[PATCH v2 01/12] media: v4l2-common: Constify media_pad argument to v4l2_get_link_freq()

[Frank Li]

On Thu, Aug 21, 2025 at 03:09:33AM +0300, Laurent Pinchart wrote:
> The v4l2_get_link_freq() macro doesn't modify the pad argument. Make it
> possible to call it with a const media_pad pointer.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>

Reviewed-by: Frank Li <Frank.Li at nxp.com>

> ---
>  drivers/media/v4l2-core/v4l2-common.c | 2 +-
>  include/media/v4l2-common.h           | 3 ++-
>  2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
> index a5334aa35992..4d686338e345 100644
> --- a/drivers/media/v4l2-core/v4l2-common.c
> +++ b/drivers/media/v4l2-core/v4l2-common.c
> @@ -551,7 +551,7 @@ s64 __v4l2_get_link_freq_ctrl(struct v4l2_ctrl_handler *handler,
>  EXPORT_SYMBOL_GPL(__v4l2_get_link_freq_ctrl);
>
>  #ifdef CONFIG_MEDIA_CONTROLLER
> -s64 __v4l2_get_link_freq_pad(struct media_pad *pad, unsigned int mul,
> +s64 __v4l2_get_link_freq_pad(const struct media_pad *pad, unsigned int mul,
>  			     unsigned int div)
>  {
>  	struct v4l2_mbus_config mbus_config = {};
> diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
> index 39dd0c78d70f..ede24e60dbec 100644
> --- a/include/media/v4l2-common.h
> +++ b/include/media/v4l2-common.h
> @@ -580,10 +580,11 @@ int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, u32 pixelformat,
>  #ifdef CONFIG_MEDIA_CONTROLLER
>  #define v4l2_get_link_freq(pad, mul, div)				\
>  	_Generic(pad,							\
> +		 const struct media_pad *: __v4l2_get_link_freq_pad,	\
>  		 struct media_pad *: __v4l2_get_link_freq_pad,		\
>  		 struct v4l2_ctrl_handler *: __v4l2_get_link_freq_ctrl)	\
>  	(pad, mul, div)
> -s64 __v4l2_get_link_freq_pad(struct media_pad *pad, unsigned int mul,
> +s64 __v4l2_get_link_freq_pad(const struct media_pad *pad, unsigned int mul,
>  			     unsigned int div);
>  #else
>  #define v4l2_get_link_freq(handler, mul, div)		\
> --
> Regards,
>
> Laurent Pinchart
>