media: v4l2-fwnode: add endpoint id field to v4l2_fwnode_link

A link is between two endpoints not between two ports to be more
precise. Add the local_id/remote_id field which stores the endpoint
reg/port property to the link. Now the link holds all necessary
information about a link.
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/v4l2-core/v4l2-fwnode.c

@@ -565,6 +565,7 @@ int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode,
 	memset(link, 0, sizeof(*link));
 
 	fwnode_graph_parse_endpoint(fwnode, &fwep);
+	link->local_id = fwep.id;
 	link->local_port = fwep.port;
 	link->local_node = fwnode_graph_get_port_parent(fwnode);
 
@@ -575,6 +576,7 @@ int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode,
 	}
 
 	fwnode_graph_parse_endpoint(fwnode, &fwep);
+	link->remote_id = fwep.id;
 	link->remote_port = fwep.port;
 	link->remote_node = fwnode_graph_get_port_parent(fwnode);
 

include/media/v4l2-fwnode.h

@@ -113,14 +113,18 @@ struct v4l2_fwnode_endpoint {
  * struct v4l2_fwnode_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
+ * @local_id: identifier of the id 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
+ * @remote_id: identifier of the id the remote endpoint belongs to
  */
 struct v4l2_fwnode_link {
 	struct fwnode_handle *local_node;
 	unsigned int local_port;
+	unsigned int local_id;
 	struct fwnode_handle *remote_node;
 	unsigned int remote_port;
+	unsigned int remote_id;
 };
 
 /**