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authorRob Herring <robh@kernel.org>2015-03-25 00:41:08 -0500
committerRob Herring <robh@kernel.org>2015-03-25 00:41:08 -0500
commit8147e2e8f13d823307e1edf2add5a8df84180cca (patch)
tree476eae8727d98c56027ca1036a8f61ff261c9c51 /include/linux
parentbc465aa9d045feb0e13b4a8f32cc33c1943f62d6 (diff)
parentbfe446e37c4efd8ade454911e8f80414bcbfc10d (diff)
Merge tag 'of-graph-for-4.0' of git://git.pengutronix.de/git/pza/linux into for-next
Pull of-graph helpers from Philipp Zabel: of: Add of-graph helpers to loop over endpoints and find ports by id This series converts of_graph_get_next_endpoint to decrement the refcount of the passed prev parameter. This allows to add a for_each_endpoint_of_node helper macro to loop over all endpoints in a device tree node. The of_graph_get_port_by_id function is added to retrieve a port by its known port id (contained in the reg property) from the device tree.
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/of_graph.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h
index befef42e015b..3c1c95a39e0c 100644
--- a/include/linux/of_graph.h
+++ b/include/linux/of_graph.h
@@ -26,9 +26,21 @@ struct of_endpoint {
const struct device_node *local_node;
};
+/**
+ * for_each_endpoint_of_node - iterate over every endpoint in a device node
+ * @parent: parent device node containing ports and endpoints
+ * @child: loop variable pointing to the current endpoint node
+ *
+ * When breaking out of the loop, of_node_put(child) has to be called manually.
+ */
+#define for_each_endpoint_of_node(parent, child) \
+ for (child = of_graph_get_next_endpoint(parent, NULL); child != NULL; \
+ child = of_graph_get_next_endpoint(parent, child))
+
#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(
@@ -42,6 +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)