checked
37 : * @propname: Name of the property
38 : *
39 : * Check if property @propname is present in the device firmware description.
40 : *
41 : * Return: true if property @propname is present. Otherwise, returns false.
42 : */
43 0 : bool device_property_present(const struct device *dev, const char *propname)
44 : {
45 0 : return fwnode_property_present(dev_fwnode(dev), propname);
46 : }
47 : EXPORT_SYMBOL_GPL(device_property_present);
48 :
49 : /**
50 : * fwnode_property_present - check if a property of a firmware node is present
51 : * @fwnode: Firmware node whose property to check
52 : * @propname: Name of the property
53 : *
54 : * Return: true if property @propname is present. Otherwise, returns false.
55 : */
56 0 : bool fwnode_property_present(const struct fwnode_handle *fwnode,
57 : const char *propname)
58 : {
59 : bool ret;
60 :
61 0 : if (IS_ERR_OR_NULL(fwnode))
62 : return false;
63 :
64 0 : ret = fwnode_call_bool_op(fwnode, property_present, propname);
65 0 : if (ret)
66 : return ret;
67 :
68 0 : return fwnode_call_bool_op(fwnode->secondary, property_present, propname);
69 : }
70 : EXPORT_SYMBOL_GPL(fwnode_property_present);
71 :
72 : /**
73 : * device_property_read_u8_array - return a u8 array property of a device
74 : * @dev: Device to get the property of
75 : * @propname: Name of the property
76 : * @val: The values are stored here or %NULL to return the number of values
77 : * @nval: Size of the @val array
78 : *
79 : * Function reads an array of u8 properties with @propname from the device
80 : * firmware description and stores them to @val if found.
81 : *
82 : * It's recommended to call device_property_count_u8() instead of calling
83 : * this function with @val equals %NULL and @nval equals 0.
84 : *
85 : * Return: number of values if @val was %NULL,
86 : * %0 if the property was found (success),
87 : * %-EINVAL if given arguments are not valid,
88 : * %-ENODATA if the property does not have a value,
89 : * %-EPROTO if the property is not an array of numbers,
90 : * %-EOVERFLOW if the size of the property is not as expected.
91 : * %-ENXIO if no suitable firmware interface is present.
92 : */
93 0 : int device_property_read_u8_array(const struct device *dev, const char *propname,
94 : u8 *val, size_t nval)
95 : {
96 0 : return fwnode_property_read_u8_array(dev_fwnode(dev), propname, val, nval);
97 : }
98 : EXPORT_SYMBOL_GPL(device_property_read_u8_array);
99 :
100 : /**
101 : * device_property_read_u16_array - return a u16 array property of a device
102 : * @dev: Device to get the property of
103 : * @propname: Name of the property
104 : * @val: The values are stored here or %NULL to return the number of values
105 : * @nval: Size of the @val array
106 : *
107 : * Function reads an array of u16 properties with @propname from the device
108 : * firmware description and stores them to @val if found.
109 : *
110 : * It's recommended to call device_property_count_u16() instead of calling
111 : * this function with @val equals %NULL and @nval equals 0.
112 : *
113 : * Return: number of values if @val was %NULL,
114 : * %0 if the property was found (success),
115 : * %-EINVAL if given arguments are not valid,
116 : * %-ENODATA if the property does not have a value,
117 : * %-EPROTO if the property is not an array of numbers,
118 : * %-EOVERFLOW if the size of the property is not as expected.
119 : * %-ENXIO if no suitable firmware interface is present.
120 : */
121 0 : int device_property_read_u16_array(const struct device *dev, const char *propname,
122 : u16 *val, size_t nval)
123 : {
124 0 : return fwnode_property_read_u16_array(dev_fwnode(dev), propname, val, nval);
125 : }
126 : EXPORT_SYMBOL_GPL(device_property_read_u16_array);
127 :
128 : /**
129 : * device_property_read_u32_array - return a u32 array property of a device
130 : * @dev: Device to get the property of
131 : * @propname: Name of the property
132 : * @val: The values are stored here or %NULL to return the number of values
133 : * @nval: Size of the @val array
134 : *
135 : * Function reads an array of u32 properties with @propname from the device
136 : * firmware description and stores them to @val if found.
137 : *
138 : * It's recommended to call device_property_count_u32() instead of calling
139 : * this function with @val equals %NULL and @nval equals 0.
140 : *
141 : * Return: number of values if @val was %NULL,
142 : * %0 if the property was found (success),
143 : * %-EINVAL if given arguments are not valid,
144 : * %-ENODATA if the property does not have a value,
145 : * %-EPROTO if the property is not an array of numbers,
146 : * %-EOVERFLOW if the size of the property is not as expected.
147 : * %-ENXIO if no suitable firmware interface is present.
148 : */
149 0 : int device_property_read_u32_array(const struct device *dev, const char *propname,
150 : u32 *val, size_t nval)
151 : {
152 0 : return fwnode_property_read_u32_array(dev_fwnode(dev), propname, val, nval);
153 : }
154 : EXPORT_SYMBOL_GPL(device_property_read_u32_array);
155 :
156 : /**
157 : * device_property_read_u64_array - return a u64 array property of a device
158 : * @dev: Device to get the property of
159 : * @propname: Name of the property
160 : * @val: The values are stored here or %NULL to return the number of values
161 : * @nval: Size of the @val array
162 : *
163 : * Function reads an array of u64 properties with @propname from the device
164 : * firmware description and stores them to @val if found.
165 : *
166 : * It's recommended to call device_property_count_u64() instead of calling
167 : * this function with @val equals %NULL and @nval equals 0.
168 : *
169 : * Return: number of values if @val was %NULL,
170 : * %0 if the property was found (success),
171 : * %-EINVAL if given arguments are not valid,
172 : * %-ENODATA if the property does not have a value,
173 : * %-EPROTO if the property is not an array of numbers,
174 : * %-EOVERFLOW if the size of the property is not as expected.
175 : * %-ENXIO if no suitable firmware interface is present.
176 : */
177 0 : int device_property_read_u64_array(const struct device *dev, const char *propname,
178 : u64 *val, size_t nval)
179 : {
180 0 : return fwnode_property_read_u64_array(dev_fwnode(dev), propname, val, nval);
181 : }
182 : EXPORT_SYMBOL_GPL(device_property_read_u64_array);
183 :
184 : /**
185 : * device_property_read_string_array - return a string array property of device
186 : * @dev: Device to get the property of
187 : * @propname: Name of the property
188 : * @val: The values are stored here or %NULL to return the number of values
189 : * @nval: Size of the @val array
190 : *
191 : * Function reads an array of string properties with @propname from the device
192 : * firmware description and stores them to @val if found.
193 : *
194 : * It's recommended to call device_property_string_array_count() instead of calling
195 : * this function with @val equals %NULL and @nval equals 0.
196 : *
197 : * Return: number of values read on success if @val is non-NULL,
198 : * number of values available on success if @val is NULL,
199 : * %-EINVAL if given arguments are not valid,
200 : * %-ENODATA if the property does not have a value,
201 : * %-EPROTO or %-EILSEQ if the property is not an array of strings,
202 : * %-EOVERFLOW if the size of the property is not as expected.
203 : * %-ENXIO if no suitable firmware interface is present.
204 : */
205 0 : int device_property_read_string_array(const struct device *dev, const char *propname,
206 : const char **val, size_t nval)
207 : {
208 0 : return fwnode_property_read_string_array(dev_fwnode(dev), propname, val, nval);
209 : }
210 : EXPORT_SYMBOL_GPL(device_property_read_string_array);
211 :
212 : /**
213 : * device_property_read_string - return a string property of a device
214 : * @dev: Device to get the property of
215 : * @propname: Name of the property
216 : * @val: The value is stored here
217 : *
218 : * Function reads property @propname from the device firmware description and
219 : * stores the value into @val if found. The value is checked to be a string.
220 : *
221 : * Return: %0 if the property was found (success),
222 : * %-EINVAL if given arguments are not valid,
223 : * %-ENODATA if the property does not have a value,
224 : * %-EPROTO or %-EILSEQ if the property type is not a string.
225 : * %-ENXIO if no suitable firmware interface is present.
226 : */
227 0 : int device_property_read_string(const struct device *dev, const char *propname,
228 : const char **val)
229 : {
230 0 : return fwnode_property_read_string(dev_fwnode(dev), propname, val);
231 : }
232 : EXPORT_SYMBOL_GPL(device_property_read_string);
233 :
234 : /**
235 : * device_property_match_string - find a string in an array and return index
236 : * @dev: Device to get the property of
237 : * @propname: Name of the property holding the array
238 : * @string: String to look for
239 : *
240 : * Find a given string in a string array and if it is found return the
241 : * index back.
242 : *
243 : * Return: index, starting from %0, if the property was found (success),
244 : * %-EINVAL if given arguments are not valid,
245 : * %-ENODATA if the property does not have a value,
246 : * %-EPROTO if the property is not an array of strings,
247 : * %-ENXIO if no suitable firmware interface is present.
248 : */
249 0 : int device_property_match_string(const struct device *dev, const char *propname,
250 : const char *string)
251 : {
252 0 : return fwnode_property_match_string(dev_fwnode(dev), propname, string);
253 : }
254 : EXPORT_SYMBOL_GPL(device_property_match_string);
255 :
256 0 : static int fwnode_property_read_int_array(const struct fwnode_handle *fwnode,
257 : const char *propname,
258 : unsigned int elem_size, void *val,
259 : size_t nval)
260 : {
261 : int ret;
262 :
263 0 : if (IS_ERR_OR_NULL(fwnode))
264 : return -EINVAL;
265 :
266 0 : ret = fwnode_call_int_op(fwnode, property_read_int_array, propname,
267 : elem_size, val, nval);
268 0 : if (ret != -EINVAL)
269 : return ret;
270 :
271 0 : return fwnode_call_int_op(fwnode->secondary, property_read_int_array, propname,
272 : elem_size, val, nval);
273 : }
274 :
275 : /**
276 : * fwnode_property_read_u8_array - return a u8 array property of firmware node
277 : * @fwnode: Firmware node to get the property of
278 : * @propname: Name of the property
279 : * @val: The values are stored here or %NULL to return the number of values
280 : * @nval: Size of the @val array
281 : *
282 : * Read an array of u8 properties with @propname from @fwnode and stores them to
283 : * @val if found.
284 : *
285 : * It's recommended to call fwnode_property_count_u8() instead of calling
286 : * this function with @val equals %NULL and @nval equals 0.
287 : *
288 : * Return: number of values if @val was %NULL,
289 : * %0 if the property was found (success),
290 : * %-EINVAL if given arguments are not valid,
291 : * %-ENODATA if the property does not have a value,
292 : * %-EPROTO if the property is not an array of numbers,
293 : * %-EOVERFLOW if the size of the property is not as expected,
294 : * %-ENXIO if no suitable firmware interface is present.
295 : */
296 0 : int fwnode_property_read_u8_array(const struct fwnode_handle *fwnode,
297 : const char *propname, u8 *val, size_t nval)
298 : {
299 0 : return fwnode_property_read_int_array(fwnode, propname, sizeof(u8),
300 : val, nval);
301 : }
302 : EXPORT_SYMBOL_GPL(fwnode_property_read_u8_array);
303 :
304 : /**
305 : * fwnode_property_read_u16_array - return a u16 array property of firmware node
306 : * @fwnode: Firmware node to get the property of
307 : * @propname: Name of the property
308 : * @val: The values are stored here or %NULL to return the number of values
309 : * @nval: Size of the @val array
310 : *
311 : * Read an array of u16 properties with @propname from @fwnode and store them to
312 : * @val if found.
313 : *
314 : * It's recommended to call fwnode_property_count_u16() instead of calling
315 : * this function with @val equals %NULL and @nval equals 0.
316 : *
317 : * Return: number of values if @val was %NULL,
318 : * %0 if the property was found (success),
319 : * %-EINVAL if given arguments are not valid,
320 : * %-ENODATA if the property does not have a value,
321 : * %-EPROTO if the property is not an array of numbers,
322 : * %-EOVERFLOW if the size of the property is not as expected,
323 : * %-ENXIO if no suitable firmware interface is present.
324 : */
325 0 : int fwnode_property_read_u16_array(const struct fwnode_handle *fwnode,
326 : const char *propname, u16 *val, size_t nval)
327 : {
328 0 : return fwnode_property_read_int_array(fwnode, propname, sizeof(u16),
329 : val, nval);
330 : }
331 : EXPORT_SYMBOL_GPL(fwnode_property_read_u16_array);
332 :
333 : /**
334 : * fwnode_property_read_u32_array - return a u32 array property of firmware node
335 : * @fwnode: Firmware node to get the property of
336 : * @propname: Name of the property
337 : * @val: The values are stored here or %NULL to return the number of values
338 : * @nval: Size of the @val array
339 : *
340 : * Read an array of u32 properties with @propname from @fwnode store them to
341 : * @val if found.
342 : *
343 : * It's recommended to call fwnode_property_count_u32() instead of calling
344 : * this function with @val equals %NULL and @nval equals 0.
345 : *
346 : * Return: number of values if @val was %NULL,
347 : * %0 if the property was found (success),
348 : * %-EINVAL if given arguments are not valid,
349 : * %-ENODATA if the property does not have a value,
350 : * %-EPROTO if the property is not an array of numbers,
351 : * %-EOVERFLOW if the size of the property is not as expected,
352 : * %-ENXIO if no suitable firmware interface is present.
353 : */
354 0 : int fwnode_property_read_u32_array(const struct fwnode_handle *fwnode,
355 : const char *propname, u32 *val, size_t nval)
356 : {
357 0 : return fwnode_property_read_int_array(fwnode, propname, sizeof(u32),
358 : val, nval);
359 : }
360 : EXPORT_SYMBOL_GPL(fwnode_property_read_u32_array);
361 :
362 : /**
363 : * fwnode_property_read_u64_array - return a u64 array property firmware node
364 : * @fwnode: Firmware node to get the property of
365 : * @propname: Name of the property
366 : * @val: The values are stored here or %NULL to return the number of values
367 : * @nval: Size of the @val array
368 : *
369 : * Read an array of u64 properties with @propname from @fwnode and store them to
370 : * @val if found.
371 : *
372 : * It's recommended to call fwnode_property_count_u64() instead of calling
373 : * this function with @val equals %NULL and @nval equals 0.
374 : *
375 : * Return: number of values if @val was %NULL,
376 : * %0 if the property was found (success),
377 : * %-EINVAL if given arguments are not valid,
378 : * %-ENODATA if the property does not have a value,
379 : * %-EPROTO if the property is not an array of numbers,
380 : * %-EOVERFLOW if the size of the property is not as expected,
381 : * %-ENXIO if no suitable firmware interface is present.
382 : */
383 0 : int fwnode_property_read_u64_array(const struct fwnode_handle *fwnode,
384 : const char *propname, u64 *val, size_t nval)
385 : {
386 0 : return fwnode_property_read_int_array(fwnode, propname, sizeof(u64),
387 : val, nval);
388 : }
389 : EXPORT_SYMBOL_GPL(fwnode_property_read_u64_array);
390 :
391 : /**
392 : * fwnode_property_read_string_array - return string array property of a node
393 : * @fwnode: Firmware node to get the property of
394 : * @propname: Name of the property
395 : * @val: The values are stored here or %NULL to return the number of values
396 : * @nval: Size of the @val array
397 : *
398 : * Read an string list property @propname from the given firmware node and store
399 : * them to @val if found.
400 : *
401 : * It's recommended to call fwnode_property_string_array_count() instead of calling
402 : * this function with @val equals %NULL and @nval equals 0.
403 : *
404 : * Return: number of values read on success if @val is non-NULL,
405 : * number of values available on success if @val is NULL,
406 : * %-EINVAL if given arguments are not valid,
407 : * %-ENODATA if the property does not have a value,
408 : * %-EPROTO or %-EILSEQ if the property is not an array of strings,
409 : * %-EOVERFLOW if the size of the property is not as expected,
410 : * %-ENXIO if no suitable firmware interface is present.
411 : */
412 0 : int fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
413 : const char *propname, const char **val,
414 : size_t nval)
415 : {
416 : int ret;
417 :
418 0 : if (IS_ERR_OR_NULL(fwnode))
419 : return -EINVAL;
420 :
421 0 : ret = fwnode_call_int_op(fwnode, property_read_string_array, propname,
422 : val, nval);
423 0 : if (ret != -EINVAL)
424 : return ret;
425 :
426 0 : return fwnode_call_int_op(fwnode->secondary, property_read_string_array, propname,
427 : val, nval);
428 : }
429 : EXPORT_SYMBOL_GPL(fwnode_property_read_string_array);
430 :
431 : /**
432 : * fwnode_property_read_string - return a string property of a firmware node
433 : * @fwnode: Firmware node to get the property of
434 : * @propname: Name of the property
435 : * @val: The value is stored here
436 : *
437 : * Read property @propname from the given firmware node and store the value into
438 : * @val if found. The value is checked to be a string.
439 : *
440 : * Return: %0 if the property was found (success),
441 : * %-EINVAL if given arguments are not valid,
442 : * %-ENODATA if the property does not have a value,
443 : * %-EPROTO or %-EILSEQ if the property is not a string,
444 : * %-ENXIO if no suitable firmware interface is present.
445 : */
446 0 : int fwnode_property_read_string(const struct fwnode_handle *fwnode,
447 : const char *propname, const char **val)
448 : {
449 0 : int ret = fwnode_property_read_string_array(fwnode, propname, val, 1);
450 :
451 0 : return ret < 0 ? ret : 0;
452 : }
453 : EXPORT_SYMBOL_GPL(fwnode_property_read_string);
454 :
455 : /**
456 : * fwnode_property_match_string - find a string in an array and return index
457 : * @fwnode: Firmware node to get the property of
458 : * @propname: Name of the property holding the array
459 : * @string: String to look for
460 : *
461 : * Find a given string in a string array and if it is found return the
462 : * index back.
463 : *
464 : * Return: index, starting from %0, if the property was found (success),
465 : * %-EINVAL if given arguments are not valid,
466 : * %-ENODATA if the property does not have a value,
467 : * %-EPROTO if the property is not an array of strings,
468 : * %-ENXIO if no suitable firmware interface is present.
469 : */
470 0 : int fwnode_property_match_string(const struct fwnode_handle *fwnode,
471 : const char *propname, const char *string)
472 : {
473 : const char **values;
474 : int nval, ret;
475 :
476 0 : nval = fwnode_property_read_string_array(fwnode, propname, NULL, 0);
477 0 : if (nval < 0)
478 : return nval;
479 :
480 0 : if (nval == 0)
481 : return -ENODATA;
482 :
483 0 : values = kcalloc(nval, sizeof(*values), GFP_KERNEL);
484 0 : if (!values)
485 : return -ENOMEM;
486 :
487 0 : ret = fwnode_property_read_string_array(fwnode, propname, values, nval);
488 0 : if (ret < 0)
489 : goto out_free;
490 :
491 0 : ret = match_string(values, nval, string);
492 0 : if (ret < 0)
493 0 : ret = -ENODATA;
494 :
495 : out_free:
496 0 : kfree(values);
497 0 : return ret;
498 : }
499 : EXPORT_SYMBOL_GPL(fwnode_property_match_string);
500 :
501 : /**
502 : * fwnode_property_get_reference_args() - Find a reference with arguments
503 : * @fwnode: Firmware node where to look for the reference
504 : * @prop: The name of the property
505 : * @nargs_prop: The name of the property telling the number of
506 : * arguments in the referred node. NULL if @nargs is known,
507 : * otherwise @nargs is ignored. Only relevant on OF.
508 : * @nargs: Number of arguments. Ignored if @nargs_prop is non-NULL.
509 : * @index: Index of the reference, from zero onwards.
510 : * @args: Result structure with reference and integer arguments.
511 : *
512 : * Obtain a reference based on a named property in an fwnode, with
513 : * integer arguments.
514 : *
515 : * The caller is responsible for calling fwnode_handle_put() on the returned
516 : * @args->fwnode pointer.
517 : *
518 : * Return: %0 on success
519 : * %-ENOENT when the index is out of bounds, the index has an empty
520 : * reference or the property was not found
521 : * %-EINVAL on parse error
522 : */
523 0 : int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
524 : const char *prop, const char *nargs_prop,
525 : unsigned int nargs, unsigned int index,
526 : struct fwnode_reference_args *args)
527 : {
528 : int ret;
529 :
530 0 : if (IS_ERR_OR_NULL(fwnode))
531 : return -ENOENT;
532 :
533 0 : ret = fwnode_call_int_op(fwnode, get_reference_args, prop, nargs_prop,
534 : nargs, index, args);
535 0 : if (ret == 0)
536 : return ret;
537 :
538 0 : if (IS_ERR_OR_NULL(fwnode->secondary))
539 : return ret;
540 :
541 0 : return fwnode_call_int_op(fwnode->secondary, get_reference_args, prop, nargs_prop,
542 : nargs, index, args);
543 : }
544 : EXPORT_SYMBOL_GPL(fwnode_property_get_reference_args);
545 :
546 : /**
547 : * fwnode_find_reference - Find named reference to a fwnode_handle
548 : * @fwnode: Firmware node where to look for the reference
549 : * @name: The name of the reference
550 : * @index: Index of the reference
551 : *
552 : * @index can be used when the named reference holds a table of references.
553 : *
554 : * The caller is responsible for calling fwnode_handle_put() on the returned
555 : * fwnode pointer.
556 : *
557 : * Return: a pointer to the reference fwnode, when found. Otherwise,
558 : * returns an error pointer.
559 : */
560 0 : struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
561 : const char *name,
562 : unsigned int index)
563 : {
564 : struct fwnode_reference_args args;
565 : int ret;
566 :
567 0 : ret = fwnode_property_get_reference_args(fwnode, name, NULL, 0, index,
568 : &args);
569 0 : return ret ? ERR_PTR(ret) : args.fwnode;
570 : }
571 : EXPORT_SYMBOL_GPL(fwnode_find_reference);
572 :
573 : /**
574 : * fwnode_get_name - Return the name of a node
575 : * @fwnode: The firmware node
576 : *
577 : * Return: a pointer to the node name, or %NULL.
578 : */
579 0 : const char *fwnode_get_name(const struct fwnode_handle *fwnode)
580 : {
581 0 : return fwnode_call_ptr_op(fwnode, get_name);
582 : }
583 : EXPORT_SYMBOL_GPL(fwnode_get_name);
584 :
585 : /**
586 : * fwnode_get_name_prefix - Return the prefix of node for printing purposes
587 : * @fwnode: The firmware node
588 : *
589 : * Return: the prefix of a node, intended to be printed right before the node.
590 : * The prefix works also as a separator between the nodes.
591 : */
592 0 : const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
593 : {
594 0 : return fwnode_call_ptr_op(fwnode, get_name_prefix);
595 : }
596 :
597 : /**
598 : * fwnode_get_parent - Return parent firwmare node
599 : * @fwnode: Firmware whose parent is retrieved
600 : *
601 : * The caller is responsible for calling fwnode_handle_put() on the returned
602 : * fwnode pointer.
603 : *
604 : * Return: parent firmware node of the given node if possible or %NULL if no
605 : * parent was available.
606 : */
607 0 : struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode)
608 : {
609 0 : return fwnode_call_ptr_op(fwnode, get_parent);
610 : }
611 : EXPORT_SYMBOL_GPL(fwnode_get_parent);
612 :
613 : /**
614 : * fwnode_get_next_parent - Iterate to the node's parent
615 : * @fwnode: Firmware whose parent is retrieved
616 : *
617 : * This is like fwnode_get_parent() except that it drops the refcount
618 : * on the passed node, making it suitable for iterating through a
619 : * node's parents.
620 : *
621 : * The caller is responsible for calling fwnode_handle_put() on the returned
622 : * fwnode pointer. Note that this function also puts a reference to @fwnode
623 : * unconditionally.
624 : *
625 : * Return: parent firmware node of the given node if possible or %NULL if no
626 : * parent was available.
627 : */
628 0 : struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode)
629 : {
630 0 : struct fwnode_handle *parent = fwnode_get_parent(fwnode);
631 :
632 0 : fwnode_handle_put(fwnode);
633 :
634 0 : return parent;
635 : }
636 : EXPORT_SYMBOL_GPL(fwnode_get_next_parent);
637 :
638 : /**
639 : * fwnode_get_next_parent_dev - Find device of closest ancestor fwnode
640 : * @fwnode: firmware node
641 : *
642 : * Given a firmware node (@fwnode), this function finds its closest ancestor
643 : * firmware node that has a corresponding struct device and returns that struct
644 : * device.
645 : *
646 : * The caller is responsible for calling put_device() on the returned device
647 : * pointer.
648 : *
649 : * Return: a pointer to the device of the @fwnode's closest ancestor.
650 : */
651 0 : struct device *fwnode_get_next_parent_dev(const struct fwnode_handle *fwnode)
652 : {
653 : struct fwnode_handle *parent;
654 : struct device *dev;
655 :
656 0 : fwnode_for_each_parent_node(fwnode, parent) {
657 0 : dev = get_dev_from_fwnode(parent);
658 0 : if (dev) {
659 : fwnode_handle_put(parent);
660 : return dev;
661 : }
662 : }
663 : return NULL;
664 : }
665 :
666 : /**
667 : * fwnode_count_parents - Return the number of parents a node has
668 : * @fwnode: The node the parents of which are to be counted
669 : *
670 : * Return: the number of parents a node has.
671 : */
672 0 : unsigned int fwnode_count_parents(const struct fwnode_handle *fwnode)
673 : {
674 : struct fwnode_handle *parent;
675 0 : unsigned int count = 0;
676 :
677 0 : fwnode_for_each_parent_node(fwnode, parent)
678 0 : count++;
679 :
680 0 : return count;
681 : }
682 : EXPORT_SYMBOL_GPL(fwnode_count_parents);
683 :
684 : /**
685 : * fwnode_get_nth_parent - Return an nth parent of a node
686 : * @fwnode: The node the parent of which is requested
687 : * @depth: Distance of the parent from the node
688 : *
689 : * The caller is responsible for calling fwnode_handle_put() on the returned
690 : * fwnode pointer.
691 : *
692 : * Return: the nth parent of a node. If there is no parent at the requested
693 : * @depth, %NULL is returned. If @depth is 0, the functionality is equivalent to
694 : * fwnode_handle_get(). For @depth == 1, it is fwnode_get_parent() and so on.
695 : */
696 0 : struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwnode,
697 : unsigned int depth)
698 : {
699 : struct fwnode_handle *parent;
700 :
701 0 : if (depth == 0)
702 0 : return fwnode_handle_get(fwnode);
703 :
704 0 : fwnode_for_each_parent_node(fwnode, parent) {
705 0 : if (--depth == 0)
706 : return parent;
707 : }
708 : return NULL;
709 : }
710 : EXPORT_SYMBOL_GPL(fwnode_get_nth_parent);
711 :
712 : /**
713 : * fwnode_is_ancestor_of - Test if @ancestor is ancestor of @child
714 : * @ancestor: Firmware which is tested for being an ancestor
715 : * @child: Firmware which is tested for being the child
716 : *
717 : * A node is considered an ancestor of itself too.
718 : *
719 : * Return: true if @ancestor is an ancestor of @child. Otherwise, returns false.
720 : */
721 0 : bool fwnode_is_ancestor_of(const struct fwnode_handle *ancestor, const struct fwnode_handle *child)
722 : {
723 : struct fwnode_handle *parent;
724 :
725 0 : if (IS_ERR_OR_NULL(ancestor))
726 : return false;
727 :
728 0 : if (child == ancestor)
729 : return true;
730 :
731 0 : fwnode_for_each_parent_node(child, parent) {
732 0 : if (parent == ancestor) {
733 : fwnode_handle_put(parent);
734 : return true;
735 : }
736 : }
737 : return false;
738 : }
739 :
740 : /**
741 : * fwnode_get_next_child_node - Return the next child node handle for a node
742 : * @fwnode: Firmware node to find the next child node for.
743 : * @child: Handle to one of the node's child nodes or a %NULL handle.
744 : *
745 : * The caller is responsible for calling fwnode_handle_put() on the returned
746 : * fwnode pointer. Note that this function also puts a reference to @child
747 : * unconditionally.
748 : */
749 : struct fwnode_handle *
750 0 : fwnode_get_next_child_node(const struct fwnode_handle *fwnode,
751 : struct fwnode_handle *child)
752 : {
753 0 : return fwnode_call_ptr_op(fwnode, get_next_child_node, child);
754 : }
755 : EXPORT_SYMBOL_GPL(fwnode_get_next_child_node);
756 :
757 : /**
758 : * fwnode_get_next_available_child_node - Return the next available child node handle for a node
759 : * @fwnode: Firmware node to find the next child node for.
760 : * @child: Handle to one of the node's child nodes or a %NULL handle.
761 : *
762 : * The caller is responsible for calling fwnode_handle_put() on the returned
763 : * fwnode pointer. Note that this function also puts a reference to @child
764 : * unconditionally.
765 : */
766 : struct fwnode_handle *
767 0 : fwnode_get_next_available_child_node(const struct fwnode_handle *fwnode,
768 : struct fwnode_handle *child)
769 : {
770 0 : struct fwnode_handle *next_child = child;
771 :
772 0 : if (IS_ERR_OR_NULL(fwnode))
773 : return NULL;
774 :
775 : do {
776 0 : next_child = fwnode_get_next_child_node(fwnode, next_child);
777 0 : if (!next_child)
778 : return NULL;
779 0 : } while (!fwnode_device_is_available(next_child));
780 :
781 : return next_child;
782 : }
783 : EXPORT_SYMBOL_GPL(fwnode_get_next_available_child_node);
784 :
785 : /**
786 : * device_get_next_child_node - Return the next child node handle for a device
787 : * @dev: Device to find the next child node for.
788 : * @child: Handle to one of the device's child nodes or a %NULL handle.
789 : *
790 : * The caller is responsible for calling fwnode_handle_put() on the returned
791 : * fwnode pointer. Note that this function also puts a reference to @child
792 : * unconditionally.
793 : */
794 0 : struct fwnode_handle *device_get_next_child_node(const struct device *dev,
795 : struct fwnode_handle *child)
796 : {
797 0 : const struct fwnode_handle *fwnode = dev_fwnode(dev);
798 : struct fwnode_handle *next;
799 :
800 0 : if (IS_ERR_OR_NULL(fwnode))
801 : return NULL;
802 :
803 : /* Try to find a child in primary fwnode */
804 0 : next = fwnode_get_next_child_node(fwnode, child);
805 0 : if (next)
806 : return next;
807 :
808 : /* When no more children in primary, continue with secondary */
809 0 : return fwnode_get_next_child_node(fwnode->secondary, child);
810 : }
811 : EXPORT_SYMBOL_GPL(device_get_next_child_node);
812 :
813 : /**
814 : * fwnode_get_named_child_node - Return first matching named child node handle
815 : * @fwnode: Firmware node to find the named child node for.
816 : * @childname: String to match child node name against.
817 : *
818 : * The caller is responsible for calling fwnode_handle_put() on the returned
819 : * fwnode pointer.
820 : */
821 : struct fwnode_handle *
822 0 : fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
823 : const char *childname)
824 : {
825 0 : return fwnode_call_ptr_op(fwnode, get_named_child_node, childname);
826 : }
827 : EXPORT_SYMBOL_GPL(fwnode_get_named_child_node);
828 :
829 : /**
830 : * device_get_named_child_node - Return first matching named child node handle
831 : * @dev: Device to find the named child node for.
832 : * @childname: String to match child node name against.
833 : *
834 : * The caller is responsible for calling fwnode_handle_put() on the returned
835 : * fwnode pointer.
836 : */
837 0 : struct fwnode_handle *device_get_named_child_node(const struct device *dev,
838 : const char *childname)
839 : {
840 0 : return fwnode_get_named_child_node(dev_fwnode(dev), childname);
841 : }
842 : EXPORT_SYMBOL_GPL(device_get_named_child_node);
843 :
844 : /**
845 : * fwnode_handle_get - Obtain a reference to a device node
846 : * @fwnode: Pointer to the device node to obtain the reference to.
847 : *
848 : * The caller is responsible for calling fwnode_handle_put() on the returned
849 : * fwnode pointer.
850 : *
851 : * Return: the fwnode handle.
852 : */
853 0 : struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode)
854 : {
855 0 : if (!fwnode_has_op(fwnode, get))
856 : return fwnode;
857 :
858 0 : return fwnode_call_ptr_op(fwnode, get);
859 : }
860 : EXPORT_SYMBOL_GPL(fwnode_handle_get);
861 :
862 : /**
863 : * fwnode_handle_put - Drop reference to a device node
864 : * @fwnode: Pointer to the device node to drop the reference to.
865 : *
866 : * This has to be used when terminating device_for_each_child_node() iteration
867 : * with break or return to prevent stale device node references from being left
868 : * behind.
869 : */
870 0 : void fwnode_handle_put(struct fwnode_handle *fwnode)
871 : {
872 0 : fwnode_call_void_op(fwnode, put);
873 0 : }
874 : EXPORT_SYMBOL_GPL(fwnode_handle_put);
875 :
876 : /**
877 : * fwnode_device_is_available - check if a device is available for use
878 : * @fwnode: Pointer to the fwnode of the device.
879 : *
880 : * Return: true if device is available for use. Otherwise, returns false.
881 : *
882 : * For fwnode node types that don't implement the .device_is_available()
883 : * operation, this function returns true.
884 : */
885 0 : bool fwnode_device_is_available(const struct fwnode_handle *fwnode)
886 : {
887 0 : if (IS_ERR_OR_NULL(fwnode))
888 : return false;
889 :
890 0 : if (!fwnode_has_op(fwnode, device_is_available))
891 : return true;
892 :
893 0 : return fwnode_call_bool_op(fwnode, device_is_available);
894 : }
895 : EXPORT_SYMBOL_GPL(fwnode_device_is_available);
896 :
897 : /**
898 : * device_get_child_node_count - return the number of child nodes for device
899 : * @dev: Device to cound the child nodes for
900 : *
901 : * Return: the number of child nodes for a given device.
902 : */
903 0 : unsigned int device_get_child_node_count(const struct device *dev)
904 : {
905 : struct fwnode_handle *child;
906 0 : unsigned int count = 0;
907 :
908 0 : device_for_each_child_node(dev, child)
909 0 : count++;
910 :
911 0 : return count;
912 : }
913 : EXPORT_SYMBOL_GPL(device_get_child_node_count);
914 :
915 0 : bool device_dma_supported(const struct device *dev)
916 : {
917 0 : return fwnode_call_bool_op(dev_fwnode(dev), device_dma_supported);
918 : }
919 : EXPORT_SYMBOL_GPL(device_dma_supported);
920 :
921 0 : enum dev_dma_attr device_get_dma_attr(const struct device *dev)
922 : {
923 0 : if (!fwnode_has_op(dev_fwnode(dev), device_get_dma_attr))
924 : return DEV_DMA_NOT_SUPPORTED;
925 :
926 0 : return fwnode_call_int_op(dev_fwnode(dev), device_get_dma_attr);
927 : }
928 : EXPORT_SYMBOL_GPL(device_get_dma_attr);
929 :
930 : /**
931 : * fwnode_get_phy_mode - Get phy mode for given firmware node
932 : * @fwnode: Pointer to the given node
933 : *
934 : * The function gets phy interface string from property 'phy-mode' or
935 : * 'phy-connection-type', and return its index in phy_modes table, or errno in
936 : * error case.
937 : */
938 0 : int fwnode_get_phy_mode(const struct fwnode_handle *fwnode)
939 : {
940 : const char *pm;
941 : int err, i;
942 :
943 0 : err = fwnode_property_read_string(fwnode, "phy-mode", &pm);
944 0 : if (err < 0)
945 0 : err = fwnode_property_read_string(fwnode,
946 : "phy-connection-type", &pm);
947 0 : if (err < 0)
948 : return err;
949 :
950 0 : for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
951 0 : if (!strcasecmp(pm, phy_modes(i)))
952 : return i;
953 :
954 : return -ENODEV;
955 : }
956 : EXPORT_SYMBOL_GPL(fwnode_get_phy_mode);
957 :
958 : /**
959 : * device_get_phy_mode - Get phy mode for given device
960 : * @dev: Pointer to the given device
961 : *
962 : * The function gets phy interface string from property 'phy-mode' or
963 : * 'phy-connection-type', and return its index in phy_modes table, or errno in
964 : * error case.
965 : */
966 0 : int device_get_phy_mode(struct device *dev)
967 : {
968 0 : return fwnode_get_phy_mode(dev_fwnode(dev));
969 : }
970 : EXPORT_SYMBOL_GPL(device_get_phy_mode);
971 :
972 : /**
973 : * fwnode_iomap - Maps the memory mapped IO for a given fwnode
974 : * @fwnode: Pointer to the firmware node
975 : * @index: Index of the IO range
976 : *
977 : * Return: a pointer to the mapped memory.
978 : */
979 0 : void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index)
980 : {
981 0 : return fwnode_call_ptr_op(fwnode, iomap, index);
982 : }
983 : EXPORT_SYMBOL(fwnode_iomap);
984 :
985 : /**
986 : * fwnode_irq_get - Get IRQ directly from a fwnode
987 : * @fwnode: Pointer to the firmware node
988 : * @index: Zero-based index of the IRQ
989 : *
990 : * Return: Linux IRQ number on success. Negative errno on failure.
991 : */
992 0 : int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index)
993 : {
994 : int ret;
995 :
996 0 : ret = fwnode_call_int_op(fwnode, irq_get, index);
997 : /* We treat mapping errors as invalid case */
998 0 : if (ret == 0)
999 : return -EINVAL;
1000 :
1001 0 : return ret;
1002 : }
1003 : EXPORT_SYMBOL(fwnode_irq_get);
1004 :
1005 : /**
1006 : * fwnode_irq_get_byname - Get IRQ from a fwnode using its name
1007 : * @fwnode: Pointer to the firmware node
1008 : * @name: IRQ name
1009 : *
1010 : * Description:
1011 : * Find a match to the string @name in the 'interrupt-names' string array
1012 : * in _DSD for ACPI, or of_node for Device Tree. Then get the Linux IRQ
1013 : * number of the IRQ resource corresponding to the index of the matched
1014 : * string.
1015 : *
1016 : * Return: Linux IRQ number on success, or negative errno otherwise.
1017 : */
1018 0 : int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name)
1019 : {
1020 : int index;
1021 :
1022 0 : if (!name)
1023 : return -EINVAL;
1024 :
1025 0 : index = fwnode_property_match_string(fwnode, "interrupt-names", name);
1026 0 : if (index < 0)
1027 : return index;
1028 :
1029 0 : return fwnode_irq_get(fwnode, index);
1030 : }
1031 : EXPORT_SYMBOL(fwnode_irq_get_byname);
1032 :
1033 : /**
1034 : * fwnode_graph_get_next_endpoint - Get next endpoint firmware node
1035 : * @fwnode: Pointer to the parent firmware node
1036 : * @prev: Previous endpoint node or %NULL to get the first
1037 : *
1038 : * The caller is responsible for calling fwnode_handle_put() on the returned
1039 : * fwnode pointer. Note that this function also puts a reference to @prev
1040 : * unconditionally.
1041 : *
1042 : * Return: an endpoint firmware node pointer or %NULL if no more endpoints
1043 : * are available.
1044 : */
1045 : struct fwnode_handle *
1046 0 : fwnode_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
1047 : struct fwnode_handle *prev)
1048 : {
1049 0 : struct fwnode_handle *ep, *port_parent = NULL;
1050 : const struct fwnode_handle *parent;
1051 :
1052 : /*
1053 : * If this function is in a loop and the previous iteration returned
1054 : * an endpoint from fwnode->secondary, then we need to use the secondary
1055 : * as parent rather than @fwnode.
1056 : */
1057 0 : if (prev) {
1058 0 : port_parent = fwnode_graph_get_port_parent(prev);
1059 0 : parent = port_parent;
1060 : } else {
1061 : parent = fwnode;
1062 : }
1063 0 : if (IS_ERR_OR_NULL(parent))
1064 : return NULL;
1065 :
1066 0 : ep = fwnode_call_ptr_op(parent, graph_get_next_endpoint, prev);
1067 0 : if (ep)
1068 : goto out_put_port_parent;
1069 :
1070 0 : ep = fwnode_graph_get_next_endpoint(parent->secondary, NULL);
1071 :
1072 : out_put_port_parent:
1073 : fwnode_handle_put(port_parent);
1074 : return ep;
1075 : }
1076 : EXPORT_SYMBOL_GPL(fwnode_graph_get_next_endpoint);
1077 :
1078 : /**
1079 : * fwnode_graph_get_port_parent - Return the device fwnode of a port endpoint
1080 : * @endpoint: Endpoint firmware node of the port
1081 : *
1082 : * The caller is responsible for calling fwnode_handle_put() on the returned
1083 : * fwnode pointer.
1084 : *
1085 : * Return: the firmware node of the device the @endpoint belongs to.
1086 : */
1087 : struct fwnode_handle *
1088 0 : fwnode_graph_get_port_parent(const struct fwnode_handle *endpoint)
1089 : {
1090 : struct fwnode_handle *port, *parent;
1091 :
1092 0 : port = fwnode_get_parent(endpoint);
1093 0 : parent = fwnode_call_ptr_op(port, graph_get_port_parent);
1094 :
1095 0 : fwnode_handle_put(port);
1096 :
1097 0 : return parent;
1098 : }
1099 : EXPORT_SYMBOL_GPL(fwnode_graph_get_port_parent);
1100 :
1101 : /**
1102 : * fwnode_graph_get_remote_port_parent - Return fwnode of a remote device
1103 : * @fwnode: Endpoint firmware node pointing to the remote endpoint
1104 : *
1105 : * Extracts firmware node of a remote device the @fwnode points to.
1106 : *
1107 : * The caller is responsible for calling fwnode_handle_put() on the returned
1108 : * fwnode pointer.
1109 : */
1110 : struct fwnode_handle *
1111 0 : fwnode_graph_get_remote_port_parent(const struct fwnode_handle *fwnode)
1112 : {
1113 : struct fwnode_handle *endpoint, *parent;
1114 :
1115 0 : endpoint = fwnode_graph_get_remote_endpoint(fwnode);
1116 0 : parent = fwnode_graph_get_port_parent(endpoint);
1117 :
1118 0 : fwnode_handle_put(endpoint);
1119 :
1120 0 : return parent;
1121 : }
1122 : EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_port_parent);
1123 :
1124 : /**
1125 : * fwnode_graph_get_remote_port - Return fwnode of a remote port
1126 : * @fwnode: Endpoint firmware node pointing to the remote endpoint
1127 : *
1128 : * Extracts firmware node of a remote port the @fwnode points to.
1129 : *
1130 : * The caller is responsible for calling fwnode_handle_put() on the returned
1131 : * fwnode pointer.
1132 : */
1133 : struct fwnode_handle *
1134 0 : fwnode_graph_get_remote_port(const struct fwnode_handle *fwnode)
1135 : {
1136 0 : return fwnode_get_next_parent(fwnode_graph_get_remote_endpoint(fwnode));
1137 : }
1138 : EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_port);
1139 :
1140 : /**
1141 : * fwnode_graph_get_remote_endpoint - Return fwnode of a remote endpoint
1142 : * @fwnode: Endpoint firmware node pointing to the remote endpoint
1143 : *
1144 : * Extracts firmware node of a remote endpoint the @fwnode points to.
1145 : *
1146 : * The caller is responsible for calling fwnode_handle_put() on the returned
1147 : * fwnode pointer.
1148 : */
1149 : struct fwnode_handle *
1150 0 : fwnode_graph_get_remote_endpoint(const struct fwnode_handle *fwnode)
1151 : {
1152 0 : return fwnode_call_ptr_op(fwnode, graph_get_remote_endpoint);
1153 : }
1154 : EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_endpoint);
1155 :
1156 0 : static bool fwnode_graph_remote_available(struct fwnode_handle *ep)
1157 : {
1158 : struct fwnode_handle *dev_node;
1159 : bool available;
1160 :
1161 0 : dev_node = fwnode_graph_get_remote_port_parent(ep);
1162 0 : available = fwnode_device_is_available(dev_node);
1163 0 : fwnode_handle_put(dev_node);
1164 :
1165 0 : return available;
1166 : }
1167 :
1168 : /**
1169 : * fwnode_graph_get_endpoint_by_id - get endpoint by port and endpoint numbers
1170 : * @fwnode: parent fwnode_handle containing the graph
1171 : * @port: identifier of the port node
1172 : * @endpoint: identifier of the endpoint node under the port node
1173 : * @flags: fwnode lookup flags
1174 : *
1175 : * The caller is responsible for calling fwnode_handle_put() on the returned
1176 : * fwnode pointer.
1177 : *
1178 : * Return: the fwnode handle of the local endpoint corresponding the port and
1179 : * endpoint IDs or %NULL if not found.
1180 : *
1181 : * If FWNODE_GRAPH_ENDPOINT_NEXT is passed in @flags and the specified endpoint
1182 : * has not been found, look for the closest endpoint ID greater than the
1183 : * specified one and return the endpoint that corresponds to it, if present.
1184 : *
1185 : * Does not return endpoints that belong to disabled devices or endpoints that
1186 : * are unconnected, unless FWNODE_GRAPH_DEVICE_DISABLED is passed in @flags.
1187 : */
1188 : struct fwnode_handle *
1189 0 : fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode,
1190 : u32 port, u32 endpoint, unsigned long flags)
1191 : {
1192 0 : struct fwnode_handle *ep, *best_ep = NULL;
1193 0 : unsigned int best_ep_id = 0;
1194 0 : bool endpoint_next = flags & FWNODE_GRAPH_ENDPOINT_NEXT;
1195 0 : bool enabled_only = !(flags & FWNODE_GRAPH_DEVICE_DISABLED);
1196 :
1197 0 : fwnode_graph_for_each_endpoint(fwnode, ep) {
1198 0 : struct fwnode_endpoint fwnode_ep = { 0 };
1199 : int ret;
1200 :
1201 0 : if (enabled_only && !fwnode_graph_remote_available(ep))
1202 0 : continue;
1203 :
1204 0 : ret = fwnode_graph_parse_endpoint(ep, &fwnode_ep);
1205 0 : if (ret < 0)
1206 0 : continue;
1207 :
1208 0 : if (fwnode_ep.port != port)
1209 0 : continue;
1210 :
1211 0 : if (fwnode_ep.id == endpoint)
1212 0 : return ep;
1213 :
1214 0 : if (!endpoint_next)
1215 0 : continue;
1216 :
1217 : /*
1218 : * If the endpoint that has just been found is not the first
1219 : * matching one and the ID of the one found previously is closer
1220 : * to the requested endpoint ID, skip it.
1221 : */
1222 0 : if (fwnode_ep.id < endpoint ||
1223 0 : (best_ep && best_ep_id < fwnode_ep.id))
1224 0 : continue;
1225 :
1226 0 : fwnode_handle_put(best_ep);
1227 0 : best_ep = fwnode_handle_get(ep);
1228 0 : best_ep_id = fwnode_ep.id;
1229 : }
1230 :
1231 : return best_ep;
1232 : }
1233 : EXPORT_SYMBOL_GPL(fwnode_graph_get_endpoint_by_id);
1234 :
1235 : /**
1236 : * fwnode_graph_get_endpoint_count - Count endpoints on a device node
1237 : * @fwnode: The node related to a device
1238 : * @flags: fwnode lookup flags
1239 : * Count endpoints in a device node.
1240 : *
1241 : * If FWNODE_GRAPH_DEVICE_DISABLED flag is specified, also unconnected endpoints
1242 : * and endpoints connected to disabled devices are counted.
1243 : */
1244 0 : unsigned int fwnode_graph_get_endpoint_count(const struct fwnode_handle *fwnode,
1245 : unsigned long flags)
1246 : {
1247 : struct fwnode_handle *ep;
1248 0 : unsigned int count = 0;
1249 :
1250 0 : fwnode_graph_for_each_endpoint(fwnode, ep) {
1251 0 : if (flags & FWNODE_GRAPH_DEVICE_DISABLED ||
1252 0 : fwnode_graph_remote_available(ep))
1253 0 : count++;
1254 : }
1255 :
1256 0 : return count;
1257 : }
1258 : EXPORT_SYMBOL_GPL(fwnode_graph_get_endpoint_count);
1259 :
1260 : /**
1261 : * fwnode_graph_parse_endpoint - parse common endpoint node properties
1262 : * @fwnode: pointer to endpoint fwnode_handle
1263 : * @endpoint: pointer to the fwnode endpoint data structure
1264 : *
1265 : * Parse @fwnode representing a graph endpoint node and store the
1266 : * information in @endpoint. The caller must hold a reference to
1267 : * @fwnode.
1268 : */
1269 0 : int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
1270 : struct fwnode_endpoint *endpoint)
1271 : {
1272 0 : memset(endpoint, 0, sizeof(*endpoint));
1273 :
1274 0 : return fwnode_call_int_op(fwnode, graph_parse_endpoint, endpoint);
1275 : }
1276 : EXPORT_SYMBOL(fwnode_graph_parse_endpoint);
1277 :
1278 0 : const void *device_get_match_data(const struct device *dev)
1279 : {
1280 0 : return fwnode_call_ptr_op(dev_fwnode(dev), device_get_match_data, dev);
1281 : }
1282 : EXPORT_SYMBOL_GPL(device_get_match_data);
1283 :
1284 0 : static unsigned int fwnode_graph_devcon_matches(const struct fwnode_handle *fwnode,
1285 : const char *con_id, void *data,
1286 : devcon_match_fn_t match,
1287 : void **matches,
1288 : unsigned int matches_len)
1289 : {
1290 : struct fwnode_handle *node;
1291 : struct fwnode_handle *ep;
1292 0 : unsigned int count = 0;
1293 : void *ret;
1294 :
1295 0 : fwnode_graph_for_each_endpoint(fwnode, ep) {
1296 0 : if (matches && count >= matches_len) {
1297 : fwnode_handle_put(ep);
1298 : break;
1299 : }
1300 :
1301 0 : node = fwnode_graph_get_remote_port_parent(ep);
1302 0 : if (!fwnode_device_is_available(node)) {
1303 0 : fwnode_handle_put(node);
1304 0 : continue;
1305 : }
1306 :
1307 0 : ret = match(node, con_id, data);
1308 0 : fwnode_handle_put(node);
1309 0 : if (ret) {
1310 0 : if (matches)
1311 0 : matches[count] = ret;
1312 0 : count++;
1313 : }
1314 : }
1315 0 : return count;
1316 : }
1317 :
1318 0 : static unsigned int fwnode_devcon_matches(const struct fwnode_handle *fwnode,
1319 : const char *con_id, void *data,
1320 : devcon_match_fn_t match,
1321 : void **matches,
1322 : unsigned int matches_len)
1323 : {
1324 : struct fwnode_handle *node;
1325 0 : unsigned int count = 0;
1326 : unsigned int i;
1327 : void *ret;
1328 :
1329 0 : for (i = 0; ; i++) {
1330 0 : if (matches && count >= matches_len)
1331 : break;
1332 :
1333 0 : node = fwnode_find_reference(fwnode, con_id, i);
1334 0 : if (IS_ERR(node))
1335 : break;
1336 :
1337 0 : ret = match(node, NULL, data);
1338 0 : fwnode_handle_put(node);
1339 0 : if (ret) {
1340 0 : if (matches)
1341 0 : matches[count] = ret;
1342 0 : count++;
1343 : }
1344 : }
1345 :
1346 0 : return count;
1347 : }
1348 :
1349 : /**
1350 : * fwnode_connection_find_match - Find connection from a device node
1351 : * @fwnode: Device node with the connection
1352 : * @con_id: Identifier for the connection
1353 : * @data: Data for the match function
1354 : * @match: Function to check and convert the connection description
1355 : *
1356 : * Find a connection with unique identifier @con_id between @fwnode and another
1357 : * device node. @match will be used to convert the connection description to
1358 : * data the caller is expecting to be returned.
1359 : */
1360 0 : void *fwnode_connection_find_match(const struct fwnode_handle *fwnode,
1361 : const char *con_id, void *data,
1362 : devcon_match_fn_t match)
1363 : {
1364 : unsigned int count;
1365 : void *ret;
1366 :
1367 0 : if (!fwnode || !match)
1368 : return NULL;
1369 :
1370 0 : count = fwnode_graph_devcon_matches(fwnode, con_id, data, match, &ret, 1);
1371 0 : if (count)
1372 0 : return ret;
1373 :
1374 0 : count = fwnode_devcon_matches(fwnode, con_id, data, match, &ret, 1);
1375 0 : return count ? ret : NULL;
1376 : }
1377 : EXPORT_SYMBOL_GPL(fwnode_connection_find_match);
1378 :
1379 : /**
1380 : * fwnode_connection_find_matches - Find connections from a device node
1381 : * @fwnode: Device node with the connection
1382 : * @con_id: Identifier for the connection
1383 : * @data: Data for the match function
1384 : * @match: Function to check and convert the connection description
1385 : * @matches: (Optional) array of pointers to fill with matches
1386 : * @matches_len: Length of @matches
1387 : *
1388 : * Find up to @matches_len connections with unique identifier @con_id between
1389 : * @fwnode and other device nodes. @match will be used to convert the
1390 : * connection description to data the caller is expecting to be returned
1391 : * through the @matches array.
1392 : *
1393 : * If @matches is %NULL @matches_len is ignored and the total number of resolved
1394 : * matches is returned.
1395 : *
1396 : * Return: Number of matches resolved, or negative errno.
1397 : */
1398 0 : int fwnode_connection_find_matches(const struct fwnode_handle *fwnode,
1399 : const char *con_id, void *data,
1400 : devcon_match_fn_t match,
1401 : void **matches, unsigned int matches_len)
1402 : {
1403 : unsigned int count_graph;
1404 : unsigned int count_ref;
1405 :
1406 0 : if (!fwnode || !match)
1407 : return -EINVAL;
1408 :
1409 0 : count_graph = fwnode_graph_devcon_matches(fwnode, con_id, data, match,
1410 : matches, matches_len);
1411 :
1412 0 : if (matches) {
1413 0 : matches += count_graph;
1414 0 : matches_len -= count_graph;
1415 : }
1416 :
1417 0 : count_ref = fwnode_devcon_matches(fwnode, con_id, data, match,
1418 : matches, matches_len);
1419 :
1420 0 : return count_graph + count_ref;
1421 : }
1422 : EXPORT_SYMBOL_GPL(fwnode_connection_find_matches);
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