media: mc-entity: Add a new helper function to get a remote pad for a pad

The newly added media_entity_remote_source_pad_unique() helper function
handles use cases where the entity has a link enabled uniqueness
constraint covering all pads. There are use cases where the constraint
covers a specific pad only. Add a new media_pad_remote_pad_unique()
function to handle this. It operates as
media_entity_remote_source_pad_unique(), but on a given pad instead of
on the entity.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/Documentation/driver-api/media/mc-core.rst b/Documentation/driver-api/media/mc-core.rst
index 66801506b2dd..644911936ad9 100644
--- a/Documentation/driver-api/media/mc-core.rst
+++ b/Documentation/driver-api/media/mc-core.rst
@@ -186,8 +186,9 @@ is required and the graph structure can be freed normally.
 
 Helper functions can be used to find a link between two given pads, or a pad
 connected to another pad through an enabled link
-(:c:func:`media_entity_find_link()`, :c:func:`media_pad_remote_pad_first()` and
-:c:func:`media_entity_remote_source_pad_unique()`).
+(:c:func:`media_entity_find_link()`, :c:func:`media_pad_remote_pad_first()`n
+:c:func:`media_entity_remote_source_pad_unique()` and
+:c:func:`media_pad_remote_pad_unique()`).
 
 Use count and power handling
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^