2 * Function to read values from the device tree node attached to a udevice.
4 * Copyright (c) 2017 Google, Inc
5 * Written by Simon Glass <sjg@chromium.org>
7 * SPDX-License-Identifier: GPL-2.0+
13 #include <dm/fdtaddr.h>
14 #include <dm/ofnode.h>
15 #include <dm/uclass.h>
19 #if CONFIG_IS_ENABLED(OF_LIVE)
20 static inline const struct device_node *dev_np(struct udevice *dev)
22 return ofnode_to_np(dev->node);
25 static inline const struct device_node *dev_np(struct udevice *dev)
32 * dev_ofnode() - get the DT node reference associated with a udevice
34 * @dev: device to check
35 * @return reference of the the device's DT node
37 static inline ofnode dev_ofnode(struct udevice *dev)
42 static inline bool dev_of_valid(struct udevice *dev)
44 return ofnode_valid(dev_ofnode(dev));
48 * dev_read_resource() - obtain an indexed resource from a device.
50 * @dev: devuce to examine
51 * @index index of the resource to retrieve (0 = first)
52 * @res returns the resource
53 * @return 0 if ok, negative on error
55 int dev_read_resource(struct udevice *dev, uint index, struct resource *res);
57 #ifndef CONFIG_DM_DEV_READ_INLINE
59 * dev_read_u32_default() - read a 32-bit integer from a device's DT property
61 * @dev: device to read DT property from
62 * @propname: name of the property to read from
63 * @def: default value to return if the property has no value
64 * @return property value, or @def if not found
66 int dev_read_u32_default(struct udevice *dev, const char *propname, int def);
69 * dev_read_string() - Read a string from a device's DT property
71 * @dev: device to read DT property from
72 * @propname: name of the property to read
73 * @return string from property value, or NULL if there is no such property
75 const char *dev_read_string(struct udevice *dev, const char *propname);
78 * dev_read_bool() - read a boolean value from a device's DT property
80 * @dev: device to read DT property from
81 * @propname: name of property to read
82 * @return true if property is present (meaning true), false if not present
84 bool dev_read_bool(struct udevice *dev, const char *propname);
87 * dev_read_subnode() - find a named subnode of a device
89 * @dev: device whose DT node contains the subnode
90 * @subnode_name: name of subnode to find
91 * @return reference to subnode (which can be invalid if there is no such
94 ofnode dev_read_subnode(struct udevice *dev, const char *subbnode_name);
97 * dev_read_size() - read the size of a property
99 * @dev: device to check
100 * @propname: property to check
101 * @return size of property if present, or -EINVAL if not
103 int dev_read_size(struct udevice *dev, const char *propname);
106 * dev_read_addr_index() - Get the indexed reg property of a device
108 * @dev: Device to read from
109 * @index: the 'reg' property can hold a list of <addr, size> pairs
110 * and @index is used to select which one is required
112 * @return address or FDT_ADDR_T_NONE if not found
114 fdt_addr_t dev_read_addr_index(struct udevice *dev, int index);
117 * dev_read_addr() - Get the reg property of a device
119 * @dev: Device to read from
121 * @return address or FDT_ADDR_T_NONE if not found
123 fdt_addr_t dev_read_addr(struct udevice *dev);
126 * dev_read_addr_size() - get address and size from a device property
128 * This does no address translation. It simply reads an property that contains
129 * an address and a size value, one after the other.
131 * @dev: Device to read from
132 * @propname: property to read
133 * @sizep: place to put size value (on success)
134 * @return address value, or FDT_ADDR_T_NONE on error
136 fdt_addr_t dev_read_addr_size(struct udevice *dev, const char *propname,
140 * dev_read_name() - get the name of a device's node
142 * @node: valid node to look up
143 * @return name of node
145 const char *dev_read_name(struct udevice *dev);
148 * dev_read_stringlist_search() - find string in a string list and return index
150 * Note that it is possible for this function to succeed on property values
151 * that are not NUL-terminated. That's because the function will stop after
152 * finding the first occurrence of @string. This can for example happen with
153 * small-valued cell properties, such as #address-cells, when searching for
156 * @dev: device to check
157 * @propname: name of the property containing the string list
158 * @string: string to look up in the string list
161 * the index of the string in the list of strings
162 * -ENODATA if the property is not found
163 * -EINVAL on some other error
165 int dev_read_stringlist_search(struct udevice *dev, const char *property,
169 * dev_read_phandle_with_args() - Find a node pointed by phandle in a list
171 * This function is useful to parse lists of phandles and their arguments.
172 * Returns 0 on success and fills out_args, on error returns appropriate
175 * Caller is responsible to call of_node_put() on the returned out_args->np
189 * list = <&phandle1 1 2 &phandle2 3>;
192 * To get a device_node of the `node2' node you may call this:
193 * dev_read_phandle_with_args(dev, "list", "#list-cells", 0, 1, &args);
195 * @dev: device whose node containing a list
196 * @list_name: property name that contains a list
197 * @cells_name: property name that specifies phandles' arguments count
198 * @cells_count: Cell count to use if @cells_name is NULL
199 * @index: index of a phandle to parse out
200 * @out_args: optional pointer to output arguments structure (will be filled)
201 * @return 0 on success (with @out_args filled out if not NULL), -ENOENT if
202 * @list_name does not exist, -EINVAL if a phandle was not found,
203 * @cells_name could not be found, the arguments were truncated or there
204 * were too many arguments.
206 int dev_read_phandle_with_args(struct udevice *dev, const char *list_name,
207 const char *cells_name, int cell_count,
209 struct ofnode_phandle_args *out_args);
212 * dev_read_addr_cells() - Get the number of address cells for a device's node
214 * This walks back up the tree to find the closest #address-cells property
215 * which controls the given node.
217 * @dev: devioe to check
218 * @return number of address cells this node uses
220 int dev_read_addr_cells(struct udevice *dev);
223 * dev_read_size_cells() - Get the number of size cells for a device's node
225 * This walks back up the tree to find the closest #size-cells property
226 * which controls the given node.
228 * @dev: devioe to check
229 * @return number of size cells this node uses
231 int dev_read_size_cells(struct udevice *dev);
234 * dev_read_phandle() - Get the phandle from a device
236 * @dev: device to check
237 * @return phandle (1 or greater), or 0 if no phandle or other error
239 int dev_read_phandle(struct udevice *dev);
242 * dev_read_prop()- - read a property from a device's node
244 * @dev: device to check
245 * @propname: property to read
246 * @lenp: place to put length on success
247 * @return pointer to property, or NULL if not found
249 const u32 *dev_read_prop(struct udevice *dev, const char *propname, int *lenp);
252 * dev_read_alias_seq() - Get the alias sequence number of a node
254 * This works out whether a node is pointed to by an alias, and if so, the
255 * sequence number of that alias. Aliases are of the form <base><num> where
256 * <num> is the sequence number. For example spi2 would be sequence number 2.
258 * @dev: device to look up
259 * @devnump: set to the sequence number if one is found
260 * @return 0 if a sequence was found, -ve if not
262 int dev_read_alias_seq(struct udevice *dev, int *devnump);
265 * dev_read_u32_array() - Find and read an array of 32 bit integers
267 * Search for a property in a device node and read 32-bit value(s) from
270 * The out_values is modified only if a valid u32 value can be decoded.
272 * @dev: device to look up
273 * @propname: name of the property to read
274 * @out_values: pointer to return value, modified only if return value is 0
275 * @sz: number of array elements to read
276 * @return 0 on success, -EINVAL if the property does not exist, -ENODATA if
277 * property does not have a value, and -EOVERFLOW if the property data isn't
280 int dev_read_u32_array(struct udevice *dev, const char *propname,
281 u32 *out_values, size_t sz);
284 * dev_read_first_subnode() - find the first subnode of a device's node
286 * @dev: device to look up
287 * @return reference to the first subnode (which can be invalid if the device's
288 * node has no subnodes)
290 ofnode dev_read_first_subnode(struct udevice *dev);
293 * ofnode_next_subnode() - find the next sibling of a subnode
295 * @node: valid reference to previous node (sibling)
296 * @return reference to the next subnode (which can be invalid if the node
297 * has no more siblings)
299 ofnode dev_read_next_subnode(ofnode node);
302 * dev_read_u8_array_ptr() - find an 8-bit array
304 * Look up a device's node property and return a pointer to its contents as a
305 * byte array of given length. The property must have at least enough data
306 * for the array (count bytes). It may have more, but this will be ignored.
307 * The data is not copied.
309 * @dev: device to look up
310 * @propname: name of property to find
311 * @sz: number of array elements
312 * @return pointer to byte array if found, or NULL if the property is not
313 * found or there is not enough data
315 const uint8_t *dev_read_u8_array_ptr(struct udevice *dev, const char *propname,
319 * dev_read_enabled() - check whether a node is enabled
321 * This looks for a 'status' property. If this exists, then returns 1 if
322 * the status is 'ok' and 0 otherwise. If there is no status property,
323 * it returns 1 on the assumption that anything mentioned should be enabled
326 * @dev: device to examine
327 * @return integer value 0 (not enabled) or 1 (enabled)
329 int dev_read_enabled(struct udevice *dev);
331 #else /* CONFIG_DM_DEV_READ_INLINE is enabled */
333 static inline int dev_read_u32_default(struct udevice *dev,
334 const char *propname, int def)
336 return ofnode_read_u32_default(dev_ofnode(dev), propname, def);
339 static inline const char *dev_read_string(struct udevice *dev,
340 const char *propname)
342 return ofnode_read_string(dev_ofnode(dev), propname);
345 static inline bool dev_read_bool(struct udevice *dev, const char *propname)
347 return ofnode_read_bool(dev_ofnode(dev), propname);
350 static inline ofnode dev_read_subnode(struct udevice *dev,
351 const char *subbnode_name)
353 return ofnode_find_subnode(dev_ofnode(dev), subbnode_name);
356 static inline int dev_read_size(struct udevice *dev, const char *propname)
358 return ofnode_read_size(dev_ofnode(dev), propname);
361 static inline fdt_addr_t dev_read_addr_index(struct udevice *dev, int index)
363 return devfdt_get_addr_index(dev, index);
366 static inline fdt_addr_t dev_read_addr(struct udevice *dev)
368 return devfdt_get_addr(dev);
371 static inline fdt_addr_t dev_read_addr_size(struct udevice *dev,
372 const char *propname,
375 return ofnode_get_addr_size(dev_ofnode(dev), propname, sizep);
378 static inline const char *dev_read_name(struct udevice *dev)
380 return ofnode_get_name(dev_ofnode(dev));
383 static inline int dev_read_stringlist_search(struct udevice *dev,
384 const char *propname,
387 return ofnode_stringlist_search(dev_ofnode(dev), propname, string);
390 static inline int dev_read_phandle_with_args(struct udevice *dev,
391 const char *list_name, const char *cells_name, int cell_count,
392 int index, struct ofnode_phandle_args *out_args)
394 return ofnode_parse_phandle_with_args(dev_ofnode(dev), list_name,
395 cells_name, cell_count, index,
399 static inline int dev_read_addr_cells(struct udevice *dev)
401 return fdt_address_cells(gd->fdt_blob, dev_of_offset(dev));
404 static inline int dev_read_size_cells(struct udevice *dev)
406 return fdt_size_cells(gd->fdt_blob, dev_of_offset(dev));
409 static inline int dev_read_phandle(struct udevice *dev)
411 return fdt_get_phandle(gd->fdt_blob, dev_of_offset(dev));
414 static inline const u32 *dev_read_prop(struct udevice *dev,
415 const char *propname, int *lenp)
417 return ofnode_read_prop(dev_ofnode(dev), propname, lenp);
420 static inline int dev_read_alias_seq(struct udevice *dev, int *devnump)
422 return fdtdec_get_alias_seq(gd->fdt_blob, dev->uclass->uc_drv->name,
423 dev_of_offset(dev), devnump);
426 static inline int dev_read_u32_array(struct udevice *dev, const char *propname,
427 u32 *out_values, size_t sz)
429 return ofnode_read_u32_array(dev_ofnode(dev), propname, out_values, sz);
432 static inline ofnode dev_read_first_subnode(struct udevice *dev)
434 return ofnode_first_subnode(dev_ofnode(dev));
437 static inline ofnode dev_read_next_subnode(ofnode node)
439 return ofnode_next_subnode(node);
442 static inline const uint8_t *dev_read_u8_array_ptr(struct udevice *dev,
443 const char *propname, size_t sz)
445 return ofnode_read_u8_array_ptr(dev_ofnode(dev), propname, sz);
448 static inline int dev_read_enabled(struct udevice *dev)
450 return fdtdec_get_is_enabled(gd->fdt_blob, dev_of_offset(dev));
453 #endif /* CONFIG_DM_DEV_READ_INLINE */
456 * dev_for_each_subnode() - Helper function to iterate through subnodes
458 * This creates a for() loop which works through the subnodes in a device's
461 * @subnode: ofnode holding the current subnode
462 * @dev: device to use for interation (struct udevice *)
464 #define dev_for_each_subnode(subnode, dev) \
465 for (subnode = dev_read_first_subnode(dev); \
466 ofnode_valid(subnode); \
467 subnode = ofnode_next_subnode(subnode))