linux-kernel - [PATCH v11 6/8] Documentation: media: Describe V4L2_CID_UNIT_CELL

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Message-Id: <20191007122530.17059-1-ribalda@kernel.org>
Date:   Mon,  7 Oct 2019 14:25:30 +0200
From:   Ricardo Ribalda Delgado <ribalda@...nel.org>
To:     Philipp Zabel <p.zabel@...gutronix.de>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Jacopo Mondi <jacopo@...ndi.org>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Ricardo Ribalda Delgado <ribalda@...nel.org>
Subject: [PATCH v11 6/8] Documentation: media: Describe V4L2_CID_UNIT_CELL_SIZE

New control to pass to userspace the width/height of a pixel. Which is
needed for calibration and lens selection.

Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>
Signed-off-by: Ricardo Ribalda Delgado <ribalda@...nel.org>
---
 .../media/uapi/v4l/ext-ctrls-image-source.rst          | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/media/uapi/v4l/ext-ctrls-image-source.rst b/Documentation/media/uapi/v4l/ext-ctrls-image-source.rst
index 2c3ab5796d76..2d3e2b83d6dd 100644
--- a/Documentation/media/uapi/v4l/ext-ctrls-image-source.rst
+++ b/Documentation/media/uapi/v4l/ext-ctrls-image-source.rst
@@ -55,3 +55,13 @@ Image Source Control IDs
 
 ``V4L2_CID_TEST_PATTERN_GREENB (integer)``
     Test pattern green (next to blue) colour component.
+
+``V4L2_CID_UNIT_CELL_SIZE (struct)``
+    This control returns the unit cell size in nanometers. The struct
+    :c:type:`v4l2_area` provides the width and the height in separate
+    fields to take into consideration asymmetric pixels.
+    This control does not take into consideration any possible hardware
+    binning.
+    The unit cell consists of the whole area of the pixel, sensitive and
+    non-sensitive.
+    This control is required for automatic calibration of sensors/cameras.
-- 
2.23.0