From: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Some displays have a reset input. To assert that the display is
functional the reset gpio must be deasserted.
Teach the driver to get and drive such a gpio accordingly.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
---
Documentation/devicetree/bindings/video/panel-dpi.txt | 1 +
drivers/video/fbdev/omap2/displays-new/panel-dpi.c | 7 +++++++
2 files changed, 8 insertions(+)
diff --git a/Documentation/devicetree/bindings/video/panel-dpi.txt b/Documentation/devicetree/bindings/video/panel-dpi.txt
index a40180b05bab..1a1d8f6f884f 100644
--- a/Documentation/devicetree/bindings/video/panel-dpi.txt
+++ b/Documentation/devicetree/bindings/video/panel-dpi.txt
@@ -7,6 +7,7 @@ Required properties:
Optional properties:
- label: a symbolic name for the panel
- enable-gpios: panel enable gpio
+- reset-gpios: GPIO to control the RESET pin
Required nodes:
- "panel-timing" containing video timings
diff --git a/drivers/video/fbdev/omap2/displays-new/panel-dpi.c b/drivers/video/fbdev/omap2/displays-new/panel-dpi.c
index 1216341a0d19..7e2f9e0813dc 100644
--- a/drivers/video/fbdev/omap2/displays-new/panel-dpi.c
+++ b/drivers/video/fbdev/omap2/displays-new/panel-dpi.c
@@ -32,6 +32,7 @@ struct panel_drv_data {
int backlight_gpio;
struct gpio_desc *enable_gpio;
+ struct gpio_desc *reset_gpio;
};
#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
@@ -83,6 +84,7 @@ static int panel_dpi_enable(struct omap_dss_device *dssdev)
if (r)
return r;
+ gpiod_set_value_cansleep(ddata->reset_gpio, 0);
gpiod_set_value_cansleep(ddata->enable_gpio, 1);
if (gpio_is_valid(ddata->backlight_gpio))
@@ -211,6 +213,11 @@ static int panel_dpi_probe_of(struct platform_device *pdev)
if (IS_ERR(ddata->enable_gpio))
return PTR_ERR(ddata->enable_gpio);
+ ddata->reset_gpio = devm_gpiod_get_optional(&pdev->dev,
+ "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(ddata->reset_gpio))
+ return PTR_ERR(ddata->reset_gpio);
+
ddata->backlight_gpio = -ENOENT;
r = of_get_display_timing(node, "panel-timing", &timing);
--
2.6.2
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