[PATCH v8 3/3] of: Add of_graph_get_port_by_id function
From: p.zabel@pengutronix.de (Philipp Zabel)
Date: 2015-02-23 10:54:19
Also in:
dri-devel, linux-media, lkml
Subsystem:
open firmware and flattened device tree, the rest · Maintainers:
Rob Herring, Saravana Kannan, Linus Torvalds
This patch adds a function to get a port device tree node by port id, or reg property value. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> --- 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 05b20f1..6398b9c 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c@@ -2081,6 +2081,38 @@ 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 * @prev: previous endpoint node, or NULL to get first
diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h
index e43442e..3c1c95a 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)
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2.1.4