BB-GRAPH-AUDIO-PCM5XXX-00A0.dts

/*
 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/dts-v1/;
/plugin/;

#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/pinctrl/am33xx.h>

/*
 * Helper to show loaded overlays under: /proc/device-tree/chosen/overlays/
 */
&{/chosen} {
	overlays {
		BB-GRAPH-AUDIO-PCM5XXX-00A0 = __TIMESTAMP__;
	};
};


/*
 * Free up the pins used by the cape from the pinmux helpers.
 */
&ocp {
	P9_25_pinmux { status = "disabled"; };  /* mcasp0_ahclkx */
	P9_28_pinmux { status = "disabled"; };  /* mcasp0_axr2 */
	P9_29_pinmux { status = "disabled"; };  /* mcasp0_fsx */
	P9_30_pinmux { status = "disabled"; };  /* mcasp0_axr0 */
	P9_31_pinmux { status = "disabled"; };  /* mcasp0_aclkx */
};

&am33xx_pinmux {
	mcasp0_pins: mcasp0_pins {
		pinctrl-single,pins = <
			AM33XX_PADCONF(AM335X_PIN_MCASP0_AHCLKX, PIN_INPUT_PULLUP, MUX_MODE0)	/* P9_25 */
			AM33XX_PADCONF(AM335X_PIN_MCASP0_AHCLKR, PIN_OUTPUT_PULLDOWN, MUX_MODE2)/* P9_28 mcasp0_axr2 */
			AM33XX_PADCONF(AM335X_PIN_MCASP0_FSX, PIN_OUTPUT_PULLUP, MUX_MODE0)	/* P9_29 */
			AM33XX_PADCONF(AM335X_PIN_MCASP0_AXR0, PIN_OUTPUT_PULLDOWN, MUX_MODE0)	/* P9_30 mcasp0_axr0 */
			AM33XX_PADCONF(AM335X_PIN_MCASP0_ACLKX, PIN_OUTPUT_PULLDOWN, MUX_MODE0)	/* P9_31 */
			AM33XX_PADCONF(AM335X_PIN_GPMC_A11, PIN_OUTPUT_PULLDOWN, MUX_MODE7)	/* gpmc_a11.GPIO1_27 - Clock disable */
		>;
	};
};

&mcasp0 {
	#sound-dai-cells = <0>;
	pinctrl-names = "default";
	pinctrl-0 = <&mcasp0_pins>;
	status = "okay";
	op-mode = <0>;	/* MCASP_IIS_MODE */
	tdm-slots = <2>;
	serial-dir = <	/* 0: INACTIVE, 1: TX, 2: RX */
			0 0 1 0  // Pi DAC+
//			1 0 0 0  // Pi DAC Pro
//			1 0 1 0  // Both
		>;
	tx-num-evt = <32>;
	rx-num-evt = <32>;

	mcasp0_port: port {
		cpu_dai0: endpoint@0 {
			dai-format = "i2s";
			frame-master = <&mcasp0_port>;
			bitclock-master = <&mcasp0_port>;
			remote-endpoint = <&codec_dai0>;
			clocks = <&clk_mcasp0>;
		};
/*
		// Note this does NOT work! Cannot get sound from both codecs. :(
		cpu_dai1: endpoint@1 {
			dai-format = "i2s";
			frame-master = <&mcasp0_port>;
			bitclock-master = <&mcasp0_port>;
			remote-endpoint = <&codec_dai1>;
			clocks = <&clk_mcasp0>;
		};
*/
	};
};


/*
 * Raspberry Pi DAC+/PRO power supplies
 *
 * BBB-SRM does not say which 3.3 V rail is on P9 3&4.
 * https://elinux.org/BeagleBone_Power_Management says 3v3b/3v3exp. No such power
 * rail in the device tree though :( Guess I'll have to make my own?
 *
 * SYS_5V is created from VDD_5V (power plug) or USB by TPS65217C. Also missing in the device tree!
 * vdd_3v3exp (same as vdd_3v3b on the BBB) is created from VDD_5V by TL5209. Enabled by vdd_3v3aux.
 */
&{/} {
	/*  BBB SYS_5V (P9 7&8) */
	vdd_sys5v: fixedregulator-sys5v {
		compatible = "regulator-fixed";
		regulator-name = "vdd_sys5v";
		regulator-min-microvolt = <5000000>;
		regulator-max-microvolt = <5000000>;
	};

	/*  BBB VDD_3V3B/VDD_3V3EXP (P9 3&4) */
	vdd_3v3exp: fixedregulator-3v3exp {
		compatible = "regulator-fixed";
		regulator-name = "vdd_3v3exp";
		regulator-min-microvolt = <3300000>;
		regulator-max-microvolt = <3300000>;
		vin-supply = <&vdd_sys5v>;
	};

	avdd_3v3: fixedregulator-3v3 {
		compatible = "regulator-fixed";
		regulator-name = "avdd_3v3";
		regulator-min-microvolt = <3300000>;
		regulator-max-microvolt = <3300000>;
		vin-supply = <&vdd_sys5v>;
	};


	clk_mcasp0_fixed: clk_mcasp0_fixed {
		#clock-cells = <0>;
		compatible = "fixed-clock";
		clock-frequency = <24576000>;
	};

	clk_mcasp0: clk_mcasp0 {
		#clock-cells = <0>;
		compatible = "gpio-gate-clock";
		clocks = <&clk_mcasp0_fixed>;
		enable-gpios = <&gpio1 27 0>; /* BeagleBone Black Clk enable on GPIO1_27 */
	};

	sound {
		compatible = "audio-graph-card";
		label = "AmazingDAC";
/*
		routing = "codec0 Playback", "DAI0 Playback",
			  "codec1 Playback", "DAI1 Playback";
*/
		dais = <&mcasp0_port>;
        };
};

&i2c2 {
	#address-cells = <1>;
	#size-cells = <0>;
	pcm5122@4c {
		#sound-dai-cells = <0>;
		compatible = "ti,pcm5122";
		reg = <0x4c>;

		// AVDD created on-board Pi-DAC+ from RPi pin 2 = 5 V.
		AVDD-supply = <&avdd_3v3>;
		// DVDD fed directly from RPi pin 1 = 3.3 V.
		DVDD-supply = <&vdd_3v3exp>;
		// CPVDD fed directly from RPi pin 1 = 3.3 V.
		CPVDD-supply = <&vdd_3v3exp>;

//		audio-graph-card,prefix = "codec0";
		port {
			codec_dai0: endpoint {
//				audio-graph-card,convert-channels = <2>;
				remote-endpoint = <&cpu_dai0>;
			};
		};
	};
	pcm5142@4e {
		#sound-dai-cells = <0>;
		compatible = "ti,pcm5142";
		reg = <0x4e>;

		// AVDD created on-board Pi-DAC+ from RPi pin 2 = 5 V.
		AVDD-supply = <&avdd_3v3>;
		// DVDD fed directly from RPi pin 1 = 3.3 V.
		DVDD-supply = <&vdd_3v3exp>;
		// CPVDD fed directly from RPi pin 1 = 3.3 V.
		CPVDD-supply = <&vdd_3v3exp>;

//		audio-graph-card,prefix = "codec1";
/*
		port {
			codec_dai1: endpoint {
//				audio-graph-card,convert-channels = <2>;
				remote-endpoint = <&cpu_dai1>;
			};
		};
*/
	};
};