media: Documentation: v4l2_ctrl_new_std_compound

Function for initializing compound controls with a default value.
Suggested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Ricardo Ribalda Delgado <ribalda@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Documentation/media/kapi/v4l2-controls.rst

@@ -140,6 +140,15 @@ Menu controls with a driver specific menu are added by calling
                        const struct v4l2_ctrl_ops *ops, u32 id, s32 max,
                        s32 skip_mask, s32 def, const char * const *qmenu);
 
+Standard compound controls can be added by calling
+:c:func:`v4l2_ctrl_new_std_compound`:
+
+.. code-block:: c
+
+       struct v4l2_ctrl *v4l2_ctrl_new_std_compound(struct v4l2_ctrl_handler *hdl,
+                       const struct v4l2_ctrl_ops *ops, u32 id,
+                       const union v4l2_ctrl_ptr p_def);
+
 Integer menu controls with a driver specific menu can be added by calling
 :c:func:`v4l2_ctrl_new_int_menu`: