Hi 2014-06-11 20:27 GMT+02:00 Ajay Kumar <ajaykumar.rs@xxxxxxxxxxx>: > This patch adds a simple driver to handle all the LCD and LED > powerup/down routines needed to support eDP/LVDS panels. > > The LCD and LED units are usually powered up via regulators, > and almost on all boards, we will have a BACKLIGHT_EN pin to > enable/ disable the backlight. > Sometimes, we can have LCD_EN switches as well. > > The routines in this driver can be used to control > panel power sequence on such boards. > > Signed-off-by: Ajay Kumar <ajaykumar.rs@xxxxxxxxxxx> > Signed-off-by: Rahul Sharma <Rahul.Sharma@xxxxxxxxxxx> > --- > .../devicetree/bindings/panel/panel-lvds.txt | 50 ++++ > drivers/gpu/drm/panel/Kconfig | 10 + > drivers/gpu/drm/panel/Makefile | 1 + > drivers/gpu/drm/panel/panel-lvds.c | 262 ++++++++++++++++++++ > 4 files changed, 323 insertions(+) > create mode 100644 Documentation/devicetree/bindings/panel/panel-lvds.txt > create mode 100644 drivers/gpu/drm/panel/panel-lvds.c > > diff --git a/Documentation/devicetree/bindings/panel/panel-lvds.txt b/Documentation/devicetree/bindings/panel/panel-lvds.txt > new file mode 100644 > index 0000000..7cb6084 > --- /dev/null > +++ b/Documentation/devicetree/bindings/panel/panel-lvds.txt > @@ -0,0 +1,50 @@ > +panel interface for eDP/lvds panels > + > +Required properties: > + - compatible: "panel-lvds" > + > +Optional properties: > + -lcd-en-gpio: > + panel LCD poweron GPIO. > + Indicates which GPIO needs to be powered up as output > + to powerup/enable the switch to the LCD panel. > + -led-en-gpio: > + panel LED enable GPIO. > + Indicates which GPIO needs to be powered up as output > + to enable the backlight. > + -panel-prepare-delay: > + delay value in ms required for panel_prepare process > + Delay in ms needed for the panel LCD unit to > + powerup completely. > + ex: delay needed till eDP panel throws HPD. > + delay needed so that we cans tart reading edid. > + -panel-enable-delay: > + delay value in ms required for panel_enable process > + Delay in ms needed for the panel backlight/LED unit > + to powerup, and delay needed between video_enable and > + backlight_enable. > + -panel-disable-delay: > + delay value in ms required for panel_disable process > + Delay in ms needed for the panel backlight/LED unit > + powerdown, and delay needed between backlight_disable > + and video_disable. > + -panel-unprepare-delay: > + delay value in ms required for panel_post_disable process > + Delay in ms needed for the panel LCD unit to > + to powerdown completely, and the minimum delay needed > + before powering it on again. > + -panel-width-mm: physical panel width [mm] > + -panel-height-mm: physical panel height [mm] > + For what are these two properties are needed? If I find some time I will give this patch a try as I need something like this for an imx6d based device. greets -- Christian Gmeiner, MSc https://soundcloud.com/christian-gmeiner -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
