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_endpoint_by_regs(
49 const struct device_node *parent, int port_reg, int reg);
50 struct device_node *of_graph_get_remote_port_parent(
51 const struct device_node *node);
52 struct device_node *of_graph_get_remote_port(const struct device_node *node);
53 #else
54
of_graph_parse_endpoint(const struct device_node * node,struct of_endpoint * endpoint)55 static inline int of_graph_parse_endpoint(const struct device_node *node,
56 struct of_endpoint *endpoint)
57 {
58 return -ENOSYS;
59 }
60
of_graph_get_port_by_id(struct device_node * node,u32 id)61 static inline struct device_node *of_graph_get_port_by_id(
62 struct device_node *node, u32 id)
63 {
64 return NULL;
65 }
66
of_graph_get_next_endpoint(const struct device_node * parent,struct device_node * previous)67 static inline struct device_node *of_graph_get_next_endpoint(
68 const struct device_node *parent,
69 struct device_node *previous)
70 {
71 return NULL;
72 }
73
of_graph_get_endpoint_by_regs(const struct device_node * parent,int port_reg,int reg)74 static inline struct device_node *of_graph_get_endpoint_by_regs(
75 const struct device_node *parent, int port_reg, int reg)
76 {
77 return NULL;
78 }
79
of_graph_get_remote_port_parent(const struct device_node * node)80 static inline struct device_node *of_graph_get_remote_port_parent(
81 const struct device_node *node)
82 {
83 return NULL;
84 }
85
of_graph_get_remote_port(const struct device_node * node)86 static inline struct device_node *of_graph_get_remote_port(
87 const struct device_node *node)
88 {
89 return NULL;
90 }
91
92 #endif /* CONFIG_OF */
93
94 #endif /* __LINUX_OF_GRAPH_H */
95