arm64: dts: ti: k3-j784s4-evm: Enable analog audio support

The audio support on J784S4-EVM is using PCM3168A[0] codec
connected to McASP0 serializers.

- Add the nodes for sound-card, audio codec, MAIN_I2C3 and
  McASP0.
- Add pinmux for I2C3, McASP0 and AUDIO_EXT_REFCLK1.
- Add necessary GPIO hogs to route the MAIN_I2C3 lines and
  McASP serializer.
- Add idle-state as 1 in mux1 to route McASP clock signals.

[0]: <https://www.ti.com/lit/gpn/pcm3168a>

Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
Link: https://lore.kernel.org/r/20240626101645.36764-4-j-choudhary@ti.com
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>

Author: jayesh-ti

arch/arm64/boot/dts/ti/k3-j784s4-evm.dts

@@ -312,6 +312,20 @@
 		compatible = "gpio-mux";
 		#mux-state-cells = <1>;
 		mux-gpios = <&exp2 14 GPIO_ACTIVE_HIGH>;
+		idle-state = <1>;
+	};
+
+	codec_audio: sound {
+		compatible = "ti,j7200-cpb-audio";
+		model = "j784s4-cpb";
+
+		ti,cpb-mcasp = <&mcasp0>;
+		ti,cpb-codec = <&pcm3168a_1>;
+
+		clocks = <&k3_clks 265 0>, <&k3_clks 265 1>,
+			 <&k3_clks 157 34>, <&k3_clks 157 63>;
+		clock-names = "cpb-mcasp-auxclk", "cpb-mcasp-auxclk-48000",
+			      "cpb-codec-scki", "cpb-codec-scki-48000";
 	};
 };
 
@@ -422,6 +436,28 @@
 			J784S4_IOPAD(0x0ec, PIN_OUTPUT, 6) /* (AN37) TIMER_IO1.USB0_DRVVBUS */
 		>;
 	};
+
+	main_i2c3_pins_default: main-i2c3-default-pins {
+		pinctrl-single,pins = <
+			J784S4_IOPAD(0x064, PIN_INPUT, 13) /* (AF38) MCAN0_TX.I2C3_SCL */
+			J784S4_IOPAD(0x060, PIN_INPUT, 13) /* (AE36) MCASP2_AXR1.I2C3_SDA */
+		>;
+	};
+
+	main_mcasp0_pins_default: main-mcasp0-default-pins {
+		pinctrl-single,pins = <
+			J784S4_IOPAD(0x038, PIN_OUTPUT_PULLDOWN, 1) /* (AK35) MCASP0_ACLKX */
+			J784S4_IOPAD(0x03c, PIN_OUTPUT_PULLDOWN, 1) /* (AK38) MCASP0_AFSX */
+			J784S4_IOPAD(0x07c, PIN_OUTPUT_PULLDOWN, 1) /* (AJ38) MCASP0_AXR3 */
+			J784S4_IOPAD(0x080, PIN_INPUT_PULLDOWN, 1) /* (AK34) MCASP0_AXR4 */
+		>;
+	};
+
+	audio_ext_refclk1_pins_default: audio-ext-refclk1-default-pins {
+		pinctrl-single,pins = <
+			J784S4_IOPAD(0x078, PIN_OUTPUT, 1) /* (AH37) MCAN2_RX.AUDIO_EXT_REFCLK1 */
+		>;
+	};
 };
 
 &wkup_pmx2 {
@@ -881,6 +917,14 @@
 				  "PCIE0_4L_RC_RSTZ", "PCIE0_4L_EP_RST_EN", "PCIE1_4L_PRSNT#",
 				  "PCIE0_4L_PRSNT#", "CDCI1_OE1/OE4", "CDCI1_OE2/OE3",
 				  "AUDIO_MUX_SEL", "EXP_MUX2", "EXP_MUX3", "GESI_EXP_PHY_RSTZ";
+
+		p12-hog {
+			/* P12 - AUDIO_MUX_SEL */
+			gpio-hog;
+			gpios = <12 GPIO_ACTIVE_HIGH>;
+			output-low;
+			line-name = "AUDIO_MUX_SEL";
+		};
 	};
 
 	exp2: gpio@22 {
@@ -896,6 +940,22 @@
 				  "CANUART_MUX1_SEL1", "ENET1_EXP_PWRDN", "ENET1_EXP_RESETZ",
 				  "ENET1_I2CMUX_SEL", "ENET1_EXP_SPARE2", "ENET2_EXP_RESETZ",
 				  "USER_INPUT1", "USER_LED1", "USER_LED2";
+
+		p13-hog {
+			/* P13 - CANUART_MUX_SEL0 */
+			gpio-hog;
+			gpios = <13 GPIO_ACTIVE_HIGH>;
+			output-high;
+			line-name = "CANUART_MUX_SEL0";
+		};
+
+		p15-hog {
+			/* P15 - CANUART_MUX1_SEL1 */
+			gpio-hog;
+			gpios = <15 GPIO_ACTIVE_HIGH>;
+			output-high;
+			line-name = "CANUART_MUX1_SEL1";
+		};
 	};
 };
 
@@ -1373,3 +1433,54 @@
 	phys = <&serdes1_pcie0_link>;
 	phy-names = "pcie-phy";
 };
+
+&k3_clks {
+	/* Confiure AUDIO_EXT_REFCLK1 pin as output */
+	pinctrl-names = "default";
+	pinctrl-0 = <&audio_ext_refclk1_pins_default>;
+};
+
+&main_i2c3 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_i2c3_pins_default>;
+	clock-frequency = <400000>;
+
+	exp3: gpio@20 {
+		compatible = "ti,tca6408";
+		reg = <0x20>;
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
+
+	pcm3168a_1: audio-codec@44 {
+		compatible = "ti,pcm3168a";
+		reg = <0x44>;
+		#sound-dai-cells = <1>;
+		reset-gpios = <&exp3 0 GPIO_ACTIVE_LOW>;
+		clocks = <&audio_refclk1>;
+		clock-names = "scki";
+		VDD1-supply = <&vsys_3v3>;
+		VDD2-supply = <&vsys_3v3>;
+		VCCAD1-supply = <&vsys_5v0>;
+		VCCAD2-supply = <&vsys_5v0>;
+		VCCDA1-supply = <&vsys_5v0>;
+		VCCDA2-supply = <&vsys_5v0>;
+	};
+};
+
+&mcasp0 {
+	status = "okay";
+	#sound-dai-cells = <0>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_mcasp0_pins_default>;
+	op-mode = <0>;          /* MCASP_IIS_MODE */
+	tdm-slots = <2>;
+	auxclk-fs-ratio = <256>;
+	serial-dir = <	/* 0: INACTIVE, 1: TX, 2: RX */
+		0 0 0 1
+		2 0 0 0
+		0 0 0 0
+		0 0 0 0
+	>;
+};