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drm/omap: panel-dpi: make (limited) use of a reset gpio

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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.

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>
This commit is contained in:
Uwe Kleine-König 2016-03-21 22:10:26 +01:00 committed by Tomi Valkeinen
parent 24fe238681
commit e2513b3f56
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/omapdrm/displays/panel-dpi.c
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@ -213,6 +213,16 @@ static int panel_dpi_probe_of(struct platform_device *pdev)
ddata->enable_gpio = gpio;
/*
* Many different panels are supported by this driver and there are
* probably very different needs for their reset pins in regards to
* timing and order relative to the enable gpio. So for now it's just
* ensured that the reset line isn't active.
*/
gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
ddata->backlight_gpio = -ENOENT;
r = of_get_display_timing(node, "panel-timing", &timing);