media: v4l2_ctrl: Add const pointer to ctrl_ptr

This pointer is used to point to data that is constant. Thanks to this
we can avoid a lot of casting and we make more clear when the data is
constant or variable.

Suggested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
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@kernel.org>

diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 78a97b10c89e808d4bb241fd1c5f7e5fc524524f..7db9e719a583864d8d128d9bc622821ee5412e0f 100644 (file)
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -56,6 +56,7 @@ struct poll_table_struct;
  * @p_hevc_slice_params:       Pointer to an HEVC slice parameters structure.
  * @p_area:                    Pointer to an area.
  * @p:                         Pointer to a compound value.
+ * @p_const:                   Pointer to a constant compound value.
  */
 union v4l2_ctrl_ptr {
        s32 *p_s32;
@@ -78,6 +79,7 @@ union v4l2_ctrl_ptr {
        struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params;
        struct v4l2_area *p_area;
        void *p;
+       const void *p_const;
 };
 
 /**