[media] media: add functions to allow creating interfaces

Interfaces are different than entities: they represent a
Kernel<->userspace interaction, while entities represent a
piece of hardware/firmware/software that executes a function.

Let's distinguish them by creating a separate structure to
store the interfaces.

Later patches should change the existing drivers and logic
to split the current interface embedded inside the entity
structure (device nodes) into a separate object of the graph.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/media/media-device.h b/include/media/media-device.h
index 05414e351f8e..3b14394d5701 100644
--- a/include/media/media-device.h
+++ b/include/media/media-device.h
@@ -44,6 +44,7 @@ struct device;
  * @entity_id:	Unique ID used on the last entity registered
  * @pad_id:	Unique ID used on the last pad registered
  * @link_id:	Unique ID used on the last link registered
+ * @intf_devnode_id: Unique ID used on the last interface devnode registered
  * @entities:	List of registered entities
  * @lock:	Entities list lock
  * @graph_mutex: Entities graph operation lock
@@ -73,6 +74,7 @@ struct media_device {
 	u32 entity_id;
 	u32 pad_id;
 	u32 link_id;
+	u32 intf_devnode_id;
 
 	struct list_head entities;