Rock 5B Custom Fan Curve

gistfile1.txt

/dts-v1/;
/plugin/;
/ {
        metadata {
                title = "My Custom Overlays";
                category = "misc";
                compatible = "radxa,rock-5b", "rockchip,rk3588";
                description = "My Custom Overlays";
        };

        // modify cpu fan cooling levels
        fragment@0 {
                target = <&fan0>;
                __overlay__ {
                        cooling-levels = <0 84 128 192 255>;
                };
        };
};