gpio-backlight bindingsRequired properties: - compatible: "gpio-backlight" - gpios: describes the gpio that is used for enabling/disabling the backlight. refer to bindings/gpio/gpio.txt for more details.Optional properties: - default-on: enable the backlight at boot.Example: backlight { compatible = "gpio-backlight"; gpios = <&gpio3 4 GPIO_ACTIVE_HIGH>; default-on; };