/dts-v1/;
/plugin/;

/ {
    compatible = "brcm,bcm2835";

    /* Fragment 0: Define power regulators FIRST */
    fragment@0 {
        target-path = "/";
        __overlay__ {
            /* 3.3V regulator for analog/digital IO */
            vdd_3v3_reg: regulator_3v3 {
                compatible = "regulator-fixed";
                regulator-name = "vdd-3v3";
                regulator-min-microvolt = <3300000>;
                regulator-max-microvolt = <3300000>;
                regulator-always-on;
                regulator-boot-on;
            };

            /* 1.8V regulator for digital core - CRITICAL */
            vdd_1v8_reg: regulator_1v8 {
                compatible = "regulator-fixed";
                regulator-name = "vdd-1v8";
                regulator-min-microvolt = <1800000>;
                regulator-max-microvolt = <1800000>;
                regulator-always-on;
                regulator-boot-on;
            };
        };
    };

    fragment@1 {
        target = <&i2s>;
        __overlay__ {
            status = "okay";
        };
    };

//    fragment@1 {
//        target = <&gpio>; //"/soc/gpio@7e200000"; //<&gpio>;
//        __overlay__ {
//            gpclk0_pins: gpclk0_pins {
//                brcm,pins = <4>;  // GPIO4 is GPCLK0
//                brcm,function = <4>;  // ALT0 function
//                brcm,pull = <0>;  // No pull-up/down
//            };
//        };
//    };

//    fragment@2 {
//        target = <&clocks>; //"/soc/clock@7ef00000"; //<&clocks>;
//        __overlay__ {
//            gpclk0: gpclk0 {
//                compatible = "fixed-clock";
//                #clock-cells = <0>;
//                clock-frequency = <11289600>;  // 11.2896 MHz
//                clock-output-names = "gpclk0";
//            };
//        };
//    };

    fragment@2 {
        target = <&i2c1>; //"/soc/i2c@7e804000"; //<&i2c1>;
        __overlay__ {
            #address-cells = <1>;
            #size-cells = <0>;

            tlv320: tlv320aic3120@18 {
                compatible = "ti,tlv320aic3120";
                reg = <0x18>;
                #sound-dai-cells = <0>;
                clocks = <&dummy_clock>; //<&gpclk0>; //<&dummy_clock>;
                clock-names = "mclk";

                /* Power supply rails - CORRECT voltages */
                /* All 3.3V rails */
                HPVDD-supply = <&vdd_3v3_reg>;    /* Headphone driver power */
                SPLVDD-supply = <&vdd_3v3_reg>;   /* Speaker driver power */
                SPRVDD-supply = <&vdd_3v3_reg>; 
                AVDD-supply = <&vdd_3v3_reg>;     /* Analog power */
                IOVDD-supply = <&vdd_3v3_reg>;    /* Digital IO power */
                
                /* 1.8V rail - CRITICAL */
                DVDD-supply = <&vdd_1v8_reg>;     /* Digital core power */
                
                /* Optional: Reset GPIO */
                reset-gpios = <&gpio 17 0>;  /* GPIO17, active low */
                
                /* MICBIAS configuration */
                ai31xx-micbias-vg = <2>;  /* 0=2.0V, 1=2.5V, 2=AVDD */
            };
        };
    };

    fragment@3 {
        target-path = "/";
        __overlay__ {
            dummy_clock: dummy_clock {
                compatible = "fixed-clock";
                #clock-cells = <0>;
                clock-frequency = <11289600>; // 12.288 MHz
                clock-output-names = "dummy-mclk";
            };
            sound {
                compatible = "simple-audio-card";
                simple-audio-card,name = "TLV320AIC3120";
                simple-audio-card,format = "i2s";
                simple-audio-card,bitclock-master = <&cpu_dai>;
                simple-audio-card,frame-master = <&cpu_dai>;
                simple-audio-card,channels-min = <2>;
                simple-audio-card,channels-max = <2>;

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

                codec_dai: simple-audio-card,codec {
                    sound-dai = <&tlv320>;
                };
            };
        };
    };
};