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Unverified Commit a1c55bcc authored by Maxime Ripard's avatar Maxime Ripard
Browse files

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



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: default avatarChen-Yu Tsai <wens@csie.org>
Reviewed-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/0c0819bdf88fa948188df95e57a10820a8a4548d.1513854122.git-series.maxime.ripard@free-electrons.com
parent 2e7e2ebc

drivers/gpu/drm/panel/panel-lvds.c

+23 −0
Original line number Diff line number Diff line
@@ -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);