1 /* SPDX-License-Identifier: GPL-2.0 */
3 * OF graph binding parsing helpers
5 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
6 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
8 * Copyright (C) 2012 Renesas Electronics Corp.
9 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
11 #ifndef __LINUX_OF_GRAPH_H
12 #define __LINUX_OF_GRAPH_H
14 #include <linux/types.h>
15 #include <linux/errno.h>
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
26 const struct device_node *local_node;
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
34 * When breaking out of the loop, of_node_put(child) has to be called manually.
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))
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 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);
60 static inline bool of_graph_is_present(const struct device_node *node)
65 static inline int of_graph_parse_endpoint(const struct device_node *node,
66 struct of_endpoint *endpoint)
71 static inline int of_graph_get_endpoint_count(const struct device_node *np)
76 static inline struct device_node *of_graph_get_port_by_id(
77 struct device_node *node, u32 id)
82 static inline struct device_node *of_graph_get_next_endpoint(
83 const struct device_node *parent,
84 struct device_node *previous)
89 static inline struct device_node *of_graph_get_endpoint_by_regs(
90 const struct device_node *parent, int port_reg, int reg)
95 static inline struct device_node *of_graph_get_remote_endpoint(
96 const struct device_node *node)
101 static inline struct device_node *of_graph_get_port_parent(
102 struct device_node *node)
107 static inline struct device_node *of_graph_get_remote_port_parent(
108 const struct device_node *node)
113 static inline struct device_node *of_graph_get_remote_port(
114 const struct device_node *node)
118 static inline struct device_node *of_graph_get_remote_node(
119 const struct device_node *node,
120 u32 port, u32 endpoint)
125 #endif /* CONFIG_OF */
127 #endif /* __LINUX_OF_GRAPH_H */