[v2,06/10] media: ar0521: Add LINK_FREQ control

Add support for V4L2_CID_LINK_FREQ which currently reports a single
hard-coded frequency which depends on the fixed pixel clock.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
---
 drivers/media/i2c/ar0521.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

Hi Jacopo

On Sat, 22 Oct 2022 at 11:38, Jacopo Mondi <jacopo@jmondi.org> wrote:
>
> Add support for V4L2_CID_LINK_FREQ which currently reports a single
> hard-coded frequency which depends on the fixed pixel clock.
>
> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
> ---
>  drivers/media/i2c/ar0521.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> diff --git a/drivers/media/i2c/ar0521.c b/drivers/media/i2c/ar0521.c
> index fcd852760750..2310346f11d5 100644
> --- a/drivers/media/i2c/ar0521.c
> +++ b/drivers/media/i2c/ar0521.c
> @@ -89,6 +89,10 @@ static const char * const ar0521_supply_names[] = {
>         "vaa",          /* Analog (2.7V) supply */
>  };
>
> +static const s64 ar0521_link_frequencies[] = {
> +       184000000,
> +};
> +
>  struct ar0521_ctrls {
>         struct v4l2_ctrl_handler handler;
>         struct {
> @@ -547,6 +551,13 @@ static int ar0521_s_ctrl(struct v4l2_ctrl *ctrl)
>                 ret = ar0521_write_reg(sensor, AR0521_REG_TEST_PATTERN_MODE,
>                                        ctrl->val);
>                 break;
> +       case V4L2_CID_LINK_FREQ:
> +               /*
> +                * Link frequency index is used at PLL configuration time,
> +                * nothing to do here.
> +                */
> +               ret = 0;
> +               break;

Defining as read only removes the need for this, but it depends on
whether you expect to have userspace changing it in the future.

As it stands it works, so:

Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

>         default:
>                 dev_err(&sensor->i2c_client->dev,
>                         "Unsupported control %x\n", ctrl->id);
> @@ -611,6 +622,10 @@ static int ar0521_init_controls(struct ar0521_dev *sensor)
>         ctrls->exposure = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_EXPOSURE, 0,
>                                             65535, 1, 360);
>
> +       v4l2_ctrl_new_int_menu(hdl, ops, V4L2_CID_LINK_FREQ,
> +                              ARRAY_SIZE(ar0521_link_frequencies) - 1,
> +                              0, ar0521_link_frequencies);
> +
>         ctrls->test_pattern = v4l2_ctrl_new_std_menu_items(hdl, ops,
>                                         V4L2_CID_TEST_PATTERN,
>                                         ARRAY_SIZE(test_pattern_menu) - 1,
> --
> 2.37.3
>