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 unsigned int fwnode_count_parents(const struct fwnode_handle *fwn);
89 struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwn,
91 struct fwnode_handle *fwnode_get_next_child_node(
92 const struct fwnode_handle *fwnode, struct fwnode_handle *child);
93 struct fwnode_handle *fwnode_get_next_available_child_node(
94 const struct fwnode_handle *fwnode, struct fwnode_handle *child);
96 #define fwnode_for_each_child_node(fwnode, child) \
97 for (child = fwnode_get_next_child_node(fwnode, NULL); child; \
98 child = fwnode_get_next_child_node(fwnode, child))
100 #define fwnode_for_each_available_child_node(fwnode, child) \
101 for (child = fwnode_get_next_available_child_node(fwnode, NULL); child;\
102 child = fwnode_get_next_available_child_node(fwnode, child))
104 struct fwnode_handle *device_get_next_child_node(
105 struct device *dev, struct fwnode_handle *child);
107 #define device_for_each_child_node(dev, child) \
108 for (child = device_get_next_child_node(dev, NULL); child; \
109 child = device_get_next_child_node(dev, child))
111 struct fwnode_handle *fwnode_get_named_child_node(
112 const struct fwnode_handle *fwnode, const char *childname);
113 struct fwnode_handle *device_get_named_child_node(struct device *dev,
114 const char *childname);
116 struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);
117 void fwnode_handle_put(struct fwnode_handle *fwnode);
119 int fwnode_irq_get(struct fwnode_handle *fwnode, unsigned int index);
121 unsigned int device_get_child_node_count(struct device *dev);
123 static inline bool device_property_read_bool(struct device *dev,
124 const char *propname)
126 return device_property_present(dev, propname);
129 static inline int device_property_read_u8(struct device *dev,
130 const char *propname, u8 *val)
132 return device_property_read_u8_array(dev, propname, val, 1);
135 static inline int device_property_read_u16(struct device *dev,
136 const char *propname, u16 *val)
138 return device_property_read_u16_array(dev, propname, val, 1);
141 static inline int device_property_read_u32(struct device *dev,
142 const char *propname, u32 *val)
144 return device_property_read_u32_array(dev, propname, val, 1);
147 static inline int device_property_read_u64(struct device *dev,
148 const char *propname, u64 *val)
150 return device_property_read_u64_array(dev, propname, val, 1);
153 static inline int device_property_count_u8(struct device *dev, const char *propname)
155 return device_property_read_u8_array(dev, propname, NULL, 0);
158 static inline int device_property_count_u16(struct device *dev, const char *propname)
160 return device_property_read_u16_array(dev, propname, NULL, 0);
163 static inline int device_property_count_u32(struct device *dev, const char *propname)
165 return device_property_read_u32_array(dev, propname, NULL, 0);
168 static inline int device_property_count_u64(struct device *dev, const char *propname)
170 return device_property_read_u64_array(dev, propname, NULL, 0);
173 static inline bool fwnode_property_read_bool(const struct fwnode_handle *fwnode,
174 const char *propname)
176 return fwnode_property_present(fwnode, propname);
179 static inline int fwnode_property_read_u8(const struct fwnode_handle *fwnode,
180 const char *propname, u8 *val)
182 return fwnode_property_read_u8_array(fwnode, propname, val, 1);
185 static inline int fwnode_property_read_u16(const struct fwnode_handle *fwnode,
186 const char *propname, u16 *val)
188 return fwnode_property_read_u16_array(fwnode, propname, val, 1);
191 static inline int fwnode_property_read_u32(const struct fwnode_handle *fwnode,
192 const char *propname, u32 *val)
194 return fwnode_property_read_u32_array(fwnode, propname, val, 1);
197 static inline int fwnode_property_read_u64(const struct fwnode_handle *fwnode,
198 const char *propname, u64 *val)
200 return fwnode_property_read_u64_array(fwnode, propname, val, 1);
203 static inline int fwnode_property_count_u8(const struct fwnode_handle *fwnode,
204 const char *propname)
206 return fwnode_property_read_u8_array(fwnode, propname, NULL, 0);
209 static inline int fwnode_property_count_u16(const struct fwnode_handle *fwnode,
210 const char *propname)
212 return fwnode_property_read_u16_array(fwnode, propname, NULL, 0);
215 static inline int fwnode_property_count_u32(const struct fwnode_handle *fwnode,
216 const char *propname)
218 return fwnode_property_read_u32_array(fwnode, propname, NULL, 0);
221 static inline int fwnode_property_count_u64(const struct fwnode_handle *fwnode,
222 const char *propname)
224 return fwnode_property_read_u64_array(fwnode, propname, NULL, 0);
227 struct software_node;
230 * struct software_node_ref_args - Reference property with additional arguments
231 * @node: Reference to a software node
232 * @nargs: Number of elements in @args array
233 * @args: Integer arguments
235 struct software_node_ref_args {
236 const struct software_node *node;
238 u64 args[NR_FWNODE_REFERENCE_ARGS];
242 * struct property_entry - "Built-in" device property representation.
243 * @name: Name of the property.
244 * @length: Length of data making up the value.
245 * @is_inline: True when the property value is stored inline.
246 * @type: Type of the data in unions.
247 * @pointer: Pointer to the property when it is not stored inline.
248 * @value: Value of the property when it is stored inline.
250 struct property_entry {
254 enum dev_prop_type type;
258 u8 u8_data[sizeof(u64) / sizeof(u8)];
259 u16 u16_data[sizeof(u64) / sizeof(u16)];
260 u32 u32_data[sizeof(u64) / sizeof(u32)];
261 u64 u64_data[sizeof(u64) / sizeof(u64)];
262 const char *str[sizeof(u64) / sizeof(char *)];
268 * Note: the below initializers for the anonymous union are carefully
269 * crafted to avoid gcc-4.4.4's problems with initialization of anon unions
273 #define __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_) \
274 sizeof(((struct property_entry *)NULL)->value._elem_[0])
276 #define __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, _elsize_, _Type_, \
278 (struct property_entry) { \
280 .length = (_len_) * (_elsize_), \
281 .type = DEV_PROP_##_Type_, \
282 { .pointer = _val_ }, \
285 #define __PROPERTY_ENTRY_ARRAY_LEN(_name_, _elem_, _Type_, _val_, _len_)\
286 __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \
287 __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \
288 _Type_, _val_, _len_)
290 #define PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, _len_) \
291 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u8_data, U8, _val_, _len_)
292 #define PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, _len_) \
293 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u16_data, U16, _val_, _len_)
294 #define PROPERTY_ENTRY_U32_ARRAY_LEN(_name_, _val_, _len_) \
295 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u32_data, U32, _val_, _len_)
296 #define PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, _len_) \
297 __PROPERTY_ENTRY_ARRAY_LEN(_name_, u64_data, U64, _val_, _len_)
298 #define PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, _len_) \
299 __PROPERTY_ENTRY_ARRAY_LEN(_name_, str, STRING, _val_, _len_)
300 #define PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, _len_) \
301 __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \
302 sizeof(struct software_node_ref_args), \
305 #define PROPERTY_ENTRY_U8_ARRAY(_name_, _val_) \
306 PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
307 #define PROPERTY_ENTRY_U16_ARRAY(_name_, _val_) \
308 PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
309 #define PROPERTY_ENTRY_U32_ARRAY(_name_, _val_) \
310 PROPERTY_ENTRY_U32_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
311 #define PROPERTY_ENTRY_U64_ARRAY(_name_, _val_) \
312 PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
313 #define PROPERTY_ENTRY_STRING_ARRAY(_name_, _val_) \
314 PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
315 #define PROPERTY_ENTRY_REF_ARRAY(_name_, _val_) \
316 PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
318 #define __PROPERTY_ENTRY_ELEMENT(_name_, _elem_, _Type_, _val_) \
319 (struct property_entry) { \
321 .length = __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \
323 .type = DEV_PROP_##_Type_, \
324 { .value = { ._elem_[0] = _val_ } }, \
327 #define PROPERTY_ENTRY_U8(_name_, _val_) \
328 __PROPERTY_ENTRY_ELEMENT(_name_, u8_data, U8, _val_)
329 #define PROPERTY_ENTRY_U16(_name_, _val_) \
330 __PROPERTY_ENTRY_ELEMENT(_name_, u16_data, U16, _val_)
331 #define PROPERTY_ENTRY_U32(_name_, _val_) \
332 __PROPERTY_ENTRY_ELEMENT(_name_, u32_data, U32, _val_)
333 #define PROPERTY_ENTRY_U64(_name_, _val_) \
334 __PROPERTY_ENTRY_ELEMENT(_name_, u64_data, U64, _val_)
335 #define PROPERTY_ENTRY_STRING(_name_, _val_) \
336 __PROPERTY_ENTRY_ELEMENT(_name_, str, STRING, _val_)
338 #define PROPERTY_ENTRY_BOOL(_name_) \
339 (struct property_entry) { \
344 #define PROPERTY_ENTRY_REF(_name_, _ref_, ...) \
345 (struct property_entry) { \
347 .length = sizeof(struct software_node_ref_args), \
348 .type = DEV_PROP_REF, \
349 { .pointer = &(const struct software_node_ref_args) { \
351 .nargs = ARRAY_SIZE(((u64[]){ 0, ##__VA_ARGS__ })) - 1, \
352 .args = { __VA_ARGS__ }, \
356 struct property_entry *
357 property_entries_dup(const struct property_entry *properties);
359 void property_entries_free(const struct property_entry *properties);
361 int device_add_properties(struct device *dev,
362 const struct property_entry *properties);
363 void device_remove_properties(struct device *dev);
365 bool device_dma_supported(struct device *dev);
367 enum dev_dma_attr device_get_dma_attr(struct device *dev);
369 const void *device_get_match_data(struct device *dev);
371 int device_get_phy_mode(struct device *dev);
373 void *device_get_mac_address(struct device *dev, char *addr, int alen);
375 int fwnode_get_phy_mode(struct fwnode_handle *fwnode);
376 void *fwnode_get_mac_address(struct fwnode_handle *fwnode,
377 char *addr, int alen);
378 struct fwnode_handle *fwnode_graph_get_next_endpoint(
379 const struct fwnode_handle *fwnode, struct fwnode_handle *prev);
380 struct fwnode_handle *
381 fwnode_graph_get_port_parent(const struct fwnode_handle *fwnode);
382 struct fwnode_handle *fwnode_graph_get_remote_port_parent(
383 const struct fwnode_handle *fwnode);
384 struct fwnode_handle *fwnode_graph_get_remote_port(
385 const struct fwnode_handle *fwnode);
386 struct fwnode_handle *fwnode_graph_get_remote_endpoint(
387 const struct fwnode_handle *fwnode);
388 struct fwnode_handle *
389 fwnode_graph_get_remote_node(const struct fwnode_handle *fwnode, u32 port,
393 * Fwnode lookup flags
395 * @FWNODE_GRAPH_ENDPOINT_NEXT: In the case of no exact match, look for the
396 * closest endpoint ID greater than the specified
398 * @FWNODE_GRAPH_DEVICE_DISABLED: That the device to which the remote
399 * endpoint of the given endpoint belongs to,
402 #define FWNODE_GRAPH_ENDPOINT_NEXT BIT(0)
403 #define FWNODE_GRAPH_DEVICE_DISABLED BIT(1)
405 struct fwnode_handle *
406 fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode,
407 u32 port, u32 endpoint, unsigned long flags);
409 #define fwnode_graph_for_each_endpoint(fwnode, child) \
411 (child = fwnode_graph_get_next_endpoint(fwnode, child)); )
413 int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
414 struct fwnode_endpoint *endpoint);
416 /* -------------------------------------------------------------------------- */
417 /* Software fwnode support - when HW description is incomplete or missing */
420 * struct software_node - Software node description
421 * @name: Name of the software node
422 * @parent: Parent of the software node
423 * @properties: Array of device properties
425 struct software_node {
427 const struct software_node *parent;
428 const struct property_entry *properties;
431 bool is_software_node(const struct fwnode_handle *fwnode);
432 const struct software_node *
433 to_software_node(const struct fwnode_handle *fwnode);
434 struct fwnode_handle *software_node_fwnode(const struct software_node *node);
436 const struct software_node *
437 software_node_find_by_name(const struct software_node *parent,
440 int software_node_register_nodes(const struct software_node *nodes);
441 void software_node_unregister_nodes(const struct software_node *nodes);
443 int software_node_register(const struct software_node *node);
445 int software_node_notify(struct device *dev, unsigned long action);
447 struct fwnode_handle *
448 fwnode_create_software_node(const struct property_entry *properties,
449 const struct fwnode_handle *parent);
450 void fwnode_remove_software_node(struct fwnode_handle *fwnode);
452 #endif /* _LINUX_PROPERTY_H_ */