include/linux/of_graph.h

   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 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 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 */