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1. Overview
This application note explains how to enable the display backlight on and off, in those hardware design where the backlight is controlled by a GPIO and, therefore, can have one of the two states: off and on.
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backlight {
compatible = "gpio-backlight";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_backlight>;
gpios = <&gpio2 31 GPIO_ACTIVE_HIGH>;
default-on;
};
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3. Controlling Backlight
To turn the LCD backlight on, run the following command:
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/ # echo 0 > /sys/class/backlight/backlight/bl_power
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To turn the LCD backlight off, run the following command:
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