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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
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 */
25struct 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
43int of_graph_parse_endpoint(const struct device_node *node,
44 struct of_endpoint *endpoint);
45struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id);
46struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
47 struct device_node *previous);
48struct device_node *of_graph_get_endpoint_by_regs(
49 const struct device_node *parent, int port_reg, int reg);
50struct device_node *of_graph_get_remote_port_parent(
51 const struct device_node *node);
52struct device_node *of_graph_get_remote_port(const struct device_node *node);
53#else
54
55static inline int of_graph_parse_endpoint(const struct device_node *node,
56 struct of_endpoint *endpoint)
57{
58 return -ENOSYS;
59}
60
61static inline struct device_node *of_graph_get_port_by_id(
62 struct device_node *node, u32 id)
63{
64 return NULL;
65}
66
67static 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
74static 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
80static inline struct device_node *of_graph_get_remote_port_parent(
81 const struct device_node *node)
82{
83 return NULL;
84}
85
86static 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 */