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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#include <linux/errno.h>
19
20/**
21 * struct of_endpoint - the OF graph endpoint data structure
22 * @port: identifier (value of reg property) of a port this endpoint belongs to
23 * @id: identifier (value of reg property) of this endpoint
24 * @local_node: pointer to device_node of this endpoint
25 */
26struct of_endpoint {
27 unsigned int port;
28 unsigned int id;
29 const struct device_node *local_node;
30};
31
32/**
33 * for_each_endpoint_of_node - iterate over every endpoint in a device node
34 * @parent: parent device node containing ports and endpoints
35 * @child: loop variable pointing to the current endpoint node
36 *
37 * When breaking out of the loop, of_node_put(child) has to be called manually.
38 */
39#define for_each_endpoint_of_node(parent, child) \
40 for (child = of_graph_get_next_endpoint(parent, NULL); child != NULL; \
41 child = of_graph_get_next_endpoint(parent, child))
42
43#ifdef CONFIG_OF
44int of_graph_parse_endpoint(const struct device_node *node,
45 struct of_endpoint *endpoint);
46int of_graph_get_endpoint_count(const struct device_node *np);
47struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id);
48struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
49 struct device_node *previous);
50struct device_node *of_graph_get_endpoint_by_regs(
51 const struct device_node *parent, int port_reg, int reg);
52struct device_node *of_graph_get_remote_endpoint(
53 const struct device_node *node);
54struct device_node *of_graph_get_port_parent(struct device_node *node);
55struct device_node *of_graph_get_remote_port_parent(
56 const struct device_node *node);
57struct device_node *of_graph_get_remote_port(const struct device_node *node);
58struct device_node *of_graph_get_remote_node(const struct device_node *node,
59 u32 port, u32 endpoint);
60#else
61
62static inline int of_graph_parse_endpoint(const struct device_node *node,
63 struct of_endpoint *endpoint)
64{
65 return -ENOSYS;
66}
67
68static inline int of_graph_get_endpoint_count(const struct device_node *np)
69{
70 return 0;
71}
72
73static inline struct device_node *of_graph_get_port_by_id(
74 struct device_node *node, u32 id)
75{
76 return NULL;
77}
78
79static inline struct device_node *of_graph_get_next_endpoint(
80 const struct device_node *parent,
81 struct device_node *previous)
82{
83 return NULL;
84}
85
86static inline struct device_node *of_graph_get_endpoint_by_regs(
87 const struct device_node *parent, int port_reg, int reg)
88{
89 return NULL;
90}
91
92static inline struct device_node *of_graph_get_remote_endpoint(
93 const struct device_node *node)
94{
95 return NULL;
96}
97
98static inline struct device_node *of_graph_get_port_parent(
99 struct device_node *node)
100{
101 return NULL;
102}
103
104static inline struct device_node *of_graph_get_remote_port_parent(
105 const struct device_node *node)
106{
107 return NULL;
108}
109
110static inline struct device_node *of_graph_get_remote_port(
111 const struct device_node *node)
112{
113 return NULL;
114}
115static inline struct device_node *of_graph_get_remote_node(
116 const struct device_node *node,
117 u32 port, u32 endpoint)
118{
119 return NULL;
120}
121
122#endif /* CONFIG_OF */
123
124#endif /* __LINUX_OF_GRAPH_H */