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Subject[PATCH v3 7/7] media: open.rst: add a notice about subdev-API on vdev-centric
The documentation doesn't mention if vdev-centric hardware
control would have subdev API or not.

Add a notice about that, reflecting the current status, where
three drivers use it, in order to support some subdev-specific

Signed-off-by: Mauro Carvalho Chehab <>
Documentation/media/uapi/v4l/open.rst | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/Documentation/media/uapi/v4l/open.rst b/Documentation/media/uapi/v4l/open.rst
index 3257a0527ac9..547d191dcef2 100644
--- a/Documentation/media/uapi/v4l/open.rst
+++ b/Documentation/media/uapi/v4l/open.rst
@@ -43,6 +43,13 @@ the application to know with device nodes are available
For **MC-centric** hardware peripheral control, before using the
peripheral, it is required to set the pipelines via the

+.. note::
+ A **vdev-centric** may optionally expose V4L2 sub-devices via
+ :ref:`sub-device API <subdev>`. In that case, it has to implement
+ the :ref:`media controller API <media_controller>` as well.
:ref:`media controller API <media_controller>`. For those devices, the
sub-devices' configuration can be controlled via the
:ref:`sub-device API <subdev>`, whith creates one device node
 \ /
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