On 20/12/15 13:13, Uwe Kleine-König wrote: > 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> > -- > Changes since (implicit) v1, sent with > Message-Id: 1449753107-11410-4-git-send-email-uwe@xxxxxxxxxxxxxxxxx : > > - never assert reset because there are too many different panels with > too many different needs for their reset. > - split out dt binding changes > - reword commit log Please add these extra texts below the --- line below. Otherwise they end up in the commit description. > --- > drivers/video/fbdev/omap2/displays-new/panel-dpi.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/video/fbdev/omap2/displays-new/panel-dpi.c b/drivers/video/fbdev/omap2/displays-new/panel-dpi.c > index e780fd4f8b46..201a1c1a6f42 100644 > --- a/drivers/video/fbdev/omap2/displays-new/panel-dpi.c > +++ b/drivers/video/fbdev/omap2/displays-new/panel-dpi.c > @@ -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); >
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