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>
29 DEV_DMA_NOT_SUPPORTED,
34 struct fwnode_handle *dev_fwnode(struct device *dev);
36 bool device_property_present(struct device *dev, const char *propname);
37 int device_property_read_u8_array(struct device *dev, const char *propname,
38 u8 *val, size_t nval);
39 int device_property_read_u16_array(struct device *dev, const char *propname,
40 u16 *val, size_t nval);
41 int device_property_read_u32_array(struct device *dev, const char *propname,
42 u32 *val, size_t nval);
43 int device_property_read_u64_array(struct device *dev, const char *propname,
44 u64 *val, size_t nval);
45 int device_property_read_string_array(struct device *dev, const char *propname,
46 const char **val, size_t nval);
47 int device_property_read_string(struct device *dev, const char *propname,
49 int device_property_match_string(struct device *dev,
50 const char *propname, const char *string);
52 bool fwnode_device_is_available(const struct fwnode_handle *fwnode);
53 bool fwnode_property_present(const struct fwnode_handle *fwnode,
54 const char *propname);
55 int fwnode_property_read_u8_array(const struct fwnode_handle *fwnode,
56 const char *propname, u8 *val,
58 int fwnode_property_read_u16_array(const struct fwnode_handle *fwnode,
59 const char *propname, u16 *val,
61 int fwnode_property_read_u32_array(const struct fwnode_handle *fwnode,
62 const char *propname, u32 *val,
64 int fwnode_property_read_u64_array(const struct fwnode_handle *fwnode,
65 const char *propname, u64 *val,
67 int fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
68 const char *propname, const char **val,
70 int fwnode_property_read_string(const struct fwnode_handle *fwnode,
71 const char *propname, const char **val);
72 int fwnode_property_match_string(const struct fwnode_handle *fwnode,
73 const char *propname, const char *string);
74 int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
75 const char *prop, const char *nargs_prop,
76 unsigned int nargs, unsigned int index,
77 struct fwnode_reference_args *args);
79 struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
83 const char *fwnode_get_name(const struct fwnode_handle *fwnode);
84 const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode);
85 struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
86 struct fwnode_handle *fwnode_get_next_parent(
87 struct fwnode_handle *fwnode);
88 struct device *fwnode_get_next_parent_dev(struct fwnode_handle *fwnode);
89 unsigned int fwnode_count_parents(const struct fwnode_handle *fwn);
90 struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwn,
92 bool fwnode_is_ancestor_of(struct fwnode_handle *test_ancestor,
93 struct fwnode_handle *test_child);
94 struct fwnode_handle *fwnode_get_next_child_node(
95 const struct fwnode_handle *fwnode, struct fwnode_handle *child);
96 struct fwnode_handle *fwnode_get_next_available_child_node(
97 const struct fwnode_handle *fwnode, struct fwnode_handle *child);
99 #define fwnode_for_each_child_node(fwnode, child) \
100 for (child = fwnode_get_next_child_node(fwnode, NULL); child; \
101 child = fwnode_get_next_child_node(fwnode, child))
103 #define fwnode_for_each_available_child_node(fwnode, child) \
104 for (child = fwnode_get_next_available_child_node(fwnode, NULL); child;\
105 child = fwnode_get_next_available_child_node(fwnode, child))
107 struct fwnode_handle *device_get_next_child_node(
108 struct device *dev, struct fwnode_handle *child);
110 #define device_for_each_child_node(dev, child) \
111 for (child = device_get_next_child_node(dev, NULL); child; \
112 child = device_get_next_child_node(dev, child))
114 struct fwnode_handle *fwnode_get_named_child_node(
115 const struct fwnode_handle *fwnode, const char *childname);
116 struct fwnode_handle *device_get_named_child_node(struct device *dev,
117 const char *childname);
119 struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);
120 void fwnode_handle_put(struct fwnode_handle *fwnode);
122 int fwnode_irq_get(struct fwnode_handle *fwnode, unsigned int index);
124 unsigned int device_get_child_node_count(struct device *dev);
126 static inline bool device_property_read_bool(struct device *dev,
127 const char *propname)
129 return device_property_present(dev, propname);
132 static inline int device_property_read_u8(struct device *dev,
133 const char *propname, u8 *val)
135 return device_property_read_u8_array(dev, propname, val, 1);
138 static inline int device_property_read_u16(struct device *dev,
139 const char *propname, u16 *val)
141 return device_property_read_u16_array(dev, propname, val, 1);
144 static inline int device_property_read_u32(struct device *dev,
145 const char *propname, u32 *val)
147 return device_property_read_u32_array(dev, propname, val, 1);
150 static inline int device_property_read_u64(struct device *dev,
151 const char *propname, u64 *val)
153 return device_property_read_u64_array(dev, propname, val, 1);
156 static inline int device_property_count_u8(struct device *dev, const char *propname)
158 return device_property_read_u8_array(dev, propname, NULL, 0);
161 static inline int device_property_count_u16(struct device *dev, const char *propname)
163 return device_property_read_u16_array(dev, propname, NULL, 0);
166 static inline int device_property_count_u32(struct device *dev, const char *propname)
168 return device_property_read_u32_array(dev, propname, NULL, 0);
171 static inline int device_property_count_u64(struct device *dev, const char *propname)
173 return device_property_read_u64_array(dev, propname, NULL, 0);
176 static inline int device_property_string_array_count(struct device *dev,
177 const char *propname)
179 return device_property_read_string_array(dev, propname, NULL, 0);
182 static inline bool fwnode_property_read_bool(const struct fwnode_handle *fwnode,
183 const char *propname)
185 return fwnode_property_present(fwnode, propname);
188 static inline int fwnode_property_read_u8(const struct fwnode_handle *fwnode,
189 const char *propname, u8 *val)
191 return fwnode_property_read_u8_array(fwnode, propname, val, 1);
194 static inline int fwnode_property_read_u16(const struct fwnode_handle *fwnode,
195 const char *propname, u16 *val)
197 return fwnode_property_read_u16_array(fwnode, propname, val, 1);
200 static inline int fwnode_property_read_u32(const struct fwnode_handle *fwnode,
201 const char *propname, u32 *val)
203 return fwnode_property_read_u32_array(fwnode, propname, val, 1);
206 static inline int fwnode_property_read_u64(const struct fwnode_handle *fwnode,
207 const char *propname, u64 *val)
209 return fwnode_property_read_u64_array(fwnode, propname, val, 1);
212 static inline int fwnode_property_count_u8(const struct fwnode_handle *fwnode,
213 const char *propname)
215 return fwnode_property_read_u8_array(fwnode, propname, NULL, 0);
218 static inline int fwnode_property_count_u16(const struct fwnode_handle *fwnode,
219 const char *propname)
221 return fwnode_property_read_u16_array(fwnode, propname, NULL, 0);
224 static inline int fwnode_property_count_u32(const struct fwnode_handle *fwnode,
225 const char *propname)
227 return fwnode_property_read_u32_array(fwnode, propname, NULL, 0);
230 static inline int fwnode_property_count_u64(const struct fwnode_handle *fwnode,
231 const char *propname)
233 return fwnode_property_read_u64_array(fwnode, propname, NULL, 0);
237 fwnode_property_string_array_count(const struct fwnode_handle *fwnode,
238 const char *propname)
240 return fwnode_property_read_string_array(fwnode, propname, NULL, 0);
243 struct software_node;
246 * struct software_node_ref_args - Reference property with additional arguments
247 * @node: Reference to a software node
248 * @nargs: Number of elements in @args array
249 * @args: Integer arguments
251 struct software_node_ref_args {
252 const struct software_node *node;
254 u64 args[NR_FWNODE_REFERENCE_ARGS];
258 * struct property_entry - "Built-in" device property representation.
259 * @name: Name of the property.
260 * @length: Length of data making up the value.
261 * @is_inline: True when the property value is stored inline.
262 * @type: Type of the data in unions.
263 * @pointer: Pointer to the property when it is not stored inline.
264 * @value: Value of the property when it is stored inline.
266 struct property_entry {
270 enum dev_prop_type type;
274 u8 u8_data[sizeof(u64) / sizeof(u8)];
275 u16 u16_data[sizeof(u64) / sizeof(u16)];
276 u32 u32_data[sizeof(u64) / sizeof(u32)];
277 u64 u64_data[sizeof(u64) / sizeof(u64)];
278 const char *str[sizeof(u64) / sizeof(char *)];
284 * Note: the below initializers for the anonymous union are carefully
285 * crafted to avoid gcc-4.4.4's problems with initialization of anon unions
289 #define __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_) \
290 sizeof(((struct property_entry *)NULL)->value._elem_[0])
292 #define __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, _elsize_, _Type_, \
294 (struct property_entry) { \
296 .length = (_len_) * (_elsize_), \
297 .type = DEV_PROP_##_Type_, \
298 { .pointer = _val_ }, \
301 #define __PROPERTY_ENTRY_ARRAY_LEN(_name_, _elem_, _Type_, _val_, _len_)\
302 __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \
303 __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \
304 _Type_, _val_, _len_)
306 #define PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, _len_) \
307 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u8_data, U8, _val_, _len_)
308 #define PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, _len_) \
309 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u16_data, U16, _val_, _len_)
310 #define PROPERTY_ENTRY_U32_ARRAY_LEN(_name_, _val_, _len_) \
311 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u32_data, U32, _val_, _len_)
312 #define PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, _len_) \
313 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u64_data, U64, _val_, _len_)
314 #define PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, _len_) \
315 __PROPERTY_ENTRY_ARRAY_LEN(_name_, str, STRING, _val_, _len_)
316 #define PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, _len_) \
317 __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \
318 sizeof(struct software_node_ref_args), \
321 #define PROPERTY_ENTRY_U8_ARRAY(_name_, _val_) \
322 PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
323 #define PROPERTY_ENTRY_U16_ARRAY(_name_, _val_) \
324 PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
325 #define PROPERTY_ENTRY_U32_ARRAY(_name_, _val_) \
326 PROPERTY_ENTRY_U32_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
327 #define PROPERTY_ENTRY_U64_ARRAY(_name_, _val_) \
328 PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
329 #define PROPERTY_ENTRY_STRING_ARRAY(_name_, _val_) \
330 PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
331 #define PROPERTY_ENTRY_REF_ARRAY(_name_, _val_) \
332 PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
334 #define __PROPERTY_ENTRY_ELEMENT(_name_, _elem_, _Type_, _val_) \
335 (struct property_entry) { \
337 .length = __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \
339 .type = DEV_PROP_##_Type_, \
340 { .value = { ._elem_[0] = _val_ } }, \
343 #define PROPERTY_ENTRY_U8(_name_, _val_) \
344 __PROPERTY_ENTRY_ELEMENT(_name_, u8_data, U8, _val_)
345 #define PROPERTY_ENTRY_U16(_name_, _val_) \
346 __PROPERTY_ENTRY_ELEMENT(_name_, u16_data, U16, _val_)
347 #define PROPERTY_ENTRY_U32(_name_, _val_) \
348 __PROPERTY_ENTRY_ELEMENT(_name_, u32_data, U32, _val_)
349 #define PROPERTY_ENTRY_U64(_name_, _val_) \
350 __PROPERTY_ENTRY_ELEMENT(_name_, u64_data, U64, _val_)
351 #define PROPERTY_ENTRY_STRING(_name_, _val_) \
352 __PROPERTY_ENTRY_ELEMENT(_name_, str, STRING, _val_)
354 #define PROPERTY_ENTRY_BOOL(_name_) \
355 (struct property_entry) { \
360 #define PROPERTY_ENTRY_REF(_name_, _ref_, ...) \
361 (struct property_entry) { \
363 .length = sizeof(struct software_node_ref_args), \
364 .type = DEV_PROP_REF, \
365 { .pointer = &(const struct software_node_ref_args) { \
367 .nargs = ARRAY_SIZE(((u64[]){ 0, ##__VA_ARGS__ })) - 1, \
368 .args = { __VA_ARGS__ }, \
372 struct property_entry *
373 property_entries_dup(const struct property_entry *properties);
375 void property_entries_free(const struct property_entry *properties);
377 int device_add_properties(struct device *dev,
378 const struct property_entry *properties);
379 void device_remove_properties(struct device *dev);
381 bool device_dma_supported(struct device *dev);
383 enum dev_dma_attr device_get_dma_attr(struct device *dev);
385 const void *device_get_match_data(struct device *dev);
387 int device_get_phy_mode(struct device *dev);
389 void *device_get_mac_address(struct device *dev, char *addr, int alen);
391 int fwnode_get_phy_mode(struct fwnode_handle *fwnode);
392 void *fwnode_get_mac_address(struct fwnode_handle *fwnode,
393 char *addr, int alen);
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 int software_node_notify(struct device *dev, unsigned long action);
486 struct fwnode_handle *
487 fwnode_create_software_node(const struct property_entry *properties,
488 const struct fwnode_handle *parent);
489 void fwnode_remove_software_node(struct fwnode_handle *fwnode);
491 #endif /* _LINUX_PROPERTY_H_ */