Commit e2945e6c authored by Fabio Estevam's avatar Fabio Estevam Committed by Neil Armstrong
Browse files

drm/panel: seiko-43wvf1g: Add the 'enable-gpios' property 



Sometimes a GPIO is needed to turn on/off the display.

Add support for this usecase by introducing the optional 'enable-gpios'
property.

Tested on a imx53qsb board.

Signed-off-by: default avatarFabio Estevam <festevam@denx.de>
Reviewed-by: default avatarNeil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: default avatarNeil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230314111724.1520178-2-festevam@denx.de
parent 1afdbd47

drivers/gpu/drm/panel/panel-seiko-43wvf1g.c

+12 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 
 */



#include <linux/delay.h>

#include <linux/gpio/consumer.h>

#include <linux/media-bus-format.h>

#include <linux/module.h>

#include <linux/of.h>
@@ -48,6 +49,7 @@ struct seiko_panel { 
	const struct seiko_panel_desc *desc;

	struct regulator *dvdd;

	struct regulator *avdd;

	struct gpio_desc *enable_gpio;

};



static inline struct seiko_panel *to_seiko_panel(struct drm_panel *panel)
@@ -139,6 +141,8 @@ static int seiko_panel_unprepare(struct drm_panel *panel) 
	if (!p->prepared)

		return 0;



	gpiod_set_value_cansleep(p->enable_gpio, 0);



	regulator_disable(p->avdd);



	/* Add a 100ms delay as per the panel datasheet */
@@ -174,6 +178,8 @@ static int seiko_panel_prepare(struct drm_panel *panel) 
		goto disable_dvdd;

	}



	gpiod_set_value_cansleep(p->enable_gpio, 1);



	p->prepared = true;



	return 0;
@@ -252,6 +258,12 @@ static int seiko_panel_probe(struct device *dev, 
	if (IS_ERR(panel->avdd))

		return PTR_ERR(panel->avdd);



	panel->enable_gpio = devm_gpiod_get_optional(dev, "enable",

						     GPIOD_OUT_LOW);

	if (IS_ERR(panel->enable_gpio))

		return dev_err_probe(dev, PTR_ERR(panel->enable_gpio),

				     "failed to request GPIO\n");



	drm_panel_init(&panel->base, dev, &seiko_panel_funcs,

		       DRM_MODE_CONNECTOR_DPI);