1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * OF graph binding parsing helpers
4 *
5 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
6 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
7 *
8 * Copyright (C) 2012 Renesas Electronics Corp.
9 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
10 */
11 #ifndef __LINUX_OF_GRAPH_H
12 #define __LINUX_OF_GRAPH_H
13
14 #include <linux/types.h>
15 #include <linux/errno.h>
16
17 /**
18 * struct of_endpoint - the OF graph endpoint data structure
19 * @port: identifier (value of reg property) of a port this endpoint belongs to
20 * @id: identifier (value of reg property) of this endpoint
21 * @local_node: pointer to device_node of this endpoint
22 */
23 struct of_endpoint {
24 unsigned int port;
25 unsigned int id;
26 const struct device_node *local_node;
27 };
28
29 /**
30 * for_each_endpoint_of_node - iterate over every endpoint in a device node
31 * @parent: parent device node containing ports and endpoints
32 * @child: loop variable pointing to the current endpoint node
33 *
34 * When breaking out of the loop, of_node_put(child) has to be called manually.
35 */
36 #define for_each_endpoint_of_node(parent, child) \
37 for (child = of_graph_get_next_endpoint(parent, NULL); child != NULL; \
38 child = of_graph_get_next_endpoint(parent, child))
39
40 #ifdef CONFIG_OF
41 bool of_graph_is_present(const struct device_node *node);
42 int of_graph_parse_endpoint(const struct device_node *node,
43 struct of_endpoint *endpoint);
44 unsigned int of_graph_get_endpoint_count(const struct device_node *np);
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_endpoint(
51 const struct device_node *node);
52 struct device_node *of_graph_get_port_parent(struct device_node *node);
53 struct device_node *of_graph_get_remote_port_parent(
54 const struct device_node *node);
55 struct device_node *of_graph_get_remote_port(const struct device_node *node);
56 struct device_node *of_graph_get_remote_node(const struct device_node *node,
57 u32 port, u32 endpoint);
58 #else
59
60 static inline bool of_graph_is_present(const struct device_node *node)
61 {
62 return false;
63 }
64
65 static inline int of_graph_parse_endpoint(const struct device_node *node,
66 struct of_endpoint *endpoint)
67 {
68 return -ENOSYS;
69 }
70
71 static inline unsigned int of_graph_get_endpoint_count(const struct device_node *np)
72 {
73 return 0;
74 }
75
76 static inline struct device_node *of_graph_get_port_by_id(
77 struct device_node *node, u32 id)
78 {
79 return NULL;
80 }
81
82 static inline struct device_node *of_graph_get_next_endpoint(
83 const struct device_node *parent,
84 struct device_node *previous)
85 {
86 return NULL;
87 }
88
89 static inline struct device_node *of_graph_get_endpoint_by_regs(
90 const struct device_node *parent, int port_reg, int reg)
91 {
92 return NULL;
93 }
94
95 static inline struct device_node *of_graph_get_remote_endpoint(
96 const struct device_node *node)
97 {
98 return NULL;
99 }
100
101 static inline struct device_node *of_graph_get_port_parent(
102 struct device_node *node)
103 {
104 return NULL;
105 }
106
107 static inline struct device_node *of_graph_get_remote_port_parent(
108 const struct device_node *node)
109 {
110 return NULL;
111 }
112
113 static inline struct device_node *of_graph_get_remote_port(
114 const struct device_node *node)
115 {
116 return NULL;
117 }
118 static inline struct device_node *of_graph_get_remote_node(
119 const struct device_node *node,
120 u32 port, u32 endpoint)
121 {
122 return NULL;
123 }
124
125 #endif /* CONFIG_OF */
126
127 #endif /* __LINUX_OF_GRAPH_H */
128
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