1 // SPDX-License-Identifier: GPL-2.0
3 * property.c - Unified device property interface.
5 * Copyright (C) 2014, Intel Corporation
6 * Authors: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
7 * Mika Westerberg <mika.westerberg@linux.intel.com>
10 #include <linux/acpi.h>
11 #include <linux/export.h>
12 #include <linux/kernel.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>
20 struct fwnode_handle *__dev_fwnode(struct device *dev)
22 return IS_ENABLED(CONFIG_OF) && dev->of_node ?
23 of_fwnode_handle(dev->of_node) : dev->fwnode;
25 EXPORT_SYMBOL_GPL(__dev_fwnode);
27 const struct fwnode_handle *__dev_fwnode_const(const struct device *dev)
29 return IS_ENABLED(CONFIG_OF) && dev->of_node ?
30 of_fwnode_handle(dev->of_node) : dev->fwnode;
32 EXPORT_SYMBOL_GPL(__dev_fwnode_const);
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
39 * Check if property @propname is present in the device firmware description.
41 bool device_property_present(struct device *dev, const char *propname)
43 return fwnode_property_present(dev_fwnode(dev), propname);
45 EXPORT_SYMBOL_GPL(device_property_present);
48 * fwnode_property_present - check if a property of a firmware node is present
49 * @fwnode: Firmware node whose property to check
50 * @propname: Name of the property
52 bool fwnode_property_present(const struct fwnode_handle *fwnode,
57 if (IS_ERR_OR_NULL(fwnode))
60 ret = fwnode_call_bool_op(fwnode, property_present, propname);
64 return fwnode_call_bool_op(fwnode->secondary, property_present, propname);
66 EXPORT_SYMBOL_GPL(fwnode_property_present);
69 * device_property_read_u8_array - return a u8 array property of a device
70 * @dev: Device to get the property of
71 * @propname: Name of the property
72 * @val: The values are stored here or %NULL to return the number of values
73 * @nval: Size of the @val array
75 * Function reads an array of u8 properties with @propname from the device
76 * firmware description and stores them to @val if found.
78 * It's recommended to call device_property_count_u8() instead of calling
79 * this function with @val equals %NULL and @nval equals 0.
81 * Return: number of values if @val was %NULL,
82 * %0 if the property was found (success),
83 * %-EINVAL if given arguments are not valid,
84 * %-ENODATA if the property does not have a value,
85 * %-EPROTO if the property is not an array of numbers,
86 * %-EOVERFLOW if the size of the property is not as expected.
87 * %-ENXIO if no suitable firmware interface is present.
89 int device_property_read_u8_array(struct device *dev, const char *propname,
92 return fwnode_property_read_u8_array(dev_fwnode(dev), propname, val, nval);
94 EXPORT_SYMBOL_GPL(device_property_read_u8_array);
97 * device_property_read_u16_array - return a u16 array property of a device
98 * @dev: Device to get the property of
99 * @propname: Name of the property
100 * @val: The values are stored here or %NULL to return the number of values
101 * @nval: Size of the @val array
103 * Function reads an array of u16 properties with @propname from the device
104 * firmware description and stores them to @val if found.
106 * It's recommended to call device_property_count_u16() instead of calling
107 * this function with @val equals %NULL and @nval equals 0.
109 * Return: number of values if @val was %NULL,
110 * %0 if the property was found (success),
111 * %-EINVAL if given arguments are not valid,
112 * %-ENODATA if the property does not have a value,
113 * %-EPROTO if the property is not an array of numbers,
114 * %-EOVERFLOW if the size of the property is not as expected.
115 * %-ENXIO if no suitable firmware interface is present.
117 int device_property_read_u16_array(struct device *dev, const char *propname,
118 u16 *val, size_t nval)
120 return fwnode_property_read_u16_array(dev_fwnode(dev), propname, val, nval);
122 EXPORT_SYMBOL_GPL(device_property_read_u16_array);
125 * device_property_read_u32_array - return a u32 array property of a device
126 * @dev: Device to get the property of
127 * @propname: Name of the property
128 * @val: The values are stored here or %NULL to return the number of values
129 * @nval: Size of the @val array
131 * Function reads an array of u32 properties with @propname from the device
132 * firmware description and stores them to @val if found.
134 * It's recommended to call device_property_count_u32() instead of calling
135 * this function with @val equals %NULL and @nval equals 0.
137 * Return: number of values if @val was %NULL,
138 * %0 if the property was found (success),
139 * %-EINVAL if given arguments are not valid,
140 * %-ENODATA if the property does not have a value,
141 * %-EPROTO if the property is not an array of numbers,
142 * %-EOVERFLOW if the size of the property is not as expected.
143 * %-ENXIO if no suitable firmware interface is present.
145 int device_property_read_u32_array(struct device *dev, const char *propname,
146 u32 *val, size_t nval)
148 return fwnode_property_read_u32_array(dev_fwnode(dev), propname, val, nval);
150 EXPORT_SYMBOL_GPL(device_property_read_u32_array);
153 * device_property_read_u64_array - return a u64 array property of a device
154 * @dev: Device to get the property of
155 * @propname: Name of the property
156 * @val: The values are stored here or %NULL to return the number of values
157 * @nval: Size of the @val array
159 * Function reads an array of u64 properties with @propname from the device
160 * firmware description and stores them to @val if found.
162 * It's recommended to call device_property_count_u64() instead of calling
163 * this function with @val equals %NULL and @nval equals 0.
165 * Return: number of values if @val was %NULL,
166 * %0 if the property was found (success),
167 * %-EINVAL if given arguments are not valid,
168 * %-ENODATA if the property does not have a value,
169 * %-EPROTO if the property is not an array of numbers,
170 * %-EOVERFLOW if the size of the property is not as expected.
171 * %-ENXIO if no suitable firmware interface is present.
173 int device_property_read_u64_array(struct device *dev, const char *propname,
174 u64 *val, size_t nval)
176 return fwnode_property_read_u64_array(dev_fwnode(dev), propname, val, nval);
178 EXPORT_SYMBOL_GPL(device_property_read_u64_array);
181 * device_property_read_string_array - return a string array property of device
182 * @dev: Device to get the property of
183 * @propname: Name of the property
184 * @val: The values are stored here or %NULL to return the number of values
185 * @nval: Size of the @val array
187 * Function reads an array of string properties with @propname from the device
188 * firmware description and stores them to @val if found.
190 * It's recommended to call device_property_string_array_count() instead of calling
191 * this function with @val equals %NULL and @nval equals 0.
193 * Return: number of values read on success if @val is non-NULL,
194 * number of values available on success if @val is NULL,
195 * %-EINVAL if given arguments are not valid,
196 * %-ENODATA if the property does not have a value,
197 * %-EPROTO or %-EILSEQ if the property is not an array of strings,
198 * %-EOVERFLOW if the size of the property is not as expected.
199 * %-ENXIO if no suitable firmware interface is present.
201 int device_property_read_string_array(struct device *dev, const char *propname,
202 const char **val, size_t nval)
204 return fwnode_property_read_string_array(dev_fwnode(dev), propname, val, nval);
206 EXPORT_SYMBOL_GPL(device_property_read_string_array);
209 * device_property_read_string - return a string property of a device
210 * @dev: Device to get the property of
211 * @propname: Name of the property
212 * @val: The value is stored here
214 * Function reads property @propname from the device firmware description and
215 * stores the value into @val if found. The value is checked to be a string.
217 * Return: %0 if the property was found (success),
218 * %-EINVAL if given arguments are not valid,
219 * %-ENODATA if the property does not have a value,
220 * %-EPROTO or %-EILSEQ if the property type is not a string.
221 * %-ENXIO if no suitable firmware interface is present.
223 int device_property_read_string(struct device *dev, const char *propname,
226 return fwnode_property_read_string(dev_fwnode(dev), propname, val);
228 EXPORT_SYMBOL_GPL(device_property_read_string);
231 * device_property_match_string - find a string in an array and return index
232 * @dev: Device to get the property of
233 * @propname: Name of the property holding the array
234 * @string: String to look for
236 * Find a given string in a string array and if it is found return the
239 * Return: index, starting from %0, if the property was found (success),
240 * %-EINVAL if given arguments are not valid,
241 * %-ENODATA if the property does not have a value,
242 * %-EPROTO if the property is not an array of strings,
243 * %-ENXIO if no suitable firmware interface is present.
245 int device_property_match_string(struct device *dev, const char *propname,
248 return fwnode_property_match_string(dev_fwnode(dev), propname, string);
250 EXPORT_SYMBOL_GPL(device_property_match_string);
252 static int fwnode_property_read_int_array(const struct fwnode_handle *fwnode,
253 const char *propname,
254 unsigned int elem_size, void *val,
259 if (IS_ERR_OR_NULL(fwnode))
262 ret = fwnode_call_int_op(fwnode, property_read_int_array, propname,
263 elem_size, val, nval);
267 return fwnode_call_int_op(fwnode->secondary, property_read_int_array, propname,
268 elem_size, val, nval);
272 * fwnode_property_read_u8_array - return a u8 array property of firmware node
273 * @fwnode: Firmware node to get the property of
274 * @propname: Name of the property
275 * @val: The values are stored here or %NULL to return the number of values
276 * @nval: Size of the @val array
278 * Read an array of u8 properties with @propname from @fwnode and stores them to
281 * It's recommended to call fwnode_property_count_u8() instead of calling
282 * this function with @val equals %NULL and @nval equals 0.
284 * Return: number of values if @val was %NULL,
285 * %0 if the property was found (success),
286 * %-EINVAL if given arguments are not valid,
287 * %-ENODATA if the property does not have a value,
288 * %-EPROTO if the property is not an array of numbers,
289 * %-EOVERFLOW if the size of the property is not as expected,
290 * %-ENXIO if no suitable firmware interface is present.
292 int fwnode_property_read_u8_array(const struct fwnode_handle *fwnode,
293 const char *propname, u8 *val, size_t nval)
295 return fwnode_property_read_int_array(fwnode, propname, sizeof(u8),
298 EXPORT_SYMBOL_GPL(fwnode_property_read_u8_array);
301 * fwnode_property_read_u16_array - return a u16 array property of firmware node
302 * @fwnode: Firmware node to get the property of
303 * @propname: Name of the property
304 * @val: The values are stored here or %NULL to return the number of values
305 * @nval: Size of the @val array
307 * Read an array of u16 properties with @propname from @fwnode and store them to
310 * It's recommended to call fwnode_property_count_u16() instead of calling
311 * this function with @val equals %NULL and @nval equals 0.
313 * Return: number of values if @val was %NULL,
314 * %0 if the property was found (success),
315 * %-EINVAL if given arguments are not valid,
316 * %-ENODATA if the property does not have a value,
317 * %-EPROTO if the property is not an array of numbers,
318 * %-EOVERFLOW if the size of the property is not as expected,
319 * %-ENXIO if no suitable firmware interface is present.
321 int fwnode_property_read_u16_array(const struct fwnode_handle *fwnode,
322 const char *propname, u16 *val, size_t nval)
324 return fwnode_property_read_int_array(fwnode, propname, sizeof(u16),
327 EXPORT_SYMBOL_GPL(fwnode_property_read_u16_array);
330 * fwnode_property_read_u32_array - return a u32 array property of firmware node
331 * @fwnode: Firmware node to get the property of
332 * @propname: Name of the property
333 * @val: The values are stored here or %NULL to return the number of values
334 * @nval: Size of the @val array
336 * Read an array of u32 properties with @propname from @fwnode store them to
339 * It's recommended to call fwnode_property_count_u32() instead of calling
340 * this function with @val equals %NULL and @nval equals 0.
342 * Return: number of values if @val was %NULL,
343 * %0 if the property was found (success),
344 * %-EINVAL if given arguments are not valid,
345 * %-ENODATA if the property does not have a value,
346 * %-EPROTO if the property is not an array of numbers,
347 * %-EOVERFLOW if the size of the property is not as expected,
348 * %-ENXIO if no suitable firmware interface is present.
350 int fwnode_property_read_u32_array(const struct fwnode_handle *fwnode,
351 const char *propname, u32 *val, size_t nval)
353 return fwnode_property_read_int_array(fwnode, propname, sizeof(u32),
356 EXPORT_SYMBOL_GPL(fwnode_property_read_u32_array);
359 * fwnode_property_read_u64_array - return a u64 array property firmware node
360 * @fwnode: Firmware node to get the property of
361 * @propname: Name of the property
362 * @val: The values are stored here or %NULL to return the number of values
363 * @nval: Size of the @val array
365 * Read an array of u64 properties with @propname from @fwnode and store them to
368 * It's recommended to call fwnode_property_count_u64() instead of calling
369 * this function with @val equals %NULL and @nval equals 0.
371 * Return: number of values if @val was %NULL,
372 * %0 if the property was found (success),
373 * %-EINVAL if given arguments are not valid,
374 * %-ENODATA if the property does not have a value,
375 * %-EPROTO if the property is not an array of numbers,
376 * %-EOVERFLOW if the size of the property is not as expected,
377 * %-ENXIO if no suitable firmware interface is present.
379 int fwnode_property_read_u64_array(const struct fwnode_handle *fwnode,
380 const char *propname, u64 *val, size_t nval)
382 return fwnode_property_read_int_array(fwnode, propname, sizeof(u64),
385 EXPORT_SYMBOL_GPL(fwnode_property_read_u64_array);
388 * fwnode_property_read_string_array - return string array property of a node
389 * @fwnode: Firmware node to get the property of
390 * @propname: Name of the property
391 * @val: The values are stored here or %NULL to return the number of values
392 * @nval: Size of the @val array
394 * Read an string list property @propname from the given firmware node and store
395 * them to @val if found.
397 * It's recommended to call fwnode_property_string_array_count() instead of calling
398 * this function with @val equals %NULL and @nval equals 0.
400 * Return: number of values read on success if @val is non-NULL,
401 * number of values available on success if @val is NULL,
402 * %-EINVAL if given arguments are not valid,
403 * %-ENODATA if the property does not have a value,
404 * %-EPROTO or %-EILSEQ if the property is not an array of strings,
405 * %-EOVERFLOW if the size of the property is not as expected,
406 * %-ENXIO if no suitable firmware interface is present.
408 int fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
409 const char *propname, const char **val,
414 if (IS_ERR_OR_NULL(fwnode))
417 ret = fwnode_call_int_op(fwnode, property_read_string_array, propname,
422 return fwnode_call_int_op(fwnode->secondary, property_read_string_array, propname,
425 EXPORT_SYMBOL_GPL(fwnode_property_read_string_array);
428 * fwnode_property_read_string - return a string property of a firmware node
429 * @fwnode: Firmware node to get the property of
430 * @propname: Name of the property
431 * @val: The value is stored here
433 * Read property @propname from the given firmware node and store the value into
434 * @val if found. The value is checked to be a string.
436 * Return: %0 if the property was found (success),
437 * %-EINVAL if given arguments are not valid,
438 * %-ENODATA if the property does not have a value,
439 * %-EPROTO or %-EILSEQ if the property is not a string,
440 * %-ENXIO if no suitable firmware interface is present.
442 int fwnode_property_read_string(const struct fwnode_handle *fwnode,
443 const char *propname, const char **val)
445 int ret = fwnode_property_read_string_array(fwnode, propname, val, 1);
447 return ret < 0 ? ret : 0;
449 EXPORT_SYMBOL_GPL(fwnode_property_read_string);
452 * fwnode_property_match_string - find a string in an array and return index
453 * @fwnode: Firmware node to get the property of
454 * @propname: Name of the property holding the array
455 * @string: String to look for
457 * Find a given string in a string array and if it is found return the
460 * Return: index, starting from %0, if the property was found (success),
461 * %-EINVAL if given arguments are not valid,
462 * %-ENODATA if the property does not have a value,
463 * %-EPROTO if the property is not an array of strings,
464 * %-ENXIO if no suitable firmware interface is present.
466 int fwnode_property_match_string(const struct fwnode_handle *fwnode,
467 const char *propname, const char *string)
472 nval = fwnode_property_read_string_array(fwnode, propname, NULL, 0);
479 values = kcalloc(nval, sizeof(*values), GFP_KERNEL);
483 ret = fwnode_property_read_string_array(fwnode, propname, values, nval);
487 ret = match_string(values, nval, string);
495 EXPORT_SYMBOL_GPL(fwnode_property_match_string);
498 * fwnode_property_get_reference_args() - Find a reference with arguments
499 * @fwnode: Firmware node where to look for the reference
500 * @prop: The name of the property
501 * @nargs_prop: The name of the property telling the number of
502 * arguments in the referred node. NULL if @nargs is known,
503 * otherwise @nargs is ignored. Only relevant on OF.
504 * @nargs: Number of arguments. Ignored if @nargs_prop is non-NULL.
505 * @index: Index of the reference, from zero onwards.
506 * @args: Result structure with reference and integer arguments.
508 * Obtain a reference based on a named property in an fwnode, with
511 * Caller is responsible to call fwnode_handle_put() on the returned
512 * args->fwnode pointer.
514 * Returns: %0 on success
515 * %-ENOENT when the index is out of bounds, the index has an empty
516 * reference or the property was not found
517 * %-EINVAL on parse error
519 int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
520 const char *prop, const char *nargs_prop,
521 unsigned int nargs, unsigned int index,
522 struct fwnode_reference_args *args)
526 if (IS_ERR_OR_NULL(fwnode))
529 ret = fwnode_call_int_op(fwnode, get_reference_args, prop, nargs_prop,
534 if (IS_ERR_OR_NULL(fwnode->secondary))
537 return fwnode_call_int_op(fwnode->secondary, get_reference_args, prop, nargs_prop,
540 EXPORT_SYMBOL_GPL(fwnode_property_get_reference_args);
543 * fwnode_find_reference - Find named reference to a fwnode_handle
544 * @fwnode: Firmware node where to look for the reference
545 * @name: The name of the reference
546 * @index: Index of the reference
548 * @index can be used when the named reference holds a table of references.
550 * Returns pointer to the reference fwnode, or ERR_PTR. Caller is responsible to
551 * call fwnode_handle_put() on the returned fwnode pointer.
553 struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
557 struct fwnode_reference_args args;
560 ret = fwnode_property_get_reference_args(fwnode, name, NULL, 0, index,
562 return ret ? ERR_PTR(ret) : args.fwnode;
564 EXPORT_SYMBOL_GPL(fwnode_find_reference);
567 * fwnode_get_name - Return the name of a node
568 * @fwnode: The firmware node
570 * Returns a pointer to the node name.
572 const char *fwnode_get_name(const struct fwnode_handle *fwnode)
574 return fwnode_call_ptr_op(fwnode, get_name);
576 EXPORT_SYMBOL_GPL(fwnode_get_name);
579 * fwnode_get_name_prefix - Return the prefix of node for printing purposes
580 * @fwnode: The firmware node
582 * Returns the prefix of a node, intended to be printed right before the node.
583 * The prefix works also as a separator between the nodes.
585 const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
587 return fwnode_call_ptr_op(fwnode, get_name_prefix);
591 * fwnode_get_parent - Return parent firwmare node
592 * @fwnode: Firmware whose parent is retrieved
594 * Return parent firmware node of the given node if possible or %NULL if no
595 * parent was available.
597 struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode)
599 return fwnode_call_ptr_op(fwnode, get_parent);
601 EXPORT_SYMBOL_GPL(fwnode_get_parent);
604 * fwnode_get_next_parent - Iterate to the node's parent
605 * @fwnode: Firmware whose parent is retrieved
607 * This is like fwnode_get_parent() except that it drops the refcount
608 * on the passed node, making it suitable for iterating through a
611 * Returns a node pointer with refcount incremented, use
612 * fwnode_handle_put() on it when done.
614 struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode)
616 struct fwnode_handle *parent = fwnode_get_parent(fwnode);
618 fwnode_handle_put(fwnode);
622 EXPORT_SYMBOL_GPL(fwnode_get_next_parent);
625 * fwnode_get_next_parent_dev - Find device of closest ancestor fwnode
626 * @fwnode: firmware node
628 * Given a firmware node (@fwnode), this function finds its closest ancestor
629 * firmware node that has a corresponding struct device and returns that struct
632 * The caller of this function is expected to call put_device() on the returned
633 * device when they are done.
635 struct device *fwnode_get_next_parent_dev(struct fwnode_handle *fwnode)
637 struct fwnode_handle *parent;
640 fwnode_for_each_parent_node(fwnode, parent) {
641 dev = get_dev_from_fwnode(parent);
643 fwnode_handle_put(parent);
651 * fwnode_count_parents - Return the number of parents a node has
652 * @fwnode: The node the parents of which are to be counted
654 * Returns the number of parents a node has.
656 unsigned int fwnode_count_parents(const struct fwnode_handle *fwnode)
658 struct fwnode_handle *parent;
659 unsigned int count = 0;
661 fwnode_for_each_parent_node(fwnode, parent)
666 EXPORT_SYMBOL_GPL(fwnode_count_parents);
669 * fwnode_get_nth_parent - Return an nth parent of a node
670 * @fwnode: The node the parent of which is requested
671 * @depth: Distance of the parent from the node
673 * Returns the nth parent of a node. If there is no parent at the requested
674 * @depth, %NULL is returned. If @depth is 0, the functionality is equivalent to
675 * fwnode_handle_get(). For @depth == 1, it is fwnode_get_parent() and so on.
677 * The caller is responsible for calling fwnode_handle_put() for the returned
680 struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwnode,
683 struct fwnode_handle *parent;
686 return fwnode_handle_get(fwnode);
688 fwnode_for_each_parent_node(fwnode, parent) {
694 EXPORT_SYMBOL_GPL(fwnode_get_nth_parent);
697 * fwnode_is_ancestor_of - Test if @ancestor is ancestor of @child
698 * @ancestor: Firmware which is tested for being an ancestor
699 * @child: Firmware which is tested for being the child
701 * A node is considered an ancestor of itself too.
703 * Returns true if @ancestor is an ancestor of @child. Otherwise, returns false.
705 bool fwnode_is_ancestor_of(struct fwnode_handle *ancestor, struct fwnode_handle *child)
707 struct fwnode_handle *parent;
709 if (IS_ERR_OR_NULL(ancestor))
712 if (child == ancestor)
715 fwnode_for_each_parent_node(child, parent) {
716 if (parent == ancestor) {
717 fwnode_handle_put(parent);
725 * fwnode_get_next_child_node - Return the next child node handle for a node
726 * @fwnode: Firmware node to find the next child node for.
727 * @child: Handle to one of the node's child nodes or a %NULL handle.
729 struct fwnode_handle *
730 fwnode_get_next_child_node(const struct fwnode_handle *fwnode,
731 struct fwnode_handle *child)
733 return fwnode_call_ptr_op(fwnode, get_next_child_node, child);
735 EXPORT_SYMBOL_GPL(fwnode_get_next_child_node);
738 * fwnode_get_next_available_child_node - Return the next
739 * available child node handle for a node
740 * @fwnode: Firmware node to find the next child node for.
741 * @child: Handle to one of the node's child nodes or a %NULL handle.
743 struct fwnode_handle *
744 fwnode_get_next_available_child_node(const struct fwnode_handle *fwnode,
745 struct fwnode_handle *child)
747 struct fwnode_handle *next_child = child;
749 if (IS_ERR_OR_NULL(fwnode))
753 next_child = fwnode_get_next_child_node(fwnode, next_child);
756 } while (!fwnode_device_is_available(next_child));
760 EXPORT_SYMBOL_GPL(fwnode_get_next_available_child_node);
763 * device_get_next_child_node - Return the next child node handle for a device
764 * @dev: Device to find the next child node for.
765 * @child: Handle to one of the device's child nodes or a null handle.
767 struct fwnode_handle *device_get_next_child_node(const struct device *dev,
768 struct fwnode_handle *child)
770 const struct fwnode_handle *fwnode = dev_fwnode(dev);
771 struct fwnode_handle *next;
773 if (IS_ERR_OR_NULL(fwnode))
776 /* Try to find a child in primary fwnode */
777 next = fwnode_get_next_child_node(fwnode, child);
781 /* When no more children in primary, continue with secondary */
782 return fwnode_get_next_child_node(fwnode->secondary, child);
784 EXPORT_SYMBOL_GPL(device_get_next_child_node);
787 * fwnode_get_named_child_node - Return first matching named child node handle
788 * @fwnode: Firmware node to find the named child node for.
789 * @childname: String to match child node name against.
791 struct fwnode_handle *
792 fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
793 const char *childname)
795 return fwnode_call_ptr_op(fwnode, get_named_child_node, childname);
797 EXPORT_SYMBOL_GPL(fwnode_get_named_child_node);
800 * device_get_named_child_node - Return first matching named child node handle
801 * @dev: Device to find the named child node for.
802 * @childname: String to match child node name against.
804 struct fwnode_handle *device_get_named_child_node(const struct device *dev,
805 const char *childname)
807 return fwnode_get_named_child_node(dev_fwnode(dev), childname);
809 EXPORT_SYMBOL_GPL(device_get_named_child_node);
812 * fwnode_handle_get - Obtain a reference to a device node
813 * @fwnode: Pointer to the device node to obtain the reference to.
815 * Returns the fwnode handle.
817 struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode)
819 if (!fwnode_has_op(fwnode, get))
822 return fwnode_call_ptr_op(fwnode, get);
824 EXPORT_SYMBOL_GPL(fwnode_handle_get);
827 * fwnode_handle_put - Drop reference to a device node
828 * @fwnode: Pointer to the device node to drop the reference to.
830 * This has to be used when terminating device_for_each_child_node() iteration
831 * with break or return to prevent stale device node references from being left
834 void fwnode_handle_put(struct fwnode_handle *fwnode)
836 fwnode_call_void_op(fwnode, put);
838 EXPORT_SYMBOL_GPL(fwnode_handle_put);
841 * fwnode_device_is_available - check if a device is available for use
842 * @fwnode: Pointer to the fwnode of the device.
844 * For fwnode node types that don't implement the .device_is_available()
845 * operation, this function returns true.
847 bool fwnode_device_is_available(const struct fwnode_handle *fwnode)
849 if (IS_ERR_OR_NULL(fwnode))
852 if (!fwnode_has_op(fwnode, device_is_available))
855 return fwnode_call_bool_op(fwnode, device_is_available);
857 EXPORT_SYMBOL_GPL(fwnode_device_is_available);
860 * device_get_child_node_count - return the number of child nodes for device
861 * @dev: Device to cound the child nodes for
863 unsigned int device_get_child_node_count(const struct device *dev)
865 struct fwnode_handle *child;
866 unsigned int count = 0;
868 device_for_each_child_node(dev, child)
873 EXPORT_SYMBOL_GPL(device_get_child_node_count);
875 bool device_dma_supported(const struct device *dev)
877 return fwnode_call_bool_op(dev_fwnode(dev), device_dma_supported);
879 EXPORT_SYMBOL_GPL(device_dma_supported);
881 enum dev_dma_attr device_get_dma_attr(const struct device *dev)
883 if (!fwnode_has_op(dev_fwnode(dev), device_get_dma_attr))
884 return DEV_DMA_NOT_SUPPORTED;
886 return fwnode_call_int_op(dev_fwnode(dev), device_get_dma_attr);
888 EXPORT_SYMBOL_GPL(device_get_dma_attr);
891 * fwnode_get_phy_mode - Get phy mode for given firmware node
892 * @fwnode: Pointer to the given node
894 * The function gets phy interface string from property 'phy-mode' or
895 * 'phy-connection-type', and return its index in phy_modes table, or errno in
898 int fwnode_get_phy_mode(struct fwnode_handle *fwnode)
903 err = fwnode_property_read_string(fwnode, "phy-mode", &pm);
905 err = fwnode_property_read_string(fwnode,
906 "phy-connection-type", &pm);
910 for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
911 if (!strcasecmp(pm, phy_modes(i)))
916 EXPORT_SYMBOL_GPL(fwnode_get_phy_mode);
919 * device_get_phy_mode - Get phy mode for given device
920 * @dev: Pointer to the given device
922 * The function gets phy interface string from property 'phy-mode' or
923 * 'phy-connection-type', and return its index in phy_modes table, or errno in
926 int device_get_phy_mode(struct device *dev)
928 return fwnode_get_phy_mode(dev_fwnode(dev));
930 EXPORT_SYMBOL_GPL(device_get_phy_mode);
933 * fwnode_iomap - Maps the memory mapped IO for a given fwnode
934 * @fwnode: Pointer to the firmware node
935 * @index: Index of the IO range
937 * Returns a pointer to the mapped memory.
939 void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index)
941 return fwnode_call_ptr_op(fwnode, iomap, index);
943 EXPORT_SYMBOL(fwnode_iomap);
946 * fwnode_irq_get - Get IRQ directly from a fwnode
947 * @fwnode: Pointer to the firmware node
948 * @index: Zero-based index of the IRQ
950 * Returns Linux IRQ number on success. Other values are determined
951 * accordingly to acpi_/of_ irq_get() operation.
953 int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index)
955 return fwnode_call_int_op(fwnode, irq_get, index);
957 EXPORT_SYMBOL(fwnode_irq_get);
960 * fwnode_irq_get_byname - Get IRQ from a fwnode using its name
961 * @fwnode: Pointer to the firmware node
965 * Find a match to the string @name in the 'interrupt-names' string array
966 * in _DSD for ACPI, or of_node for Device Tree. Then get the Linux IRQ
967 * number of the IRQ resource corresponding to the index of the matched
971 * Linux IRQ number on success, or negative errno otherwise.
973 int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name)
980 index = fwnode_property_match_string(fwnode, "interrupt-names", name);
984 return fwnode_irq_get(fwnode, index);
986 EXPORT_SYMBOL(fwnode_irq_get_byname);
989 * fwnode_graph_get_next_endpoint - Get next endpoint firmware node
990 * @fwnode: Pointer to the parent firmware node
991 * @prev: Previous endpoint node or %NULL to get the first
993 * Returns an endpoint firmware node pointer or %NULL if no more endpoints
996 struct fwnode_handle *
997 fwnode_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
998 struct fwnode_handle *prev)
1000 const struct fwnode_handle *parent;
1001 struct fwnode_handle *ep;
1004 * If this function is in a loop and the previous iteration returned
1005 * an endpoint from fwnode->secondary, then we need to use the secondary
1006 * as parent rather than @fwnode.
1009 parent = fwnode_graph_get_port_parent(prev);
1012 if (IS_ERR_OR_NULL(parent))
1015 ep = fwnode_call_ptr_op(parent, graph_get_next_endpoint, prev);
1019 return fwnode_graph_get_next_endpoint(parent->secondary, NULL);
1021 EXPORT_SYMBOL_GPL(fwnode_graph_get_next_endpoint);
1024 * fwnode_graph_get_port_parent - Return the device fwnode of a port endpoint
1025 * @endpoint: Endpoint firmware node of the port
1027 * Return: the firmware node of the device the @endpoint belongs to.
1029 struct fwnode_handle *
1030 fwnode_graph_get_port_parent(const struct fwnode_handle *endpoint)
1032 struct fwnode_handle *port, *parent;
1034 port = fwnode_get_parent(endpoint);
1035 parent = fwnode_call_ptr_op(port, graph_get_port_parent);
1037 fwnode_handle_put(port);
1041 EXPORT_SYMBOL_GPL(fwnode_graph_get_port_parent);
1044 * fwnode_graph_get_remote_port_parent - Return fwnode of a remote device
1045 * @fwnode: Endpoint firmware node pointing to the remote endpoint
1047 * Extracts firmware node of a remote device the @fwnode points to.
1049 struct fwnode_handle *
1050 fwnode_graph_get_remote_port_parent(const struct fwnode_handle *fwnode)
1052 struct fwnode_handle *endpoint, *parent;
1054 endpoint = fwnode_graph_get_remote_endpoint(fwnode);
1055 parent = fwnode_graph_get_port_parent(endpoint);
1057 fwnode_handle_put(endpoint);
1061 EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_port_parent);
1064 * fwnode_graph_get_remote_port - Return fwnode of a remote port
1065 * @fwnode: Endpoint firmware node pointing to the remote endpoint
1067 * Extracts firmware node of a remote port the @fwnode points to.
1069 struct fwnode_handle *
1070 fwnode_graph_get_remote_port(const struct fwnode_handle *fwnode)
1072 return fwnode_get_next_parent(fwnode_graph_get_remote_endpoint(fwnode));
1074 EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_port);
1077 * fwnode_graph_get_remote_endpoint - Return fwnode of a remote endpoint
1078 * @fwnode: Endpoint firmware node pointing to the remote endpoint
1080 * Extracts firmware node of a remote endpoint the @fwnode points to.
1082 struct fwnode_handle *
1083 fwnode_graph_get_remote_endpoint(const struct fwnode_handle *fwnode)
1085 return fwnode_call_ptr_op(fwnode, graph_get_remote_endpoint);
1087 EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_endpoint);
1089 static bool fwnode_graph_remote_available(struct fwnode_handle *ep)
1091 struct fwnode_handle *dev_node;
1094 dev_node = fwnode_graph_get_remote_port_parent(ep);
1095 available = fwnode_device_is_available(dev_node);
1096 fwnode_handle_put(dev_node);
1102 * fwnode_graph_get_endpoint_by_id - get endpoint by port and endpoint numbers
1103 * @fwnode: parent fwnode_handle containing the graph
1104 * @port: identifier of the port node
1105 * @endpoint: identifier of the endpoint node under the port node
1106 * @flags: fwnode lookup flags
1108 * Return the fwnode handle of the local endpoint corresponding the port and
1109 * endpoint IDs or NULL if not found.
1111 * If FWNODE_GRAPH_ENDPOINT_NEXT is passed in @flags and the specified endpoint
1112 * has not been found, look for the closest endpoint ID greater than the
1113 * specified one and return the endpoint that corresponds to it, if present.
1115 * Does not return endpoints that belong to disabled devices or endpoints that
1116 * are unconnected, unless FWNODE_GRAPH_DEVICE_DISABLED is passed in @flags.
1118 * The returned endpoint needs to be released by calling fwnode_handle_put() on
1119 * it when it is not needed any more.
1121 struct fwnode_handle *
1122 fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode,
1123 u32 port, u32 endpoint, unsigned long flags)
1125 struct fwnode_handle *ep, *best_ep = NULL;
1126 unsigned int best_ep_id = 0;
1127 bool endpoint_next = flags & FWNODE_GRAPH_ENDPOINT_NEXT;
1128 bool enabled_only = !(flags & FWNODE_GRAPH_DEVICE_DISABLED);
1130 fwnode_graph_for_each_endpoint(fwnode, ep) {
1131 struct fwnode_endpoint fwnode_ep = { 0 };
1134 if (enabled_only && !fwnode_graph_remote_available(ep))
1137 ret = fwnode_graph_parse_endpoint(ep, &fwnode_ep);
1141 if (fwnode_ep.port != port)
1144 if (fwnode_ep.id == endpoint)
1151 * If the endpoint that has just been found is not the first
1152 * matching one and the ID of the one found previously is closer
1153 * to the requested endpoint ID, skip it.
1155 if (fwnode_ep.id < endpoint ||
1156 (best_ep && best_ep_id < fwnode_ep.id))
1159 fwnode_handle_put(best_ep);
1160 best_ep = fwnode_handle_get(ep);
1161 best_ep_id = fwnode_ep.id;
1166 EXPORT_SYMBOL_GPL(fwnode_graph_get_endpoint_by_id);
1169 * fwnode_graph_get_endpoint_count - Count endpoints on a device node
1170 * @fwnode: The node related to a device
1171 * @flags: fwnode lookup flags
1172 * Count endpoints in a device node.
1174 * If FWNODE_GRAPH_DEVICE_DISABLED flag is specified, also unconnected endpoints
1175 * and endpoints connected to disabled devices are counted.
1177 unsigned int fwnode_graph_get_endpoint_count(struct fwnode_handle *fwnode,
1178 unsigned long flags)
1180 struct fwnode_handle *ep;
1181 unsigned int count = 0;
1183 fwnode_graph_for_each_endpoint(fwnode, ep) {
1184 if (flags & FWNODE_GRAPH_DEVICE_DISABLED ||
1185 fwnode_graph_remote_available(ep))
1191 EXPORT_SYMBOL_GPL(fwnode_graph_get_endpoint_count);
1194 * fwnode_graph_parse_endpoint - parse common endpoint node properties
1195 * @fwnode: pointer to endpoint fwnode_handle
1196 * @endpoint: pointer to the fwnode endpoint data structure
1198 * Parse @fwnode representing a graph endpoint node and store the
1199 * information in @endpoint. The caller must hold a reference to
1202 int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
1203 struct fwnode_endpoint *endpoint)
1205 memset(endpoint, 0, sizeof(*endpoint));
1207 return fwnode_call_int_op(fwnode, graph_parse_endpoint, endpoint);
1209 EXPORT_SYMBOL(fwnode_graph_parse_endpoint);
1211 const void *device_get_match_data(const struct device *dev)
1213 return fwnode_call_ptr_op(dev_fwnode(dev), device_get_match_data, dev);
1215 EXPORT_SYMBOL_GPL(device_get_match_data);
1217 static unsigned int fwnode_graph_devcon_matches(const struct fwnode_handle *fwnode,
1218 const char *con_id, void *data,
1219 devcon_match_fn_t match,
1221 unsigned int matches_len)
1223 struct fwnode_handle *node;
1224 struct fwnode_handle *ep;
1225 unsigned int count = 0;
1228 fwnode_graph_for_each_endpoint(fwnode, ep) {
1229 if (matches && count >= matches_len) {
1230 fwnode_handle_put(ep);
1234 node = fwnode_graph_get_remote_port_parent(ep);
1235 if (!fwnode_device_is_available(node)) {
1236 fwnode_handle_put(node);
1240 ret = match(node, con_id, data);
1241 fwnode_handle_put(node);
1244 matches[count] = ret;
1251 static unsigned int fwnode_devcon_matches(const struct fwnode_handle *fwnode,
1252 const char *con_id, void *data,
1253 devcon_match_fn_t match,
1255 unsigned int matches_len)
1257 struct fwnode_handle *node;
1258 unsigned int count = 0;
1262 for (i = 0; ; i++) {
1263 if (matches && count >= matches_len)
1266 node = fwnode_find_reference(fwnode, con_id, i);
1270 ret = match(node, NULL, data);
1271 fwnode_handle_put(node);
1274 matches[count] = ret;
1283 * fwnode_connection_find_match - Find connection from a device node
1284 * @fwnode: Device node with the connection
1285 * @con_id: Identifier for the connection
1286 * @data: Data for the match function
1287 * @match: Function to check and convert the connection description
1289 * Find a connection with unique identifier @con_id between @fwnode and another
1290 * device node. @match will be used to convert the connection description to
1291 * data the caller is expecting to be returned.
1293 void *fwnode_connection_find_match(const struct fwnode_handle *fwnode,
1294 const char *con_id, void *data,
1295 devcon_match_fn_t match)
1300 if (!fwnode || !match)
1303 count = fwnode_graph_devcon_matches(fwnode, con_id, data, match, &ret, 1);
1307 count = fwnode_devcon_matches(fwnode, con_id, data, match, &ret, 1);
1308 return count ? ret : NULL;
1310 EXPORT_SYMBOL_GPL(fwnode_connection_find_match);
1313 * fwnode_connection_find_matches - Find connections from a device node
1314 * @fwnode: Device node with the connection
1315 * @con_id: Identifier for the connection
1316 * @data: Data for the match function
1317 * @match: Function to check and convert the connection description
1318 * @matches: (Optional) array of pointers to fill with matches
1319 * @matches_len: Length of @matches
1321 * Find up to @matches_len connections with unique identifier @con_id between
1322 * @fwnode and other device nodes. @match will be used to convert the
1323 * connection description to data the caller is expecting to be returned
1324 * through the @matches array.
1325 * If @matches is NULL @matches_len is ignored and the total number of resolved
1326 * matches is returned.
1328 * Return: Number of matches resolved, or negative errno.
1330 int fwnode_connection_find_matches(const struct fwnode_handle *fwnode,
1331 const char *con_id, void *data,
1332 devcon_match_fn_t match,
1333 void **matches, unsigned int matches_len)
1335 unsigned int count_graph;
1336 unsigned int count_ref;
1338 if (!fwnode || !match)
1341 count_graph = fwnode_graph_devcon_matches(fwnode, con_id, data, match,
1342 matches, matches_len);
1345 matches += count_graph;
1346 matches_len -= count_graph;
1349 count_ref = fwnode_devcon_matches(fwnode, con_id, data, match,
1350 matches, matches_len);
1352 return count_graph + count_ref;
1354 EXPORT_SYMBOL_GPL(fwnode_connection_find_matches);