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);
124 int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name);
126 unsigned int device_get_child_node_count(struct device *dev);
128 static inline bool device_property_read_bool(struct device *dev,
129 const char *propname)
131 return device_property_present(dev, propname);
134 static inline int device_property_read_u8(struct device *dev,
135 const char *propname, u8 *val)
137 return device_property_read_u8_array(dev, propname, val, 1);
140 static inline int device_property_read_u16(struct device *dev,
141 const char *propname, u16 *val)
143 return device_property_read_u16_array(dev, propname, val, 1);
146 static inline int device_property_read_u32(struct device *dev,
147 const char *propname, u32 *val)
149 return device_property_read_u32_array(dev, propname, val, 1);
152 static inline int device_property_read_u64(struct device *dev,
153 const char *propname, u64 *val)
155 return device_property_read_u64_array(dev, propname, val, 1);
158 static inline int device_property_count_u8(struct device *dev, const char *propname)
160 return device_property_read_u8_array(dev, propname, NULL, 0);
163 static inline int device_property_count_u16(struct device *dev, const char *propname)
165 return device_property_read_u16_array(dev, propname, NULL, 0);
168 static inline int device_property_count_u32(struct device *dev, const char *propname)
170 return device_property_read_u32_array(dev, propname, NULL, 0);
173 static inline int device_property_count_u64(struct device *dev, const char *propname)
175 return device_property_read_u64_array(dev, propname, NULL, 0);
178 static inline int device_property_string_array_count(struct device *dev,
179 const char *propname)
181 return device_property_read_string_array(dev, propname, NULL, 0);
184 static inline bool fwnode_property_read_bool(const struct fwnode_handle *fwnode,
185 const char *propname)
187 return fwnode_property_present(fwnode, propname);
190 static inline int fwnode_property_read_u8(const struct fwnode_handle *fwnode,
191 const char *propname, u8 *val)
193 return fwnode_property_read_u8_array(fwnode, propname, val, 1);
196 static inline int fwnode_property_read_u16(const struct fwnode_handle *fwnode,
197 const char *propname, u16 *val)
199 return fwnode_property_read_u16_array(fwnode, propname, val, 1);
202 static inline int fwnode_property_read_u32(const struct fwnode_handle *fwnode,
203 const char *propname, u32 *val)
205 return fwnode_property_read_u32_array(fwnode, propname, val, 1);
208 static inline int fwnode_property_read_u64(const struct fwnode_handle *fwnode,
209 const char *propname, u64 *val)
211 return fwnode_property_read_u64_array(fwnode, propname, val, 1);
214 static inline int fwnode_property_count_u8(const struct fwnode_handle *fwnode,
215 const char *propname)
217 return fwnode_property_read_u8_array(fwnode, propname, NULL, 0);
220 static inline int fwnode_property_count_u16(const struct fwnode_handle *fwnode,
221 const char *propname)
223 return fwnode_property_read_u16_array(fwnode, propname, NULL, 0);
226 static inline int fwnode_property_count_u32(const struct fwnode_handle *fwnode,
227 const char *propname)
229 return fwnode_property_read_u32_array(fwnode, propname, NULL, 0);
232 static inline int fwnode_property_count_u64(const struct fwnode_handle *fwnode,
233 const char *propname)
235 return fwnode_property_read_u64_array(fwnode, propname, NULL, 0);
239 fwnode_property_string_array_count(const struct fwnode_handle *fwnode,
240 const char *propname)
242 return fwnode_property_read_string_array(fwnode, propname, NULL, 0);
245 struct software_node;
248 * struct software_node_ref_args - Reference property with additional arguments
249 * @node: Reference to a software node
250 * @nargs: Number of elements in @args array
251 * @args: Integer arguments
253 struct software_node_ref_args {
254 const struct software_node *node;
256 u64 args[NR_FWNODE_REFERENCE_ARGS];
259 #define SOFTWARE_NODE_REFERENCE(_ref_, ...) \
260 (const struct software_node_ref_args) { \
262 .nargs = ARRAY_SIZE(((u64[]){ 0, ##__VA_ARGS__ })) - 1, \
263 .args = { __VA_ARGS__ }, \
267 * struct property_entry - "Built-in" device property representation.
268 * @name: Name of the property.
269 * @length: Length of data making up the value.
270 * @is_inline: True when the property value is stored inline.
271 * @type: Type of the data in unions.
272 * @pointer: Pointer to the property when it is not stored inline.
273 * @value: Value of the property when it is stored inline.
275 struct property_entry {
279 enum dev_prop_type type;
283 u8 u8_data[sizeof(u64) / sizeof(u8)];
284 u16 u16_data[sizeof(u64) / sizeof(u16)];
285 u32 u32_data[sizeof(u64) / sizeof(u32)];
286 u64 u64_data[sizeof(u64) / sizeof(u64)];
287 const char *str[sizeof(u64) / sizeof(char *)];
293 * Note: the below initializers for the anonymous union are carefully
294 * crafted to avoid gcc-4.4.4's problems with initialization of anon unions
298 #define __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_) \
299 sizeof(((struct property_entry *)NULL)->value._elem_[0])
301 #define __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, _elsize_, _Type_, \
303 (struct property_entry) { \
305 .length = (_len_) * (_elsize_), \
306 .type = DEV_PROP_##_Type_, \
307 { .pointer = _val_ }, \
310 #define __PROPERTY_ENTRY_ARRAY_LEN(_name_, _elem_, _Type_, _val_, _len_)\
311 __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \
312 __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \
313 _Type_, _val_, _len_)
315 #define PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, _len_) \
316 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u8_data, U8, _val_, _len_)
317 #define PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, _len_) \
318 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u16_data, U16, _val_, _len_)
319 #define PROPERTY_ENTRY_U32_ARRAY_LEN(_name_, _val_, _len_) \
320 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u32_data, U32, _val_, _len_)
321 #define PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, _len_) \
322 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u64_data, U64, _val_, _len_)
323 #define PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, _len_) \
324 __PROPERTY_ENTRY_ARRAY_LEN(_name_, str, STRING, _val_, _len_)
325 #define PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, _len_) \
326 __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \
327 sizeof(struct software_node_ref_args), \
330 #define PROPERTY_ENTRY_U8_ARRAY(_name_, _val_) \
331 PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
332 #define PROPERTY_ENTRY_U16_ARRAY(_name_, _val_) \
333 PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
334 #define PROPERTY_ENTRY_U32_ARRAY(_name_, _val_) \
335 PROPERTY_ENTRY_U32_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
336 #define PROPERTY_ENTRY_U64_ARRAY(_name_, _val_) \
337 PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
338 #define PROPERTY_ENTRY_STRING_ARRAY(_name_, _val_) \
339 PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
340 #define PROPERTY_ENTRY_REF_ARRAY(_name_, _val_) \
341 PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
343 #define __PROPERTY_ENTRY_ELEMENT(_name_, _elem_, _Type_, _val_) \
344 (struct property_entry) { \
346 .length = __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \
348 .type = DEV_PROP_##_Type_, \
349 { .value = { ._elem_[0] = _val_ } }, \
352 #define PROPERTY_ENTRY_U8(_name_, _val_) \
353 __PROPERTY_ENTRY_ELEMENT(_name_, u8_data, U8, _val_)
354 #define PROPERTY_ENTRY_U16(_name_, _val_) \
355 __PROPERTY_ENTRY_ELEMENT(_name_, u16_data, U16, _val_)
356 #define PROPERTY_ENTRY_U32(_name_, _val_) \
357 __PROPERTY_ENTRY_ELEMENT(_name_, u32_data, U32, _val_)
358 #define PROPERTY_ENTRY_U64(_name_, _val_) \
359 __PROPERTY_ENTRY_ELEMENT(_name_, u64_data, U64, _val_)
360 #define PROPERTY_ENTRY_STRING(_name_, _val_) \
361 __PROPERTY_ENTRY_ELEMENT(_name_, str, STRING, _val_)
363 #define PROPERTY_ENTRY_BOOL(_name_) \
364 (struct property_entry) { \
369 #define PROPERTY_ENTRY_REF(_name_, _ref_, ...) \
370 (struct property_entry) { \
372 .length = sizeof(struct software_node_ref_args), \
373 .type = DEV_PROP_REF, \
374 { .pointer = &SOFTWARE_NODE_REFERENCE(_ref_, ##__VA_ARGS__), }, \
377 struct property_entry *
378 property_entries_dup(const struct property_entry *properties);
380 void property_entries_free(const struct property_entry *properties);
382 bool device_dma_supported(struct device *dev);
384 enum dev_dma_attr device_get_dma_attr(struct device *dev);
386 const void *device_get_match_data(struct device *dev);
388 int device_get_phy_mode(struct device *dev);
389 int fwnode_get_phy_mode(struct fwnode_handle *fwnode);
391 void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index);
393 struct fwnode_handle *fwnode_graph_get_next_endpoint(
394 const struct fwnode_handle *fwnode, struct fwnode_handle *prev);
395 struct fwnode_handle *
396 fwnode_graph_get_port_parent(const struct fwnode_handle *fwnode);
397 struct fwnode_handle *fwnode_graph_get_remote_port_parent(
398 const struct fwnode_handle *fwnode);
399 struct fwnode_handle *fwnode_graph_get_remote_port(
400 const struct fwnode_handle *fwnode);
401 struct fwnode_handle *fwnode_graph_get_remote_endpoint(
402 const struct fwnode_handle *fwnode);
404 static inline bool fwnode_graph_is_endpoint(struct fwnode_handle *fwnode)
406 return fwnode_property_present(fwnode, "remote-endpoint");
410 * Fwnode lookup flags
412 * @FWNODE_GRAPH_ENDPOINT_NEXT: In the case of no exact match, look for the
413 * closest endpoint ID greater than the specified
415 * @FWNODE_GRAPH_DEVICE_DISABLED: That the device to which the remote
416 * endpoint of the given endpoint belongs to,
417 * may be disabled, or that the endpoint is not
420 #define FWNODE_GRAPH_ENDPOINT_NEXT BIT(0)
421 #define FWNODE_GRAPH_DEVICE_DISABLED BIT(1)
423 struct fwnode_handle *
424 fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode,
425 u32 port, u32 endpoint, unsigned long flags);
426 unsigned int fwnode_graph_get_endpoint_count(struct fwnode_handle *fwnode,
427 unsigned long flags);
429 #define fwnode_graph_for_each_endpoint(fwnode, child) \
431 (child = fwnode_graph_get_next_endpoint(fwnode, child)); )
433 int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
434 struct fwnode_endpoint *endpoint);
436 typedef void *(*devcon_match_fn_t)(struct fwnode_handle *fwnode, const char *id,
439 void *fwnode_connection_find_match(struct fwnode_handle *fwnode,
440 const char *con_id, void *data,
441 devcon_match_fn_t match);
443 static inline void *device_connection_find_match(struct device *dev,
444 const char *con_id, void *data,
445 devcon_match_fn_t match)
447 return fwnode_connection_find_match(dev_fwnode(dev), con_id, data, match);
450 /* -------------------------------------------------------------------------- */
451 /* Software fwnode support - when HW description is incomplete or missing */
454 * struct software_node - Software node description
455 * @name: Name of the software node
456 * @parent: Parent of the software node
457 * @properties: Array of device properties
459 struct software_node {
461 const struct software_node *parent;
462 const struct property_entry *properties;
465 bool is_software_node(const struct fwnode_handle *fwnode);
466 const struct software_node *
467 to_software_node(const struct fwnode_handle *fwnode);
468 struct fwnode_handle *software_node_fwnode(const struct software_node *node);
470 const struct software_node *
471 software_node_find_by_name(const struct software_node *parent,
474 int software_node_register_nodes(const struct software_node *nodes);
475 void software_node_unregister_nodes(const struct software_node *nodes);
477 int software_node_register_node_group(const struct software_node **node_group);
478 void software_node_unregister_node_group(const struct software_node **node_group);
480 int software_node_register(const struct software_node *node);
481 void software_node_unregister(const struct software_node *node);
483 struct fwnode_handle *
484 fwnode_create_software_node(const struct property_entry *properties,
485 const struct fwnode_handle *parent);
486 void fwnode_remove_software_node(struct fwnode_handle *fwnode);
488 int device_add_software_node(struct device *dev, const struct software_node *node);
489 void device_remove_software_node(struct device *dev);
491 int device_create_managed_software_node(struct device *dev,
492 const struct property_entry *properties,
493 const struct software_node *parent);
495 #endif /* _LINUX_PROPERTY_H_ */