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
  19 /**
  20  * struct of_endpoint - the OF graph endpoint data structure
  21  * @port: identifier (value of reg property) of a port this endpoint belongs to
  22  * @id: identifier (value of reg property) of this endpoint
  23  * @local_node: pointer to device_node of this endpoint
  24  */
  25 struct of_endpoint {
  26         unsigned int port;
  27         unsigned int id;
  28         const struct device_node *local_node;
  29 };
  30
  31 /**
  32  * for_each_endpoint_of_node - iterate over every endpoint in a device node
  33  * @parent: parent device node containing ports and endpoints
  34  * @child: loop variable pointing to the current endpoint node
  35  *
  36  * When breaking out of the loop, of_node_put(child) has to be called manually.
  37  */
  38 #define for_each_endpoint_of_node(parent, child) \
  39         for (child = of_graph_get_next_endpoint(parent, NULL); child != NULL; \
  40              child = of_graph_get_next_endpoint(parent, child))
  41
  42 #ifdef CONFIG_OF
  43 int of_graph_parse_endpoint(const struct device_node *node,
  44                                 struct of_endpoint *endpoint);
  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_port_parent(
  51                                         const struct device_node *node);
  52 struct device_node *of_graph_get_remote_port(const struct device_node *node);
  53 #else
  54
  55 static inline int of_graph_parse_endpoint(const struct device_node *node,
  56                                         struct of_endpoint *endpoint)
  57 {
  58         return -ENOSYS;
  59 }
  60
  61 static inline struct device_node *of_graph_get_port_by_id(
  62                                         struct device_node *node, u32 id)
  63 {
  64         return NULL;
  65 }
  66
  67 static inline struct device_node *of_graph_get_next_endpoint(
  68                                         const struct device_node *parent,
  69                                         struct device_node *previous)
  70 {
  71         return NULL;
  72 }
  73
  74 static inline struct device_node *of_graph_get_endpoint_by_regs(
  75                 const struct device_node *parent, int port_reg, int reg)
  76 {
  77         return NULL;
  78 }
  79
  80 static inline struct device_node *of_graph_get_remote_port_parent(
  81                                         const struct device_node *node)
  82 {
  83         return NULL;
  84 }
  85
  86 static inline struct device_node *of_graph_get_remote_port(
  87                                         const struct device_node *node)
  88 {
  89         return NULL;
  90 }
  91
  92 #endif /* CONFIG_OF */
  93
  94 #endif /* __LINUX_OF_GRAPH_H */