Add the documentation for the MM21 video format, used by the MT8183
codec and MDP3 image processor.

Signed-off-by: Alexandre Courbot <[email protected]>
---
 Documentation/media/uapi/v4l/pixfmt-reserved.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/media/uapi/v4l/pixfmt-reserved.rst 
b/Documentation/media/uapi/v4l/pixfmt-reserved.rst
index b2cd155e691b..10d5bda9ffc7 100644
--- a/Documentation/media/uapi/v4l/pixfmt-reserved.rst
+++ b/Documentation/media/uapi/v4l/pixfmt-reserved.rst
@@ -264,6 +264,16 @@ please make a proposal on the linux-media mailing list.
        of tiles, resulting in 32-aligned resolutions for the luminance plane
        and 16-aligned resolutions for the chrominance plane (with 2x2
        subsampling).
+    * .. _V4L2-PIX-FMT-MM21:
+
+      - ``V4L2_PIX_FMT_MM21``
+      - 'MM21'
+      - Non-compressed two-planar block format used by Mediatek MT8183.
+       The compression is lossless.
+       It is an opaque intermediate format and the MDP3 hardware must be
+       used to convert ``V4L2_PIX_FMT_MM21`` to a non-proprietary video
+       format.
+
 
 .. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
 
-- 
2.23.0.187.g17f5b7556c-goog

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