Brooklyn/arch/arm/boot/dts/overlays/rpi-backlight-overlay.dts

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/*
* Devicetree overlay for mailbox-driven Raspberry Pi DSI Display
* backlight controller
*/
/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2835";
fragment@0 {
target-path = "/";
__overlay__ {
rpi_backlight: rpi_backlight {
compatible = "raspberrypi,rpi-backlight";
firmware = <&firmware>;
status = "okay";
};
};
};
};