1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * property.h - Unified device property interface.
5 * Copyright (C) 2014, Intel Corporation
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(const 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_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);
75 bool fwnode_device_is_available(const struct fwnode_handle *fwnode);
78 bool fwnode_device_is_compatible(const struct fwnode_handle *fwnode, const char *compat)
80 return fwnode_property_match_string(fwnode, "compatible", compat) >= 0;
83 int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
84 const char *prop, const char *nargs_prop,
85 unsigned int nargs, unsigned int index,
86 struct fwnode_reference_args *args);
88 struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
92 const char *fwnode_get_name(const struct fwnode_handle *fwnode);
93 const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode);
95 struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
96 struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode);
98 #define fwnode_for_each_parent_node(fwnode, parent) \
99 for (parent = fwnode_get_parent(fwnode); parent; \
100 parent = fwnode_get_next_parent(parent))
102 struct device *fwnode_get_next_parent_dev(struct fwnode_handle *fwnode);
103 unsigned int fwnode_count_parents(const struct fwnode_handle *fwn);
104 struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwn,
106 bool fwnode_is_ancestor_of(struct fwnode_handle *ancestor, struct fwnode_handle *child);
107 struct fwnode_handle *fwnode_get_next_child_node(
108 const struct fwnode_handle *fwnode, struct fwnode_handle *child);
109 struct fwnode_handle *fwnode_get_next_available_child_node(
110 const struct fwnode_handle *fwnode, struct fwnode_handle *child);
112 #define fwnode_for_each_child_node(fwnode, child) \
113 for (child = fwnode_get_next_child_node(fwnode, NULL); child; \
114 child = fwnode_get_next_child_node(fwnode, child))
116 #define fwnode_for_each_available_child_node(fwnode, child) \
117 for (child = fwnode_get_next_available_child_node(fwnode, NULL); child;\
118 child = fwnode_get_next_available_child_node(fwnode, child))
120 struct fwnode_handle *device_get_next_child_node(
121 struct device *dev, struct fwnode_handle *child);
123 #define device_for_each_child_node(dev, child) \
124 for (child = device_get_next_child_node(dev, NULL); child; \
125 child = device_get_next_child_node(dev, child))
127 struct fwnode_handle *fwnode_get_named_child_node(
128 const struct fwnode_handle *fwnode, const char *childname);
129 struct fwnode_handle *device_get_named_child_node(struct device *dev,
130 const char *childname);
132 struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);
133 void fwnode_handle_put(struct fwnode_handle *fwnode);
135 int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index);
136 int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name);
138 unsigned int device_get_child_node_count(struct device *dev);
140 static inline bool device_property_read_bool(struct device *dev,
141 const char *propname)
143 return device_property_present(dev, propname);
146 static inline int device_property_read_u8(struct device *dev,
147 const char *propname, u8 *val)
149 return device_property_read_u8_array(dev, propname, val, 1);
152 static inline int device_property_read_u16(struct device *dev,
153 const char *propname, u16 *val)
155 return device_property_read_u16_array(dev, propname, val, 1);
158 static inline int device_property_read_u32(struct device *dev,
159 const char *propname, u32 *val)
161 return device_property_read_u32_array(dev, propname, val, 1);
164 static inline int device_property_read_u64(struct device *dev,
165 const char *propname, u64 *val)
167 return device_property_read_u64_array(dev, propname, val, 1);
170 static inline int device_property_count_u8(struct device *dev, const char *propname)
172 return device_property_read_u8_array(dev, propname, NULL, 0);
175 static inline int device_property_count_u16(struct device *dev, const char *propname)
177 return device_property_read_u16_array(dev, propname, NULL, 0);
180 static inline int device_property_count_u32(struct device *dev, const char *propname)
182 return device_property_read_u32_array(dev, propname, NULL, 0);
185 static inline int device_property_count_u64(struct device *dev, const char *propname)
187 return device_property_read_u64_array(dev, propname, NULL, 0);
190 static inline int device_property_string_array_count(struct device *dev,
191 const char *propname)
193 return device_property_read_string_array(dev, propname, NULL, 0);
196 static inline bool fwnode_property_read_bool(const struct fwnode_handle *fwnode,
197 const char *propname)
199 return fwnode_property_present(fwnode, propname);
202 static inline int fwnode_property_read_u8(const struct fwnode_handle *fwnode,
203 const char *propname, u8 *val)
205 return fwnode_property_read_u8_array(fwnode, propname, val, 1);
208 static inline int fwnode_property_read_u16(const struct fwnode_handle *fwnode,
209 const char *propname, u16 *val)
211 return fwnode_property_read_u16_array(fwnode, propname, val, 1);
214 static inline int fwnode_property_read_u32(const struct fwnode_handle *fwnode,
215 const char *propname, u32 *val)
217 return fwnode_property_read_u32_array(fwnode, propname, val, 1);
220 static inline int fwnode_property_read_u64(const struct fwnode_handle *fwnode,
221 const char *propname, u64 *val)
223 return fwnode_property_read_u64_array(fwnode, propname, val, 1);
226 static inline int fwnode_property_count_u8(const struct fwnode_handle *fwnode,
227 const char *propname)
229 return fwnode_property_read_u8_array(fwnode, propname, NULL, 0);
232 static inline int fwnode_property_count_u16(const struct fwnode_handle *fwnode,
233 const char *propname)
235 return fwnode_property_read_u16_array(fwnode, propname, NULL, 0);
238 static inline int fwnode_property_count_u32(const struct fwnode_handle *fwnode,
239 const char *propname)
241 return fwnode_property_read_u32_array(fwnode, propname, NULL, 0);
244 static inline int fwnode_property_count_u64(const struct fwnode_handle *fwnode,
245 const char *propname)
247 return fwnode_property_read_u64_array(fwnode, propname, NULL, 0);
251 fwnode_property_string_array_count(const struct fwnode_handle *fwnode,
252 const char *propname)
254 return fwnode_property_read_string_array(fwnode, propname, NULL, 0);
257 struct software_node;
260 * struct software_node_ref_args - Reference property with additional arguments
261 * @node: Reference to a software node
262 * @nargs: Number of elements in @args array
263 * @args: Integer arguments
265 struct software_node_ref_args {
266 const struct software_node *node;
268 u64 args[NR_FWNODE_REFERENCE_ARGS];
271 #define SOFTWARE_NODE_REFERENCE(_ref_, ...) \
272 (const struct software_node_ref_args) { \
274 .nargs = ARRAY_SIZE(((u64[]){ 0, ##__VA_ARGS__ })) - 1, \
275 .args = { __VA_ARGS__ }, \
279 * struct property_entry - "Built-in" device property representation.
280 * @name: Name of the property.
281 * @length: Length of data making up the value.
282 * @is_inline: True when the property value is stored inline.
283 * @type: Type of the data in unions.
284 * @pointer: Pointer to the property when it is not stored inline.
285 * @value: Value of the property when it is stored inline.
287 struct property_entry {
291 enum dev_prop_type type;
295 u8 u8_data[sizeof(u64) / sizeof(u8)];
296 u16 u16_data[sizeof(u64) / sizeof(u16)];
297 u32 u32_data[sizeof(u64) / sizeof(u32)];
298 u64 u64_data[sizeof(u64) / sizeof(u64)];
299 const char *str[sizeof(u64) / sizeof(char *)];
305 * Note: the below initializers for the anonymous union are carefully
306 * crafted to avoid gcc-4.4.4's problems with initialization of anon unions
310 #define __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_) \
311 sizeof(((struct property_entry *)NULL)->value._elem_[0])
313 #define __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, _elsize_, _Type_, \
315 (struct property_entry) { \
317 .length = (_len_) * (_elsize_), \
318 .type = DEV_PROP_##_Type_, \
319 { .pointer = _val_ }, \
322 #define __PROPERTY_ENTRY_ARRAY_LEN(_name_, _elem_, _Type_, _val_, _len_)\
323 __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \
324 __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \
325 _Type_, _val_, _len_)
327 #define PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, _len_) \
328 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u8_data, U8, _val_, _len_)
329 #define PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, _len_) \
330 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u16_data, U16, _val_, _len_)
331 #define PROPERTY_ENTRY_U32_ARRAY_LEN(_name_, _val_, _len_) \
332 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u32_data, U32, _val_, _len_)
333 #define PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, _len_) \
334 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u64_data, U64, _val_, _len_)
335 #define PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, _len_) \
336 __PROPERTY_ENTRY_ARRAY_LEN(_name_, str, STRING, _val_, _len_)
337 #define PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, _len_) \
338 __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \
339 sizeof(struct software_node_ref_args), \
342 #define PROPERTY_ENTRY_U8_ARRAY(_name_, _val_) \
343 PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
344 #define PROPERTY_ENTRY_U16_ARRAY(_name_, _val_) \
345 PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
346 #define PROPERTY_ENTRY_U32_ARRAY(_name_, _val_) \
347 PROPERTY_ENTRY_U32_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
348 #define PROPERTY_ENTRY_U64_ARRAY(_name_, _val_) \
349 PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
350 #define PROPERTY_ENTRY_STRING_ARRAY(_name_, _val_) \
351 PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
352 #define PROPERTY_ENTRY_REF_ARRAY(_name_, _val_) \
353 PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
355 #define __PROPERTY_ENTRY_ELEMENT(_name_, _elem_, _Type_, _val_) \
356 (struct property_entry) { \
358 .length = __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \
360 .type = DEV_PROP_##_Type_, \
361 { .value = { ._elem_[0] = _val_ } }, \
364 #define PROPERTY_ENTRY_U8(_name_, _val_) \
365 __PROPERTY_ENTRY_ELEMENT(_name_, u8_data, U8, _val_)
366 #define PROPERTY_ENTRY_U16(_name_, _val_) \
367 __PROPERTY_ENTRY_ELEMENT(_name_, u16_data, U16, _val_)
368 #define PROPERTY_ENTRY_U32(_name_, _val_) \
369 __PROPERTY_ENTRY_ELEMENT(_name_, u32_data, U32, _val_)
370 #define PROPERTY_ENTRY_U64(_name_, _val_) \
371 __PROPERTY_ENTRY_ELEMENT(_name_, u64_data, U64, _val_)
372 #define PROPERTY_ENTRY_STRING(_name_, _val_) \
373 __PROPERTY_ENTRY_ELEMENT(_name_, str, STRING, _val_)
375 #define PROPERTY_ENTRY_BOOL(_name_) \
376 (struct property_entry) { \
381 #define PROPERTY_ENTRY_REF(_name_, _ref_, ...) \
382 (struct property_entry) { \
384 .length = sizeof(struct software_node_ref_args), \
385 .type = DEV_PROP_REF, \
386 { .pointer = &SOFTWARE_NODE_REFERENCE(_ref_, ##__VA_ARGS__), }, \
389 struct property_entry *
390 property_entries_dup(const struct property_entry *properties);
392 void property_entries_free(const struct property_entry *properties);
394 bool device_dma_supported(struct device *dev);
396 enum dev_dma_attr device_get_dma_attr(struct device *dev);
398 const void *device_get_match_data(const struct device *dev);
400 int device_get_phy_mode(struct device *dev);
401 int fwnode_get_phy_mode(struct fwnode_handle *fwnode);
403 void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index);
405 struct fwnode_handle *fwnode_graph_get_next_endpoint(
406 const struct fwnode_handle *fwnode, struct fwnode_handle *prev);
407 struct fwnode_handle *
408 fwnode_graph_get_port_parent(const struct fwnode_handle *fwnode);
409 struct fwnode_handle *fwnode_graph_get_remote_port_parent(
410 const struct fwnode_handle *fwnode);
411 struct fwnode_handle *fwnode_graph_get_remote_port(
412 const struct fwnode_handle *fwnode);
413 struct fwnode_handle *fwnode_graph_get_remote_endpoint(
414 const struct fwnode_handle *fwnode);
416 static inline bool fwnode_graph_is_endpoint(struct fwnode_handle *fwnode)
418 return fwnode_property_present(fwnode, "remote-endpoint");
422 * Fwnode lookup flags
424 * @FWNODE_GRAPH_ENDPOINT_NEXT: In the case of no exact match, look for the
425 * closest endpoint ID greater than the specified
427 * @FWNODE_GRAPH_DEVICE_DISABLED: That the device to which the remote
428 * endpoint of the given endpoint belongs to,
429 * may be disabled, or that the endpoint is not
432 #define FWNODE_GRAPH_ENDPOINT_NEXT BIT(0)
433 #define FWNODE_GRAPH_DEVICE_DISABLED BIT(1)
435 struct fwnode_handle *
436 fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode,
437 u32 port, u32 endpoint, unsigned long flags);
438 unsigned int fwnode_graph_get_endpoint_count(struct fwnode_handle *fwnode,
439 unsigned long flags);
441 #define fwnode_graph_for_each_endpoint(fwnode, child) \
443 (child = fwnode_graph_get_next_endpoint(fwnode, child)); )
445 int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
446 struct fwnode_endpoint *endpoint);
448 typedef void *(*devcon_match_fn_t)(struct fwnode_handle *fwnode, const char *id,
451 void *fwnode_connection_find_match(struct fwnode_handle *fwnode,
452 const char *con_id, void *data,
453 devcon_match_fn_t match);
455 static inline void *device_connection_find_match(struct device *dev,
456 const char *con_id, void *data,
457 devcon_match_fn_t match)
459 return fwnode_connection_find_match(dev_fwnode(dev), con_id, data, match);
462 int fwnode_connection_find_matches(struct fwnode_handle *fwnode,
463 const char *con_id, void *data,
464 devcon_match_fn_t match,
465 void **matches, unsigned int matches_len);
467 /* -------------------------------------------------------------------------- */
468 /* Software fwnode support - when HW description is incomplete or missing */
471 * struct software_node - Software node description
472 * @name: Name of the software node
473 * @parent: Parent of the software node
474 * @properties: Array of device properties
476 struct software_node {
478 const struct software_node *parent;
479 const struct property_entry *properties;
482 bool is_software_node(const struct fwnode_handle *fwnode);
483 const struct software_node *
484 to_software_node(const struct fwnode_handle *fwnode);
485 struct fwnode_handle *software_node_fwnode(const struct software_node *node);
487 const struct software_node *
488 software_node_find_by_name(const struct software_node *parent,
491 int software_node_register_nodes(const struct software_node *nodes);
492 void software_node_unregister_nodes(const struct software_node *nodes);
494 int software_node_register_node_group(const struct software_node **node_group);
495 void software_node_unregister_node_group(const struct software_node **node_group);
497 int software_node_register(const struct software_node *node);
498 void software_node_unregister(const struct software_node *node);
500 struct fwnode_handle *
501 fwnode_create_software_node(const struct property_entry *properties,
502 const struct fwnode_handle *parent);
503 void fwnode_remove_software_node(struct fwnode_handle *fwnode);
505 int device_add_software_node(struct device *dev, const struct software_node *node);
506 void device_remove_software_node(struct device *dev);
508 int device_create_managed_software_node(struct device *dev,
509 const struct property_entry *properties,
510 const struct software_node *parent);
512 #endif /* _LINUX_PROPERTY_H_ */