1 /*
2 * OF graph binding parsing helpers
3 *
4 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
5 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
6 *
7 * Copyright (C) 2012 Renesas Electronics Corp.
8 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of version 2 of the GNU General Public License as
12 * published by the Free Software Foundation.
13 */
14 #ifndef __LINUX_OF_GRAPH_H
15 #define __LINUX_OF_GRAPH_H
16
17 #include <linux/types.h>
18
19 /**
20 * struct of_endpoint - the OF graph endpoint data structure
21 * @port: identifier (value of reg property) of a port this endpoint belongs to
22 * @id: identifier (value of reg property) of this endpoint
23 * @local_node: pointer to device_node of this endpoint
24 */
25 struct of_endpoint {
26 unsigned int port;
27 unsigned int id;
28 const struct device_node *local_node;
29 };
30
31 /**
32 * for_each_endpoint_of_node - iterate over every endpoint in a device node
33 * @parent: parent device node containing ports and endpoints
34 * @child: loop variable pointing to the current endpoint node
35 *
36 * When breaking out of the loop, of_node_put(child) has to be called manually.
37 */
38 #define for_each_endpoint_of_node(parent, child) \
39 for (child = of_graph_get_next_endpoint(parent, NULL); child != NULL; \
40 child = of_graph_get_next_endpoint(parent, child))
41
42 #ifdef CONFIG_OF
43 int of_graph_parse_endpoint(const struct device_node *node,
44 struct of_endpoint *endpoint);
45 struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id);
46 struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
47 struct device_node *previous);
48 struct device_node *of_graph_get_remote_port_parent(
49 const struct device_node *node);
50 struct device_node *of_graph_get_remote_port(const struct device_node *node);
51 #else
52
of_graph_parse_endpoint(const struct device_node * node,struct of_endpoint * endpoint)53 static inline int of_graph_parse_endpoint(const struct device_node *node,
54 struct of_endpoint *endpoint)
55 {
56 return -ENOSYS;
57 }
58
of_graph_get_port_by_id(struct device_node * node,u32 id)59 static inline struct device_node *of_graph_get_port_by_id(
60 struct device_node *node, u32 id)
61 {
62 return NULL;
63 }
64
of_graph_get_next_endpoint(const struct device_node * parent,struct device_node * previous)65 static inline struct device_node *of_graph_get_next_endpoint(
66 const struct device_node *parent,
67 struct device_node *previous)
68 {
69 return NULL;
70 }
71
of_graph_get_remote_port_parent(const struct device_node * node)72 static inline struct device_node *of_graph_get_remote_port_parent(
73 const struct device_node *node)
74 {
75 return NULL;
76 }
77
of_graph_get_remote_port(const struct device_node * node)78 static inline struct device_node *of_graph_get_remote_port(
79 const struct device_node *node)
80 {
81 return NULL;
82 }
83
84 #endif /* CONFIG_OF */
85
86 #endif /* __LINUX_OF_GRAPH_H */
87