[PATCH v4 14/29] media: Documentation: Improve LINK_FREQ documentation

Sakari Ailus
2026-04-08T15:40:06Z

Add a reference to the LINK_FREQ control and clarify the meaning of the
control as for C-PHY the matter is less obvious.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Mirela Rabulea <mirela.rabulea@nxp.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
---
Documentation/driver-api/media/tx-rx.rst | 3 ++-
.../userspace-api/media/v4l/ext-ctrls-image-process.rst | 4 +++-
2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/Documentation/driver-api/media/tx-rx.rst b/Documentation/driver-api/media/tx-rx.rst
index 22e1b13ecde9..7df2407817b3 100644
--- a/Documentation/driver-api/media/tx-rx.rst
+++ b/Documentation/driver-api/media/tx-rx.rst
@@ -93,7 +93,8 @@ where
* - variable or constant
- description
* - link_freq
- - The value of the ``V4L2_CID_LINK_FREQ`` integer64 menu item.
+ - The value of the :ref:`V4L2_CID_LINK_FREQ <v4l2-cid-link-freq>` integer64
+ menu item.
* - nr_of_lanes
- Number of data lanes used on the CSI-2 link.
* - 2
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-image-process.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-image-process.rst
index 6d516f041ca2..ee88933256dd 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-image-process.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-image-process.rst
@@ -24,7 +24,9 @@ Image Process Control IDs
.. _v4l2-cid-link-freq:

``V4L2_CID_LINK_FREQ (integer menu)``
- The frequency of the data bus (e.g. parallel or CSI-2).
+ The fundamental frequency of the operating symbol rate (serial interfaces
+ such as CSI-2) or the sampling rate (parallel interfaces such as DVP or
+ Bt.565) of the data interface.

.. _v4l2-cid-pixel-rate:

--
2.47.3