drm/omap: panel-dpi: implement support for a vcc regulator

To allow supporting displays that need some logic to enable power to the
display try to get a vcc-supply property from the device tree and drive
the resulting regulator accordingly.

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dpi.c b/drivers/gpu/drm/omapdrm/displays/panel-dpi.c
index 9dc1c2f..3e697e8 100644 (file)
--- a/drivers/gpu/drm/omapdrm/displays/panel-dpi.c
+++ b/drivers/gpu/drm/omapdrm/displays/panel-dpi.c
@@ -15,6 +15,7 @@
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
+#include <linux/regulator/consumer.h>
 
 #include <video/omapdss.h>
 #include <video/omap-panel-data.h>
@@ -32,6 +33,7 @@ struct panel_drv_data {
        int backlight_gpio;
 
        struct gpio_desc *enable_gpio;
+       struct regulator *vcc_supply;
 };
 
 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
@@ -83,6 +85,12 @@ static int panel_dpi_enable(struct omap_dss_device *dssdev)
        if (r)
                return r;
 
+       r = regulator_enable(ddata->vcc_supply);
+       if (r) {
+               in->ops.dpi->disable(in);
+               return r;
+       }
+
        gpiod_set_value_cansleep(ddata->enable_gpio, 1);
 
        if (gpio_is_valid(ddata->backlight_gpio))
@@ -105,6 +113,7 @@ static void panel_dpi_disable(struct omap_dss_device *dssdev)
                gpio_set_value_cansleep(ddata->backlight_gpio, 0);
 
        gpiod_set_value_cansleep(ddata->enable_gpio, 0);
+       regulator_disable(ddata->vcc_supply);
 
        in->ops.dpi->disable(in);
 
@@ -223,6 +232,10 @@ static int panel_dpi_probe_of(struct platform_device *pdev)
        if (IS_ERR(gpio))
                return PTR_ERR(gpio);
 
+       ddata->vcc_supply = devm_regulator_get(&pdev->dev, "vcc");
+       if (IS_ERR(ddata->vcc_supply))
+               return PTR_ERR(ddata->vcc_supply);
+
        ddata->backlight_gpio = -ENOENT;
 
        r = of_get_display_timing(node, "panel-timing", &timing);