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Subject[RFC PATCH 2/3] of: Add OF graph helper to get a specific port by id
Date
This patch adds the of_graph_get_port_by_id function to get a port device
tree node by port id.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---
drivers/of/base.c | 28 ++++++++++++++++++++++++++++
include/linux/of_graph.h | 7 +++++++
2 files changed, 35 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index abfc462..7ecffbe 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2100,6 +2100,34 @@ 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 *node, int id)
+{
+ struct of_graph_entity *entity;
+ struct of_graph_port *port;
+
+ entity = __of_graph_lookup_entity(node);
+ if (WARN_ONCE(!entity || list_empty(&entity->ports),
+ "%s(): no ports specified for %s\n", __func__,
+ node->full_name))
+ return NULL;
+
+ list_for_each_entry(port, &entity->ports, list) {
+ if (port->id == id)
+ return of_node_get(port->of_node);
+ }
+
+ return NULL;
+}
+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 b6dd55b..2701054 100644
--- a/include/linux/of_graph.h
+++ b/include/linux/of_graph.h
@@ -33,6 +33,7 @@ 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, int 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(
@@ -49,6 +50,12 @@ 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,
+ int id)
+{
+ return NULL;
+}
+
static inline struct device_node *of_graph_get_next_endpoint(
const struct device_node *parent,
struct device_node *previous)
--
1.9.0


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