Re: [PATCH 2/3] drm/panel: ld9040: Register a backlight device

[Sam Ravnborg]

Hi Paul,

On Mon, Jul 03, 2023 at 11:47:14PM +0200, Paul Cercueil wrote:
> Register a backlight device to be able to switch between all the gamma
> levels.
> 
> Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/panel/panel-samsung-ld9040.c | 40 ++++++++++++++++++++
>  1 file changed, 40 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/panel-samsung-ld9040.c b/drivers/gpu/drm/panel/panel-samsung-ld9040.c
> index 7fd9444b42c5..b4f87d6244cb 100644
> --- a/drivers/gpu/drm/panel/panel-samsung-ld9040.c
> +++ b/drivers/gpu/drm/panel/panel-samsung-ld9040.c
> @@ -8,6 +8,7 @@
>   * Andrzej Hajda <a.hajda@xxxxxxxxxxx>
>  */
>  
> +#include <linux/backlight.h>
>  #include <linux/delay.h>
>  #include <linux/gpio/consumer.h>
>  #include <linux/module.h>
> @@ -311,8 +312,40 @@ static int ld9040_parse_dt(struct ld9040 *ctx)
>  	return 0;
>  }
>  
> +static int ld9040_bl_update_status(struct backlight_device *dev)
> +{
> +	struct ld9040 *ctx = dev_get_drvdata(&dev->dev);
There is also the helper bl_get_data() - that do the same.

	Sam