[media] v4l: of: Add v4l2_of_parse_link() function

The function fills a link data structure with the device node and port
number at both the local and remote ends of a link defined by one of its
endpoint nodes.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/include/media/v4l2-of.h b/include/media/v4l2-of.h
index 2de42c584eb2..f831c9c225b6 100644
--- a/include/media/v4l2-of.h
+++ b/include/media/v4l2-of.h
@@ -69,9 +69,26 @@ struct v4l2_of_endpoint {
         struct list_head head;
 };
 
+/**
+ * struct v4l2_of_link - a link between two endpoints
+ * @local_node: pointer to device_node of this endpoint
+ * @local_port: identifier of the port this endpoint belongs to
+ * @remote_node: pointer to device_node of the remote endpoint
+ * @remote_port: identifier of the port the remote endpoint belongs to
+ */
+struct v4l2_of_link {
+        struct device_node *local_node;
+        unsigned int local_port;
+        struct device_node *remote_node;
+        unsigned int remote_port;
+};
+
 #ifdef CONFIG_OF
 int v4l2_of_parse_endpoint(const struct device_node *node,
                            struct v4l2_of_endpoint *endpoint);
+int v4l2_of_parse_link(const struct device_node *node,
+                       struct v4l2_of_link *link);
+void v4l2_of_put_link(struct v4l2_of_link *link);
 #else /* CONFIG_OF */
 
 static inline int v4l2_of_parse_endpoint(const struct device_node *node,
@@ -80,6 +97,16 @@ static inline int v4l2_of_parse_endpoint(const struct device_node *node,
         return -ENOSYS;
 }
 
+static inline int v4l2_of_parse_link(const struct device_node *node,
+                                     struct v4l2_of_link *link)
+{
+        return -ENOSYS;
+}
+
+static inline void v4l2_of_put_link(struct v4l2_of_link *link)
+{
+}
+
 #endif /* CONFIG_OF */
 
 #endif /* _V4L2_OF_H */