Brooklyn/arch/arm/boot/dts/overlays/audiosense-pi-overlay.dts

// Definitions for audiosense add on soundcard
/dts-v1/;
/plugin/;
#include <dt-bindings/pinctrl/bcm2835.h>
#include <dt-bindings/gpio/gpio.h>

/ {
	compatible = "brcm,bcm2835";

	fragment@0 {
		target = <&i2s>;
		__overlay__ {
			status = "okay";
		};
	};

	fragment@1 {
		target-path = "/";
		__overlay__ {
			codec_reg_1v8: codec-reg-1v8 {
				compatible = "regulator-fixed";
				regulator-name = "tlv320aic3204_1v8";
				regulator-min-microvolt = <1800000>;
				regulator-max-microvolt = <1800000>;
				regulator-always-on;
			};

			/* audio external oscillator */
			codec_osc: codec_osc {
				compatible = "fixed-clock";
				#clock-cells = <0>;
				clock-frequency = <12000000>;	/* 12 MHz */
			};
		};
	};

	fragment@2 {
		target = <&gpio>;
		__overlay__ {
			codec_rst: codec-rst {
				brcm,pins = <26>;
				brcm,function = <BCM2835_FSEL_GPIO_OUT>;
			};
		};
	};

	fragment@3 {
		target = <&i2c1>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";

			codec: tlv320aic32x4@18 {
				#sound-dai-cells = <0>;
				compatible = "ti,tlv320aic32x4";
				reg = <0x18>;

				clocks = <&codec_osc>;
				clock-names = "mclk";

				iov-supply = <&vdd_3v3_reg>;
				ldoin-supply = <&vdd_3v3_reg>;

				gpio-controller;
				#gpio-cells = <2>;
				reset-gpios = <&gpio 26 GPIO_ACTIVE_HIGH>;

				status = "okay";
			};
		};
	};

	fragment@4 {
		target = <&sound>;
		__overlay__ {
			compatible = "as,audiosense-pi";
			i2s-controller = <&i2s>;
			status = "okay";
		};
	};
};