[libcamera-devel] [PATCH v10 04/13] media: v4l2-ctrl: Document V4L2_CID_CAMERA_ORIENTATION

[Jacopo Mondi]

Add documentation for the V4L2_CID_CAMERA_ORIENTATION camera
control. The newly added read-only control reports the camera device
orientation relative to the usage orientation of the system the camera
is installed on.

Signed-off-by: Jacopo Mondi <jacopo at jmondi.org>
---
 .../media/v4l/ext-ctrls-camera.rst            | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-camera.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-camera.rst
index e39f84d2447f8..01e104bab6b3d 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-camera.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-camera.rst
@@ -510,6 +510,36 @@ enum v4l2_scene_mode -
     value down. A value of zero stops the motion if one is in progress
     and has no effect otherwise.
 
+``V4L2_CID_CAMERA_ORIENTATION (integer)``
+    This read-only control describes the camera orientation by reporting
+    its mounting position on the device where the camera is installed. The
+    control value is constant and not modifiable by software. This control is
+    particularly meaningful for devices which have a well defined orientation,
+    such as phones, laptops and portable devices since the control is expressed
+    as a position relative to the device's intended usage orientation.
+    For example, a camera installed on the user-facing side of a phone,
+    a tablet or a laptop device is said to be have ``V4L2_ORIENTATION_FRONT``
+    orientation, while a camera installed on the opposite side of the front one
+    is said to be have ``V4L2_ORIENTATION_BACK`` orientation. Camera sensors not
+    directly attached to the device, or attached in a way that allows them to
+    move freely, such as webcams and digital cameras, are said to have the
+    ``V4L2_ORIENTATION_EXTERNAL`` orientation.
+
+
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    * - ``V4L2_ORIENTATION_FRONT``
+      - The camera is oriented towards the user facing side of the device.
+    * - ``V4L2_ORIENTATION_BACK``
+      - The camera is oriented towards the back facing side of the device.
+    * - ``V4L2_ORIENTATION_EXTERNAL``
+      - The camera is not directly attached to the device and is freely movable.
+
+
+
 .. [#f1]
    This control may be changed to a menu control in the future, if more
    options are required.
-- 
2.26.1