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media: v4l2-ctrls.h: clarify the p_def argument of v4l2_ctrl_new_std_compound 

It was not sufficiently clear how to create and use p_def.
Improve the documentation.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Hans Verkuil 2020-04-23 13:42:32 +02:00 committed by Mauro Carvalho Chehab
parent e5ad7db4b2
commit e51759f56d
1 changed files with 3 additions and 1 deletions
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4
include/media/v4l2-ctrls.h
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@ -685,7 +685,9 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
* @p_def: The control's default value.
*
* Sames as v4l2_ctrl_new_std(), but with support to compound controls, thanks
* to the @p_def field.
* to the @p_def field. Use v4l2_ctrl_ptr_create() to create @p_def from a
* pointer. Use v4l2_ctrl_ptr_create(NULL) if the default value of the
* compound control should be all zeroes.
*
*/
struct v4l2_ctrl *v4l2_ctrl_new_std_compound(struct v4l2_ctrl_handler *hdl,