nixos-config/config/devterm/audremap-overlay.dts

/dts-v1/;
/plugin/;

/ {
	compatible = "brcm,bcm2711";
	
	fragment@0 {
		target = <&audio_pins>;
		__overlay__ {
			status = "okay";
		};
	};
	
	fragment@1 {
		target = <&audio_pins>;
		__overlay__ {
			brcm,pins = < 12 13 >;
			brcm,function = < 4 >; /* alt0 alt0 */
		};
	};
	
	
};