[参考译文] TLV320AIC3120：aic31xx_wait_bits：失败！ 启用 AGC

// Definitions for 3120 miniDSP
/dts-v1/;
/plugin/;

#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/sound/tlv320aic31xx-micbias.h>

/ {
	compatible = "brcm,bcm2835";

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

	fragment@1 {
		target = <&i2c1>;
		__overlay__ {
			#address-cells = <1>;
            #size-cells = <0>;
			status = "okay";
			clock-frequency = <100000>;
			pinctrl-names = "default";

			tlv320aic31xx: tlv320aic3120@18 {
				#sound-dai-cells = <0>;
				reg = <0x18>;
				compatible = "ti,tlv320aic3120";
//				ai31xx-micbias-vg = <MICBIAS_OFF>;
//				ai31xx-micbias-vg = <MICBIAS_2_0V>;
				ai31xx-micbias-vg = <MICBIAS_2_5V>;
//				ai31xx-micbias-vg = <MICBIAS_AVDD>;

				reset-gpios = <&gpio 23 GPIO_ACTIVE_LOW>;

//				ai31xx-ocmv = 0;
//				ai31xx-ocmv = 1;
//				ai31xx-ocmv = 2;
//				ai31xx-ocmv = 3;
				status = "okay";
			};
		};
	};

	fragment@2 {
		target = <&sound>;
		__overlay__ {
			compatible = "simple-audio-card";
			i2s-controller = <&i2s>;
			status = "okay";
			simple-audio-card,name = "tlv320aic3120-hifi";
			simple-audio-card,bitclock-slave = <&sound_master>;
			simple-audio-card,frame-slave = <&sound_master>;
			simple-audio-card,format = "i2s";

			simple-audio-card,widgets =
				"Microphone", "Mic In",
				"Speaker", "Speaker Driver";
			simple-audio-card,routing =
				"MIC1LP", "MICBIAS",
//				"MIC1LP", "Mic In",
//				"MIC1RP", "Mic In",
				"MIC1LP", "Mic In",
				"ADC", "MIC1LP",
				"Capture", "MIC1LP",
				"Speaker Driver", "SPK ClassD"; /*these are widget names mapped to options in the TI driver */


			simple-audio-card,cpu {
				sound-dai = <&i2s>;
			};

			sound_master: simple-audio-card,codec {
				sound-dai = <&tlv320aic31xx>;
				system-clock-frequency = <12000000>; /* this matches sai1 */
				
			};
		};
	};
};