From bfe446e37c4efd8ade454911e8f80414bcbfc10d Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Tue, 11 Mar 2014 11:21:11 +0100 Subject: [PATCH] of: Add of_graph_get_port_by_id function This patch adds a function to get a port device tree node by port id, or reg property value. Signed-off-by: Philipp Zabel Acked-by: Laurent Pinchart --- drivers/of/base.c | 32 ++++++++++++++++++++++++++++++++ include/linux/of_graph.h | 7 +++++++ 2 files changed, 39 insertions(+) diff --git a/drivers/of/base.c b/drivers/of/base.c index 05b20f1cca7b..6398b9ca9157 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -2080,6 +2080,38 @@ int of_graph_parse_endpoint(const struct device_node *node, } EXPORT_SYMBOL(of_graph_parse_endpoint); +/** + * of_graph_get_port_by_id() - get the port matching a given id + * @parent: pointer to the parent device node + * @id: id of the port + * + * Return: A 'port' node pointer with refcount incremented. The caller + * has to use of_node_put() on it when done. + */ +struct device_node *of_graph_get_port_by_id(struct device_node *parent, u32 id) +{ + struct device_node *node, *port; + + node = of_get_child_by_name(parent, "ports"); + if (node) + parent = node; + + for_each_child_of_node(parent, port) { + u32 port_id = 0; + + if (of_node_cmp(port->name, "port") != 0) + continue; + of_property_read_u32(port, "reg", &port_id); + if (id == port_id) + break; + } + + of_node_put(node); + + return port; +} +EXPORT_SYMBOL(of_graph_get_port_by_id); + /** * of_graph_get_next_endpoint() - get next endpoint node * @parent: pointer to the parent device node diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h index e43442efcbe5..3c1c95a39e0c 100644 --- a/include/linux/of_graph.h +++ b/include/linux/of_graph.h @@ -40,6 +40,7 @@ struct of_endpoint { #ifdef CONFIG_OF int of_graph_parse_endpoint(const struct device_node *node, struct of_endpoint *endpoint); +struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id); struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, struct device_node *previous); struct device_node *of_graph_get_remote_port_parent( @@ -53,6 +54,12 @@ static inline int of_graph_parse_endpoint(const struct device_node *node, return -ENOSYS; } +static inline struct device_node *of_graph_get_port_by_id( + struct device_node *node, u32 id) +{ + return NULL; +} + static inline struct device_node *of_graph_get_next_endpoint( const struct device_node *parent, struct device_node *previous) -- 2.20.1