1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * property.h - 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 #ifndef _LINUX_PROPERTY_H_
11 #define _LINUX_PROPERTY_H_
13 #include <linux/bits.h>
14 #include <linux/fwnode.h>
15 #include <linux/types.h>
30 DEV_DMA_NOT_SUPPORTED,
35 struct fwnode_handle *dev_fwnode(struct device *dev);
37 bool device_property_present(struct device *dev, const char *propname);
38 int device_property_read_u8_array(struct device *dev, const char *propname,
39 u8 *val, size_t nval);
40 int device_property_read_u16_array(struct device *dev, const char *propname,
41 u16 *val, size_t nval);
42 int device_property_read_u32_array(struct device *dev, const char *propname,
43 u32 *val, size_t nval);
44 int device_property_read_u64_array(struct device *dev, const char *propname,
45 u64 *val, size_t nval);
46 int device_property_read_string_array(struct device *dev, const char *propname,
47 const char **val, size_t nval);
48 int device_property_read_string(struct device *dev, const char *propname,
50 int device_property_match_string(struct device *dev,
51 const char *propname, const char *string);
53 bool fwnode_device_is_available(const struct fwnode_handle *fwnode);
54 bool fwnode_property_present(const struct fwnode_handle *fwnode,
55 const char *propname);
56 int fwnode_property_read_u8_array(const struct fwnode_handle *fwnode,
57 const char *propname, u8 *val,
59 int fwnode_property_read_u16_array(const struct fwnode_handle *fwnode,
60 const char *propname, u16 *val,
62 int fwnode_property_read_u32_array(const struct fwnode_handle *fwnode,
63 const char *propname, u32 *val,
65 int fwnode_property_read_u64_array(const struct fwnode_handle *fwnode,
66 const char *propname, u64 *val,
68 int fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
69 const char *propname, const char **val,
71 int fwnode_property_read_string(const struct fwnode_handle *fwnode,
72 const char *propname, const char **val);
73 int fwnode_property_match_string(const struct fwnode_handle *fwnode,
74 const char *propname, const char *string);
75 int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
76 const char *prop, const char *nargs_prop,
77 unsigned int nargs, unsigned int index,
78 struct fwnode_reference_args *args);
80 struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
84 const char *fwnode_get_name(const struct fwnode_handle *fwnode);
85 const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode);
86 struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
87 struct fwnode_handle *fwnode_get_next_parent(
88 struct fwnode_handle *fwnode);
89 struct device *fwnode_get_next_parent_dev(struct fwnode_handle *fwnode);
90 unsigned int fwnode_count_parents(const struct fwnode_handle *fwn);
91 struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwn,
93 bool fwnode_is_ancestor_of(struct fwnode_handle *test_ancestor,
94 struct fwnode_handle *test_child);
95 struct fwnode_handle *fwnode_get_next_child_node(
96 const struct fwnode_handle *fwnode, struct fwnode_handle *child);
97 struct fwnode_handle *fwnode_get_next_available_child_node(
98 const struct fwnode_handle *fwnode, struct fwnode_handle *child);
100 #define fwnode_for_each_child_node(fwnode, child) \
101 for (child = fwnode_get_next_child_node(fwnode, NULL); child; \
102 child = fwnode_get_next_child_node(fwnode, child))
104 #define fwnode_for_each_available_child_node(fwnode, child) \
105 for (child = fwnode_get_next_available_child_node(fwnode, NULL); child;\
106 child = fwnode_get_next_available_child_node(fwnode, child))
108 struct fwnode_handle *device_get_next_child_node(
109 struct device *dev, struct fwnode_handle *child);
111 #define device_for_each_child_node(dev, child) \
112 for (child = device_get_next_child_node(dev, NULL); child; \
113 child = device_get_next_child_node(dev, child))
115 struct fwnode_handle *fwnode_get_named_child_node(
116 const struct fwnode_handle *fwnode, const char *childname);
117 struct fwnode_handle *device_get_named_child_node(struct device *dev,
118 const char *childname);
120 struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);
121 void fwnode_handle_put(struct fwnode_handle *fwnode);
123 int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index);
125 unsigned int device_get_child_node_count(struct device *dev);
127 static inline bool device_property_read_bool(struct device *dev,
128 const char *propname)
130 return device_property_present(dev, propname);
133 static inline int device_property_read_u8(struct device *dev,
134 const char *propname, u8 *val)
136 return device_property_read_u8_array(dev, propname, val, 1);
139 static inline int device_property_read_u16(struct device *dev,
140 const char *propname, u16 *val)
142 return device_property_read_u16_array(dev, propname, val, 1);
145 static inline int device_property_read_u32(struct device *dev,
146 const char *propname, u32 *val)
148 return device_property_read_u32_array(dev, propname, val, 1);
151 static inline int device_property_read_u64(struct device *dev,
152 const char *propname, u64 *val)
154 return device_property_read_u64_array(dev, propname, val, 1);
157 static inline int device_property_count_u8(struct device *dev, const char *propname)
159 return device_property_read_u8_array(dev, propname, NULL, 0);
162 static inline int device_property_count_u16(struct device *dev, const char *propname)
164 return device_property_read_u16_array(dev, propname, NULL, 0);
167 static inline int device_property_count_u32(struct device *dev, const char *propname)
169 return device_property_read_u32_array(dev, propname, NULL, 0);
172 static inline int device_property_count_u64(struct device *dev, const char *propname)
174 return device_property_read_u64_array(dev, propname, NULL, 0);
177 static inline int device_property_string_array_count(struct device *dev,
178 const char *propname)
180 return device_property_read_string_array(dev, propname, NULL, 0);
183 static inline bool fwnode_property_read_bool(const struct fwnode_handle *fwnode,
184 const char *propname)
186 return fwnode_property_present(fwnode, propname);
189 static inline int fwnode_property_read_u8(const struct fwnode_handle *fwnode,
190 const char *propname, u8 *val)
192 return fwnode_property_read_u8_array(fwnode, propname, val, 1);
195 static inline int fwnode_property_read_u16(const struct fwnode_handle *fwnode,
196 const char *propname, u16 *val)
198 return fwnode_property_read_u16_array(fwnode, propname, val, 1);
201 static inline int fwnode_property_read_u32(const struct fwnode_handle *fwnode,
202 const char *propname, u32 *val)
204 return fwnode_property_read_u32_array(fwnode, propname, val, 1);
207 static inline int fwnode_property_read_u64(const struct fwnode_handle *fwnode,
208 const char *propname, u64 *val)
210 return fwnode_property_read_u64_array(fwnode, propname, val, 1);
213 static inline int fwnode_property_count_u8(const struct fwnode_handle *fwnode,
214 const char *propname)
216 return fwnode_property_read_u8_array(fwnode, propname, NULL, 0);
219 static inline int fwnode_property_count_u16(const struct fwnode_handle *fwnode,
220 const char *propname)
222 return fwnode_property_read_u16_array(fwnode, propname, NULL, 0);
225 static inline int fwnode_property_count_u32(const struct fwnode_handle *fwnode,
226 const char *propname)
228 return fwnode_property_read_u32_array(fwnode, propname, NULL, 0);
231 static inline int fwnode_property_count_u64(const struct fwnode_handle *fwnode,
232 const char *propname)
234 return fwnode_property_read_u64_array(fwnode, propname, NULL, 0);
238 fwnode_property_string_array_count(const struct fwnode_handle *fwnode,
239 const char *propname)
241 return fwnode_property_read_string_array(fwnode, propname, NULL, 0);
244 struct software_node;
247 * struct software_node_ref_args - Reference property with additional arguments
248 * @node: Reference to a software node
249 * @nargs: Number of elements in @args array
250 * @args: Integer arguments
252 struct software_node_ref_args {
253 const struct software_node *node;
255 u64 args[NR_FWNODE_REFERENCE_ARGS];
258 #define SOFTWARE_NODE_REFERENCE(_ref_, ...) \
259 (const struct software_node_ref_args) { \
261 .nargs = ARRAY_SIZE(((u64[]){ 0, ##__VA_ARGS__ })) - 1, \
262 .args = { __VA_ARGS__ }, \
266 * struct property_entry - "Built-in" device property representation.
267 * @name: Name of the property.
268 * @length: Length of data making up the value.
269 * @is_inline: True when the property value is stored inline.
270 * @type: Type of the data in unions.
271 * @pointer: Pointer to the property when it is not stored inline.
272 * @value: Value of the property when it is stored inline.
274 struct property_entry {
278 enum dev_prop_type type;
282 u8 u8_data[sizeof(u64) / sizeof(u8)];
283 u16 u16_data[sizeof(u64) / sizeof(u16)];
284 u32 u32_data[sizeof(u64) / sizeof(u32)];
285 u64 u64_data[sizeof(u64) / sizeof(u64)];
286 const char *str[sizeof(u64) / sizeof(char *)];
292 * Note: the below initializers for the anonymous union are carefully
293 * crafted to avoid gcc-4.4.4's problems with initialization of anon unions
297 #define __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_) \
298 sizeof(((struct property_entry *)NULL)->value._elem_[0])
300 #define __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, _elsize_, _Type_, \
302 (struct property_entry) { \
304 .length = (_len_) * (_elsize_), \
305 .type = DEV_PROP_##_Type_, \
306 { .pointer = _val_ }, \
309 #define __PROPERTY_ENTRY_ARRAY_LEN(_name_, _elem_, _Type_, _val_, _len_)\
310 __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \
311 __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \
312 _Type_, _val_, _len_)
314 #define PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, _len_) \
315 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u8_data, U8, _val_, _len_)
316 #define PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, _len_) \
317 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u16_data, U16, _val_, _len_)
318 #define PROPERTY_ENTRY_U32_ARRAY_LEN(_name_, _val_, _len_) \
319 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u32_data, U32, _val_, _len_)
320 #define PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, _len_) \
321 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u64_data, U64, _val_, _len_)
322 #define PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, _len_) \
323 __PROPERTY_ENTRY_ARRAY_LEN(_name_, str, STRING, _val_, _len_)
324 #define PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, _len_) \
325 __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \
326 sizeof(struct software_node_ref_args), \
329 #define PROPERTY_ENTRY_U8_ARRAY(_name_, _val_) \
330 PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
331 #define PROPERTY_ENTRY_U16_ARRAY(_name_, _val_) \
332 PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
333 #define PROPERTY_ENTRY_U32_ARRAY(_name_, _val_) \
334 PROPERTY_ENTRY_U32_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
335 #define PROPERTY_ENTRY_U64_ARRAY(_name_, _val_) \
336 PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
337 #define PROPERTY_ENTRY_STRING_ARRAY(_name_, _val_) \
338 PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
339 #define PROPERTY_ENTRY_REF_ARRAY(_name_, _val_) \
340 PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
342 #define __PROPERTY_ENTRY_ELEMENT(_name_, _elem_, _Type_, _val_) \
343 (struct property_entry) { \
345 .length = __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \
347 .type = DEV_PROP_##_Type_, \
348 { .value = { ._elem_[0] = _val_ } }, \
351 #define PROPERTY_ENTRY_U8(_name_, _val_) \
352 __PROPERTY_ENTRY_ELEMENT(_name_, u8_data, U8, _val_)
353 #define PROPERTY_ENTRY_U16(_name_, _val_) \
354 __PROPERTY_ENTRY_ELEMENT(_name_, u16_data, U16, _val_)
355 #define PROPERTY_ENTRY_U32(_name_, _val_) \
356 __PROPERTY_ENTRY_ELEMENT(_name_, u32_data, U32, _val_)
357 #define PROPERTY_ENTRY_U64(_name_, _val_) \
358 __PROPERTY_ENTRY_ELEMENT(_name_, u64_data, U64, _val_)
359 #define PROPERTY_ENTRY_STRING(_name_, _val_) \
360 __PROPERTY_ENTRY_ELEMENT(_name_, str, STRING, _val_)
362 #define PROPERTY_ENTRY_BOOL(_name_) \
363 (struct property_entry) { \
368 #define PROPERTY_ENTRY_REF(_name_, _ref_, ...) \
369 (struct property_entry) { \
371 .length = sizeof(struct software_node_ref_args), \
372 .type = DEV_PROP_REF, \
373 { .pointer = &SOFTWARE_NODE_REFERENCE(_ref_, ##__VA_ARGS__), }, \
376 struct property_entry *
377 property_entries_dup(const struct property_entry *properties);
379 void property_entries_free(const struct property_entry *properties);
381 int device_add_properties(struct device *dev,
382 const struct property_entry *properties);
383 void device_remove_properties(struct device *dev);
385 bool device_dma_supported(struct device *dev);
387 enum dev_dma_attr device_get_dma_attr(struct device *dev);
389 const void *device_get_match_data(struct device *dev);
391 int device_get_phy_mode(struct device *dev);
393 int fwnode_get_phy_mode(struct fwnode_handle *fwnode);
394 struct fwnode_handle *fwnode_graph_get_next_endpoint(
395 const struct fwnode_handle *fwnode, struct fwnode_handle *prev);
396 struct fwnode_handle *
397 fwnode_graph_get_port_parent(const struct fwnode_handle *fwnode);
398 struct fwnode_handle *fwnode_graph_get_remote_port_parent(
399 const struct fwnode_handle *fwnode);
400 struct fwnode_handle *fwnode_graph_get_remote_port(
401 const struct fwnode_handle *fwnode);
402 struct fwnode_handle *fwnode_graph_get_remote_endpoint(
403 const struct fwnode_handle *fwnode);
404 struct fwnode_handle *
405 fwnode_graph_get_remote_node(const struct fwnode_handle *fwnode, u32 port,
408 static inline bool fwnode_graph_is_endpoint(struct fwnode_handle *fwnode)
410 return fwnode_property_present(fwnode, "remote-endpoint");
414 * Fwnode lookup flags
416 * @FWNODE_GRAPH_ENDPOINT_NEXT: In the case of no exact match, look for the
417 * closest endpoint ID greater than the specified
419 * @FWNODE_GRAPH_DEVICE_DISABLED: That the device to which the remote
420 * endpoint of the given endpoint belongs to,
423 #define FWNODE_GRAPH_ENDPOINT_NEXT BIT(0)
424 #define FWNODE_GRAPH_DEVICE_DISABLED BIT(1)
426 struct fwnode_handle *
427 fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode,
428 u32 port, u32 endpoint, unsigned long flags);
430 #define fwnode_graph_for_each_endpoint(fwnode, child) \
432 (child = fwnode_graph_get_next_endpoint(fwnode, child)); )
434 int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
435 struct fwnode_endpoint *endpoint);
437 typedef void *(*devcon_match_fn_t)(struct fwnode_handle *fwnode, const char *id,
440 void *fwnode_connection_find_match(struct fwnode_handle *fwnode,
441 const char *con_id, void *data,
442 devcon_match_fn_t match);
444 static inline void *device_connection_find_match(struct device *dev,
445 const char *con_id, void *data,
446 devcon_match_fn_t match)
448 return fwnode_connection_find_match(dev_fwnode(dev), con_id, data, match);
451 /* -------------------------------------------------------------------------- */
452 /* Software fwnode support - when HW description is incomplete or missing */
455 * struct software_node - Software node description
456 * @name: Name of the software node
457 * @parent: Parent of the software node
458 * @properties: Array of device properties
460 struct software_node {
462 const struct software_node *parent;
463 const struct property_entry *properties;
466 bool is_software_node(const struct fwnode_handle *fwnode);
467 const struct software_node *
468 to_software_node(const struct fwnode_handle *fwnode);
469 struct fwnode_handle *software_node_fwnode(const struct software_node *node);
471 const struct software_node *
472 software_node_find_by_name(const struct software_node *parent,
475 int software_node_register_nodes(const struct software_node *nodes);
476 void software_node_unregister_nodes(const struct software_node *nodes);
478 int software_node_register_node_group(const struct software_node **node_group);
479 void software_node_unregister_node_group(const struct software_node **node_group);
481 int software_node_register(const struct software_node *node);
482 void software_node_unregister(const struct software_node *node);
484 struct fwnode_handle *
485 fwnode_create_software_node(const struct property_entry *properties,
486 const struct fwnode_handle *parent);
487 void fwnode_remove_software_node(struct fwnode_handle *fwnode);
489 int device_add_software_node(struct device *dev, const struct software_node *node);
490 void device_remove_software_node(struct device *dev);
492 int device_create_managed_software_node(struct device *dev,
493 const struct property_entry *properties,
494 const struct software_node *parent);
496 #endif /* _LINUX_PROPERTY_H_ */