drm/tilcdc: panel: Add support for enable GPIO

In order to support the "enable GPIO" available in many panel devices,
this commit adds a proper devicetree binding.

By providing an enable GPIO in the devicetree, the driver can now turn
off and on the panel device, and/or the backlight device. Both the
backlight and the GPIO are optional properties.

Tested-by: Darren Etheridge <detheridge@ti.com>
Tested-by: Johannes Pointner <johannes.pointner@br-automation.com>
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/drm/tilcdc/panel.txt b/Documentation/devicetree/bindings/drm/tilcdc/panel.txt
index 10a06e826b4a..4ab9e2300907 100644
--- a/Documentation/devicetree/bindings/drm/tilcdc/panel.txt
+++ b/Documentation/devicetree/bindings/drm/tilcdc/panel.txt
@@ -20,6 +20,7 @@ Required properties:
 
 Optional properties:
 - backlight: phandle of the backlight device attached to the panel
+- enable-gpios: GPIO pin to enable or disable the panel
 
 Recommended properties:
  - pinctrl-names, pinctrl-0: the pincontrol settings to configure
@@ -33,6 +34,7 @@ Example:
                 pinctrl-names = "default";
                 pinctrl-0 = <&bone_lcd3_cape_lcd_pins>;
                 backlight = <&backlight>;
+                enable-gpios = <&gpio3 19 0>;
 
                 panel-info {
                         ac-bias           = <255>;