[PATCH] drm/panel: lvds: Add support for the power-supply property

[Daniel Vetter]

git send-email from the wrong branch. Please disregard.
-Daniel

On Tue, Jan 9, 2018 at 3:03 PM, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
> From: Maxime Ripard <maxime.ripard at free-electrons.com>
>
> A significant number of panels need to power up a regulator in order to
> operate properly. Add support for the power-supply property to enable and
> disable such a regulator whenever needed.
>
> Reviewed-by: Chen-Yu Tsai <wens at csie.org>
> Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> Signed-off-by: Maxime Ripard <maxime.ripard at free-electrons.com>
> Link: https://patchwork.freedesktop.org/patch/msgid/0c0819bdf88fa948188df95e57a10820a8a4548d.1513854122.git-series.maxime.ripard@free-electrons.com
> ---
>  drivers/gpu/drm/panel/panel-lvds.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
>
> diff --git a/drivers/gpu/drm/panel/panel-lvds.c b/drivers/gpu/drm/panel/panel-lvds.c
> index e2d57c01200b..57e38a9e7ab4 100644
> --- a/drivers/gpu/drm/panel/panel-lvds.c
> +++ b/drivers/gpu/drm/panel/panel-lvds.c
> @@ -17,6 +17,7 @@
>  #include <linux/module.h>
>  #include <linux/of_platform.h>
>  #include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
>  #include <linux/slab.h>
>
>  #include <drm/drmP.h>
> @@ -39,6 +40,7 @@ struct panel_lvds {
>         bool data_mirror;
>
>         struct backlight_device *backlight;
> +       struct regulator *supply;
>
>         struct gpio_desc *enable_gpio;
>         struct gpio_desc *reset_gpio;
> @@ -69,6 +71,9 @@ static int panel_lvds_unprepare(struct drm_panel *panel)
>         if (lvds->enable_gpio)
>                 gpiod_set_value_cansleep(lvds->enable_gpio, 0);
>
> +       if (lvds->supply)
> +               regulator_disable(lvds->supply);
> +
>         return 0;
>  }
>
> @@ -76,6 +81,17 @@ static int panel_lvds_prepare(struct drm_panel *panel)
>  {
>         struct panel_lvds *lvds = to_panel_lvds(panel);
>
> +       if (lvds->supply) {
> +               int err;
> +
> +               err = regulator_enable(lvds->supply);
> +               if (err < 0) {
> +                       dev_err(lvds->dev, "failed to enable supply: %d\n",
> +                               err);
> +                       return err;
> +               }
> +       }
> +
>         if (lvds->enable_gpio)
>                 gpiod_set_value_cansleep(lvds->enable_gpio, 1);
>
> @@ -196,6 +212,13 @@ static int panel_lvds_probe(struct platform_device *pdev)
>         if (ret < 0)
>                 return ret;
>
> +       lvds->supply = devm_regulator_get_optional(lvds->dev, "power");
> +       if (IS_ERR(lvds->supply)) {
> +               ret = PTR_ERR(lvds->supply);
> +               dev_err(lvds->dev, "failed to request regulator: %d\n", ret);
> +               return ret;
> +       }
> +
>         /* Get GPIOs and backlight controller. */
>         lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable",
>                                                      GPIOD_OUT_LOW);
> --
> 2.15.1
>



-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch