Add a document for ext control colorimetry class.

Signed-off-by: Stanimir Varbanov <redacted>
---
 .../userspace-api/media/v4l/common.rst        |  1 +
 .../media/v4l/ext-ctrls-colorimetry.rst       | 19 +++++++++++++++++++
 .../media/v4l/vidioc-g-ext-ctrls.rst          |  4 ++++
 3 files changed, 24 insertions(+)
 create mode 100644 Documentation/userspace-api/media/v4l/ext-ctrls-colorimetry.rst

diff --git a/Documentation/userspace-api/media/v4l/common.rst b/Documentation/userspace-api/media/v4l/common.rst
index 8c263c5a85d8..ea0435182e44 100644
--- a/Documentation/userspace-api/media/v4l/common.rst
+++ b/Documentation/userspace-api/media/v4l/common.rst

@@ -51,6 +51,7 @@ applicable to all devices.
     ext-ctrls-fm-tx
     ext-ctrls-fm-rx
     ext-ctrls-detect
+    ext-ctrls-colorimetry
     fourcc
     format
     planar-apis

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-colorimetry.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-colorimetry.rst
new file mode 100644
index 000000000000..6b0cd2054e84
--- /dev/null
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-colorimetry.rst

@@ -0,0 +1,19 @@
+.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
+
+.. _colorimetry-controls:
+
+*****************************
+Colorimetry Control Reference
+*****************************
+
+Below are controls within the Colorimetry control class.

+
+Colorimetry Control IDs
+-----------------------
+
+.. _colorimetry-control-id:
+
+``V4L2_CID_COLORIMETRY_CLASS (class)``
+    The Colorimetry class descriptor. Calling
+    :ref:`VIDIOC_QUERYCTRL` for this control will
+    return a description of this control class.

diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
index b9c62affbb5a..8a95ebdd499a 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst

@@ -394,6 +394,10 @@ still cause this situation.
       - 0xa40000
       - The class containing stateless codec controls. These controls are
 	described in :ref:`codec-stateless-controls`.
+    * - ``V4L2_CTRL_CLASS_COLORIMETRY``
+      - 0xa50000
+      - The class containing colorimetry controls. These controls are
+	described in :ref:`colorimetry-controls`.
 
 Return Value
 ============