1 /* 2 * OF graph binding parsing helpers 3 * 4 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd. 5 * Author: Sylwester Nawrocki <[email protected]> 6 * 7 * Copyright (C) 2012 Renesas Electronics Corp. 8 * Author: Guennadi Liakhovetski <[email protected]> 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 */ 96