1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * fwnode.h - Firmware device node object handle type definition.
5 * Copyright (C) 2015, Intel Corporation
6 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
9 #ifndef _LINUX_FWNODE_H_
10 #define _LINUX_FWNODE_H_
12 #include <linux/types.h>
13 #include <linux/list.h>
15 struct fwnode_operations;
21 * LINKS_ADDED: The fwnode has already be parsed to add fwnode links.
23 #define FWNODE_FLAG_LINKS_ADDED BIT(0)
25 struct fwnode_handle {
26 struct fwnode_handle *secondary;
27 const struct fwnode_operations *ops;
29 struct list_head suppliers;
30 struct list_head consumers;
35 struct fwnode_handle *supplier;
36 struct list_head s_hook;
37 struct fwnode_handle *consumer;
38 struct list_head c_hook;
42 * struct fwnode_endpoint - Fwnode graph endpoint
45 * @local_fwnode: reference to the related fwnode
47 struct fwnode_endpoint {
50 const struct fwnode_handle *local_fwnode;
53 #define NR_FWNODE_REFERENCE_ARGS 8
56 * struct fwnode_reference_args - Fwnode reference with additional arguments
57 * @fwnode:- A reference to the base fwnode
58 * @nargs: Number of elements in @args array
59 * @args: Integer arguments on the fwnode
61 struct fwnode_reference_args {
62 struct fwnode_handle *fwnode;
64 u64 args[NR_FWNODE_REFERENCE_ARGS];
68 * struct fwnode_operations - Operations for fwnode interface
69 * @get: Get a reference to an fwnode.
70 * @put: Put a reference to an fwnode.
71 * @device_is_available: Return true if the device is available.
72 * @device_get_match_data: Return the device driver match data.
73 * @property_present: Return true if a property is present.
74 * @property_read_int_array: Read an array of integer properties. Return zero on
75 * success, a negative error code otherwise.
76 * @property_read_string_array: Read an array of string properties. Return zero
77 * on success, a negative error code otherwise.
78 * @get_name: Return the name of an fwnode.
79 * @get_name_prefix: Get a prefix for a node (for printing purposes).
80 * @get_parent: Return the parent of an fwnode.
81 * @get_next_child_node: Return the next child node in an iteration.
82 * @get_named_child_node: Return a child node with a given name.
83 * @get_reference_args: Return a reference pointed to by a property, with args
84 * @graph_get_next_endpoint: Return an endpoint node in an iteration.
85 * @graph_get_remote_endpoint: Return the remote endpoint node of a local
87 * @graph_get_port_parent: Return the parent node of a port node.
88 * @graph_parse_endpoint: Parse endpoint for port and endpoint id.
89 * @add_links: Create fwnode links to all the suppliers of the fwnode. Return
90 * zero on success, a negative error code otherwise.
92 struct fwnode_operations {
93 struct fwnode_handle *(*get)(struct fwnode_handle *fwnode);
94 void (*put)(struct fwnode_handle *fwnode);
95 bool (*device_is_available)(const struct fwnode_handle *fwnode);
96 const void *(*device_get_match_data)(const struct fwnode_handle *fwnode,
97 const struct device *dev);
98 bool (*property_present)(const struct fwnode_handle *fwnode,
99 const char *propname);
100 int (*property_read_int_array)(const struct fwnode_handle *fwnode,
101 const char *propname,
102 unsigned int elem_size, void *val,
105 (*property_read_string_array)(const struct fwnode_handle *fwnode_handle,
106 const char *propname, const char **val,
108 const char *(*get_name)(const struct fwnode_handle *fwnode);
109 const char *(*get_name_prefix)(const struct fwnode_handle *fwnode);
110 struct fwnode_handle *(*get_parent)(const struct fwnode_handle *fwnode);
111 struct fwnode_handle *
112 (*get_next_child_node)(const struct fwnode_handle *fwnode,
113 struct fwnode_handle *child);
114 struct fwnode_handle *
115 (*get_named_child_node)(const struct fwnode_handle *fwnode,
117 int (*get_reference_args)(const struct fwnode_handle *fwnode,
118 const char *prop, const char *nargs_prop,
119 unsigned int nargs, unsigned int index,
120 struct fwnode_reference_args *args);
121 struct fwnode_handle *
122 (*graph_get_next_endpoint)(const struct fwnode_handle *fwnode,
123 struct fwnode_handle *prev);
124 struct fwnode_handle *
125 (*graph_get_remote_endpoint)(const struct fwnode_handle *fwnode);
126 struct fwnode_handle *
127 (*graph_get_port_parent)(struct fwnode_handle *fwnode);
128 int (*graph_parse_endpoint)(const struct fwnode_handle *fwnode,
129 struct fwnode_endpoint *endpoint);
130 int (*add_links)(struct fwnode_handle *fwnode);
133 #define fwnode_has_op(fwnode, op) \
134 ((fwnode) && (fwnode)->ops && (fwnode)->ops->op)
135 #define fwnode_call_int_op(fwnode, op, ...) \
136 (fwnode ? (fwnode_has_op(fwnode, op) ? \
137 (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : -ENXIO) : \
140 #define fwnode_call_bool_op(fwnode, op, ...) \
141 (fwnode_has_op(fwnode, op) ? \
142 (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : false)
144 #define fwnode_call_ptr_op(fwnode, op, ...) \
145 (fwnode_has_op(fwnode, op) ? \
146 (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : NULL)
147 #define fwnode_call_void_op(fwnode, op, ...) \
149 if (fwnode_has_op(fwnode, op)) \
150 (fwnode)->ops->op(fwnode, ## __VA_ARGS__); \
152 #define get_dev_from_fwnode(fwnode) get_device((fwnode)->dev)
154 static inline void fwnode_init(struct fwnode_handle *fwnode,
155 const struct fwnode_operations *ops)
158 INIT_LIST_HEAD(&fwnode->consumers);
159 INIT_LIST_HEAD(&fwnode->suppliers);
162 extern u32 fw_devlink_get_flags(void);
163 int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup);
164 void fwnode_links_purge(struct fwnode_handle *fwnode);