diff options
| -rw-r--r-- | drivers/of/base.c | 37 | ||||
| -rw-r--r-- | include/linux/of_graph.h | 8 |
2 files changed, 45 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index ce8206f9f97a..8f2a1dbfe75c 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -2472,3 +2472,40 @@ struct device_node *of_graph_get_remote_port(const struct device_node *node) return of_get_next_parent(np); } EXPORT_SYMBOL(of_graph_get_remote_port); + +/** + * of_graph_get_remote_node() - get remote parent device_node for given port/endpoint + * @node: pointer to parent device_node containing graph port/endpoint + * @port: identifier (value of reg property) of the parent port node + * @endpoint: identifier (value of reg property) of the endpoint node + * + * Return: Remote device node associated with remote endpoint node linked + * to @node. Use of_node_put() on it when done. + */ +struct device_node *of_graph_get_remote_node(const struct device_node *node, + u32 port, u32 endpoint) +{ + struct device_node *endpoint_node, *remote; + + endpoint_node = of_graph_get_endpoint_by_regs(node, port, endpoint); + if (!endpoint_node) { + pr_debug("no valid endpoint (%d, %d) for node %s\n", + port, endpoint, node->full_name); + return NULL; + } + + remote = of_graph_get_remote_port_parent(endpoint_node); + of_node_put(endpoint_node); + if (!remote) { + pr_debug("no valid remote node\n"); + return NULL; + } + + if (!of_device_is_available(remote)) { + pr_debug("not available for remote node\n"); + return NULL; + } + + return remote; +} +EXPORT_SYMBOL(of_graph_get_remote_node); diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h index bb3a5a2cd570..abdb02eaef06 100644 --- a/include/linux/of_graph.h +++ b/include/linux/of_graph.h @@ -51,6 +51,8 @@ struct device_node *of_graph_get_endpoint_by_regs( struct device_node *of_graph_get_remote_port_parent( const struct device_node *node); struct device_node *of_graph_get_remote_port(const struct device_node *node); +struct device_node *of_graph_get_remote_node(const struct device_node *node, + u32 port, u32 endpoint); #else static inline int of_graph_parse_endpoint(const struct device_node *node, @@ -89,6 +91,12 @@ static inline struct device_node *of_graph_get_remote_port( { return NULL; } +static inline struct device_node *of_graph_get_remote_node( + const struct device_node *node, + u32 port, u32 endpoint) +{ + return NULL; +} #endif /* CONFIG_OF */ |