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 /**
  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 #ifdef CONFIG_OF
  30 int of_graph_parse_endpoint(const struct device_node *node,
  31                                 struct of_endpoint *endpoint);
  32 struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
  33                                         struct device_node *previous);
  34 struct device_node *of_graph_get_remote_port_parent(
  35                                         const struct device_node *node);
  36 struct device_node *of_graph_get_remote_port(const struct device_node *node);
  37 #else
  38
  39 static inline int of_graph_parse_endpoint(const struct device_node *node,
  40                                         struct of_endpoint *endpoint)
  41 {
  42         return -ENOSYS;
  43 }
  44
  45 static inline struct device_node *of_graph_get_next_endpoint(
  46                                         const struct device_node *parent,
  47                                         struct device_node *previous)
  48 {
  49         return NULL;
  50 }
  51
  52 static inline struct device_node *of_graph_get_remote_port_parent(
  53                                         const struct device_node *node)
  54 {
  55         return NULL;
  56 }
  57
  58 static inline struct device_node *of_graph_get_remote_port(
  59                                         const struct device_node *node)
  60 {
  61         return NULL;
  62 }
  63
  64 #endif /* CONFIG_OF */
  65
  66 #endif /* __LINUX_OF_GRAPH_H */