Hi Maxime,
Thank you for the patch.
On Thursday, 21 December 2017 13:02:28 EET Maxime Ripard wrote:
> 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@xxxxxxxx>
> Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
> 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);
--
Regards,
Laurent Pinchart
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