include/linux/of_graph.h

   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  */
  26 struct 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
  44 int of_graph_parse_endpoint(const struct device_node *node,
  45                                 struct of_endpoint *endpoint);
  46 struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id);
  47 struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
  48                                         struct device_node *previous);
  49 struct device_node *of_graph_get_endpoint_by_regs(
  50                 const struct device_node *parent, int port_reg, int reg);
  51 struct device_node *of_graph_get_remote_port_parent(
  52                                         const struct device_node *node);
  53 struct device_node *of_graph_get_remote_port(const struct device_node *node);
  54 #else
  55
  56 static inline int of_graph_parse_endpoint(const struct device_node *node,
  57                                         struct of_endpoint *endpoint)
  58 {
  59         return -ENOSYS;
  60 }
  61
  62 static inline struct device_node *of_graph_get_port_by_id(
  63                                         struct device_node *node, u32 id)
  64 {
  65         return NULL;
  66 }
  67
  68 static inline struct device_node *of_graph_get_next_endpoint(
  69                                         const struct device_node *parent,
  70                                         struct device_node *previous)
  71 {
  72         return NULL;
  73 }
  74
  75 static inline struct device_node *of_graph_get_endpoint_by_regs(
  76                 const struct device_node *parent, int port_reg, int reg)
  77 {
  78         return NULL;
  79 }
  80
  81 static inline struct device_node *of_graph_get_remote_port_parent(
  82                                         const struct device_node *node)
  83 {
  84         return NULL;
  85 }
  86
  87 static inline struct device_node *of_graph_get_remote_port(
  88                                         const struct device_node *node)
  89 {
  90         return NULL;
  91 }
  92
  93 #endif /* CONFIG_OF */
  94
  95 #endif /* __LINUX_OF_GRAPH_H */