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 void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index);
127 unsigned int device_get_child_node_count(struct device *dev);
129 static inline bool device_property_read_bool(struct device *dev,
130 const char *propname)
132 return device_property_present(dev, propname);
135 static inline int device_property_read_u8(struct device *dev,
136 const char *propname, u8 *val)
138 return device_property_read_u8_array(dev, propname, val, 1);
141 static inline int device_property_read_u16(struct device *dev,
142 const char *propname, u16 *val)
144 return device_property_read_u16_array(dev, propname, val, 1);
147 static inline int device_property_read_u32(struct device *dev,
148 const char *propname, u32 *val)
150 return device_property_read_u32_array(dev, propname, val, 1);
153 static inline int device_property_read_u64(struct device *dev,
154 const char *propname, u64 *val)
156 return device_property_read_u64_array(dev, propname, val, 1);
159 static inline int device_property_count_u8(struct device *dev, const char *propname)
161 return device_property_read_u8_array(dev, propname, NULL, 0);
164 static inline int device_property_count_u16(struct device *dev, const char *propname)
166 return device_property_read_u16_array(dev, propname, NULL, 0);
169 static inline int device_property_count_u32(struct device *dev, const char *propname)
171 return device_property_read_u32_array(dev, propname, NULL, 0);
174 static inline int device_property_count_u64(struct device *dev, const char *propname)
176 return device_property_read_u64_array(dev, propname, NULL, 0);
179 static inline int device_property_string_array_count(struct device *dev,
180 const char *propname)
182 return device_property_read_string_array(dev, propname, NULL, 0);
185 static inline bool fwnode_property_read_bool(const struct fwnode_handle *fwnode,
186 const char *propname)
188 return fwnode_property_present(fwnode, propname);
191 static inline int fwnode_property_read_u8(const struct fwnode_handle *fwnode,
192 const char *propname, u8 *val)
194 return fwnode_property_read_u8_array(fwnode, propname, val, 1);
197 static inline int fwnode_property_read_u16(const struct fwnode_handle *fwnode,
198 const char *propname, u16 *val)
200 return fwnode_property_read_u16_array(fwnode, propname, val, 1);
203 static inline int fwnode_property_read_u32(const struct fwnode_handle *fwnode,
204 const char *propname, u32 *val)
206 return fwnode_property_read_u32_array(fwnode, propname, val, 1);
209 static inline int fwnode_property_read_u64(const struct fwnode_handle *fwnode,
210 const char *propname, u64 *val)
212 return fwnode_property_read_u64_array(fwnode, propname, val, 1);
215 static inline int fwnode_property_count_u8(const struct fwnode_handle *fwnode,
216 const char *propname)
218 return fwnode_property_read_u8_array(fwnode, propname, NULL, 0);
221 static inline int fwnode_property_count_u16(const struct fwnode_handle *fwnode,
222 const char *propname)
224 return fwnode_property_read_u16_array(fwnode, propname, NULL, 0);
227 static inline int fwnode_property_count_u32(const struct fwnode_handle *fwnode,
228 const char *propname)
230 return fwnode_property_read_u32_array(fwnode, propname, NULL, 0);
233 static inline int fwnode_property_count_u64(const struct fwnode_handle *fwnode,
234 const char *propname)
236 return fwnode_property_read_u64_array(fwnode, propname, NULL, 0);
240 fwnode_property_string_array_count(const struct fwnode_handle *fwnode,
241 const char *propname)
243 return fwnode_property_read_string_array(fwnode, propname, NULL, 0);
246 struct software_node;
249 * struct software_node_ref_args - Reference property with additional arguments
250 * @node: Reference to a software node
251 * @nargs: Number of elements in @args array
252 * @args: Integer arguments
254 struct software_node_ref_args {
255 const struct software_node *node;
257 u64 args[NR_FWNODE_REFERENCE_ARGS];
260 #define SOFTWARE_NODE_REFERENCE(_ref_, ...) \
261 (const struct software_node_ref_args) { \
263 .nargs = ARRAY_SIZE(((u64[]){ 0, ##__VA_ARGS__ })) - 1, \
264 .args = { __VA_ARGS__ }, \
268 * struct property_entry - "Built-in" device property representation.
269 * @name: Name of the property.
270 * @length: Length of data making up the value.
271 * @is_inline: True when the property value is stored inline.
272 * @type: Type of the data in unions.
273 * @pointer: Pointer to the property when it is not stored inline.
274 * @value: Value of the property when it is stored inline.
276 struct property_entry {
280 enum dev_prop_type type;
284 u8 u8_data[sizeof(u64) / sizeof(u8)];
285 u16 u16_data[sizeof(u64) / sizeof(u16)];
286 u32 u32_data[sizeof(u64) / sizeof(u32)];
287 u64 u64_data[sizeof(u64) / sizeof(u64)];
288 const char *str[sizeof(u64) / sizeof(char *)];
294 * Note: the below initializers for the anonymous union are carefully
295 * crafted to avoid gcc-4.4.4's problems with initialization of anon unions
299 #define __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_) \
300 sizeof(((struct property_entry *)NULL)->value._elem_[0])
302 #define __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, _elsize_, _Type_, \
304 (struct property_entry) { \
306 .length = (_len_) * (_elsize_), \
307 .type = DEV_PROP_##_Type_, \
308 { .pointer = _val_ }, \
311 #define __PROPERTY_ENTRY_ARRAY_LEN(_name_, _elem_, _Type_, _val_, _len_)\
312 __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \
313 __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \
314 _Type_, _val_, _len_)
316 #define PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, _len_) \
317 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u8_data, U8, _val_, _len_)
318 #define PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, _len_) \
319 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u16_data, U16, _val_, _len_)
320 #define PROPERTY_ENTRY_U32_ARRAY_LEN(_name_, _val_, _len_) \
321 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u32_data, U32, _val_, _len_)
322 #define PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, _len_) \
323 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u64_data, U64, _val_, _len_)
324 #define PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, _len_) \
325 __PROPERTY_ENTRY_ARRAY_LEN(_name_, str, STRING, _val_, _len_)
326 #define PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, _len_) \
327 __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \
328 sizeof(struct software_node_ref_args), \
331 #define PROPERTY_ENTRY_U8_ARRAY(_name_, _val_) \
332 PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
333 #define PROPERTY_ENTRY_U16_ARRAY(_name_, _val_) \
334 PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
335 #define PROPERTY_ENTRY_U32_ARRAY(_name_, _val_) \
336 PROPERTY_ENTRY_U32_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
337 #define PROPERTY_ENTRY_U64_ARRAY(_name_, _val_) \
338 PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
339 #define PROPERTY_ENTRY_STRING_ARRAY(_name_, _val_) \
340 PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
341 #define PROPERTY_ENTRY_REF_ARRAY(_name_, _val_) \
342 PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
344 #define __PROPERTY_ENTRY_ELEMENT(_name_, _elem_, _Type_, _val_) \
345 (struct property_entry) { \
347 .length = __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \
349 .type = DEV_PROP_##_Type_, \
350 { .value = { ._elem_[0] = _val_ } }, \
353 #define PROPERTY_ENTRY_U8(_name_, _val_) \
354 __PROPERTY_ENTRY_ELEMENT(_name_, u8_data, U8, _val_)
355 #define PROPERTY_ENTRY_U16(_name_, _val_) \
356 __PROPERTY_ENTRY_ELEMENT(_name_, u16_data, U16, _val_)
357 #define PROPERTY_ENTRY_U32(_name_, _val_) \
358 __PROPERTY_ENTRY_ELEMENT(_name_, u32_data, U32, _val_)
359 #define PROPERTY_ENTRY_U64(_name_, _val_) \
360 __PROPERTY_ENTRY_ELEMENT(_name_, u64_data, U64, _val_)
361 #define PROPERTY_ENTRY_STRING(_name_, _val_) \
362 __PROPERTY_ENTRY_ELEMENT(_name_, str, STRING, _val_)
364 #define PROPERTY_ENTRY_BOOL(_name_) \
365 (struct property_entry) { \
370 #define PROPERTY_ENTRY_REF(_name_, _ref_, ...) \
371 (struct property_entry) { \
373 .length = sizeof(struct software_node_ref_args), \
374 .type = DEV_PROP_REF, \
375 { .pointer = &SOFTWARE_NODE_REFERENCE(_ref_, ##__VA_ARGS__), }, \
378 struct property_entry *
379 property_entries_dup(const struct property_entry *properties);
381 void property_entries_free(const struct property_entry *properties);
383 bool device_dma_supported(struct device *dev);
385 enum dev_dma_attr device_get_dma_attr(struct device *dev);
387 const void *device_get_match_data(struct device *dev);
389 int device_get_phy_mode(struct device *dev);
391 int fwnode_get_phy_mode(struct fwnode_handle *fwnode);
392 struct fwnode_handle *fwnode_graph_get_next_endpoint(
393 const struct fwnode_handle *fwnode, struct fwnode_handle *prev);
394 struct fwnode_handle *
395 fwnode_graph_get_port_parent(const struct fwnode_handle *fwnode);
396 struct fwnode_handle *fwnode_graph_get_remote_port_parent(
397 const struct fwnode_handle *fwnode);
398 struct fwnode_handle *fwnode_graph_get_remote_port(
399 const struct fwnode_handle *fwnode);
400 struct fwnode_handle *fwnode_graph_get_remote_endpoint(
401 const struct fwnode_handle *fwnode);
403 static inline bool fwnode_graph_is_endpoint(struct fwnode_handle *fwnode)
405 return fwnode_property_present(fwnode, "remote-endpoint");
409 * Fwnode lookup flags
411 * @FWNODE_GRAPH_ENDPOINT_NEXT: In the case of no exact match, look for the
412 * closest endpoint ID greater than the specified
414 * @FWNODE_GRAPH_DEVICE_DISABLED: That the device to which the remote
415 * endpoint of the given endpoint belongs to,
416 * may be disabled, or that the endpoint is not
419 #define FWNODE_GRAPH_ENDPOINT_NEXT BIT(0)
420 #define FWNODE_GRAPH_DEVICE_DISABLED BIT(1)
422 struct fwnode_handle *
423 fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode,
424 u32 port, u32 endpoint, unsigned long flags);
425 unsigned int fwnode_graph_get_endpoint_count(struct fwnode_handle *fwnode,
426 unsigned long flags);
428 #define fwnode_graph_for_each_endpoint(fwnode, child) \
430 (child = fwnode_graph_get_next_endpoint(fwnode, child)); )
432 int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
433 struct fwnode_endpoint *endpoint);
435 typedef void *(*devcon_match_fn_t)(struct fwnode_handle *fwnode, const char *id,
438 void *fwnode_connection_find_match(struct fwnode_handle *fwnode,
439 const char *con_id, void *data,
440 devcon_match_fn_t match);
442 static inline void *device_connection_find_match(struct device *dev,
443 const char *con_id, void *data,
444 devcon_match_fn_t match)
446 return fwnode_connection_find_match(dev_fwnode(dev), con_id, data, match);
449 /* -------------------------------------------------------------------------- */
450 /* Software fwnode support - when HW description is incomplete or missing */
453 * struct software_node - Software node description
454 * @name: Name of the software node
455 * @parent: Parent of the software node
456 * @properties: Array of device properties
458 struct software_node {
460 const struct software_node *parent;
461 const struct property_entry *properties;
464 bool is_software_node(const struct fwnode_handle *fwnode);
465 const struct software_node *
466 to_software_node(const struct fwnode_handle *fwnode);
467 struct fwnode_handle *software_node_fwnode(const struct software_node *node);
469 const struct software_node *
470 software_node_find_by_name(const struct software_node *parent,
473 int software_node_register_nodes(const struct software_node *nodes);
474 void software_node_unregister_nodes(const struct software_node *nodes);
476 int software_node_register_node_group(const struct software_node **node_group);
477 void software_node_unregister_node_group(const struct software_node **node_group);
479 int software_node_register(const struct software_node *node);
480 void software_node_unregister(const struct software_node *node);
482 struct fwnode_handle *
483 fwnode_create_software_node(const struct property_entry *properties,
484 const struct fwnode_handle *parent);
485 void fwnode_remove_software_node(struct fwnode_handle *fwnode);
487 int device_add_software_node(struct device *dev, const struct software_node *node);
488 void device_remove_software_node(struct device *dev);
490 int device_create_managed_software_node(struct device *dev,
491 const struct property_entry *properties,
492 const struct software_node *parent);
494 #endif /* _LINUX_PROPERTY_H_ */