[PATCH v2 3/4] arm64: dts: freescale: imx93-var-som: Add support for WM8904 audio codec

[Stefano Radaelli <stefano.radaelli21@gmail.com>]

The VAR-SOM-MX93 can integrate the WM8904, a high-performance
ultra-low-power stereo codec optimized for portable audio applications.

This patch adds the WM8904 device to the appropriate I2C bus, enables
the SAI peripheral, and introduces the sound node to expose the
sound card to the system.

Signed-off-by: Stefano Radaelli <stefano.radaelli21@gmail.com>
---
v2:
 - Fix pinctrl alignment

 .../boot/dts/freescale/imx93-var-som.dtsi     | 93 +++++++++++++++++++
 1 file changed, 93 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx93-var-som.dtsi b/arch/arm64/boot/dts/freescale/imx93-var-som.dtsi
index 85fd9c9c9372..0b7f6740e5ad 100644
--- a/arch/arm64/boot/dts/freescale/imx93-var-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx93-var-som.dtsi
@@ -12,6 +12,34 @@ /{
 	model = "Variscite VAR-SOM-MX93 module";
 	compatible = "variscite,var-som-mx93", "fsl,imx93";
 
+	sound {
+		compatible = "simple-audio-card";
+		simple-audio-card,bitclock-master = <&codec_dai>;
+		simple-audio-card,format = "i2s";
+		simple-audio-card,frame-master = <&codec_dai>;
+		simple-audio-card,name = "wm8904-audio";
+		simple-audio-card,routing =
+			"Headphone Jack", "HPOUTL",
+			"Headphone Jack", "HPOUTR",
+			"IN2L", "Line In Jack",
+			"IN2R", "Line In Jack",
+			"IN1L", "Microphone Jack",
+			"IN1R", "Microphone Jack";
+		simple-audio-card,widgets =
+			"Microphone", "Microphone Jack",
+			"Headphone", "Headphone Jack",
+			"Line", "Line In Jack";
+		simple-audio-card,mclk-fs = <256>;
+
+		codec_dai: simple-audio-card,codec {
+			sound-dai = <&wm8904>;
+		};
+
+		simple-audio-card,cpu {
+			sound-dai = <&sai1>;
+		};
+	};
+
 	usdhc3_pwrseq: mmc-pwrseq {
 		compatible = "mmc-pwrseq-simple";
 		post-power-on-delay-ms = <100>;
@@ -152,6 +180,36 @@ ldo5: LDO5 {
 			};
 		};
 	};
+
+	wm8904: audio-codec@1a {
+		compatible = "wlf,wm8904";
+		reg = <0x1a>;
+		#sound-dai-cells = <0>;
+		clocks = <&clk IMX93_CLK_SAI1_GATE>;
+		clock-names = "mclk";
+		AVDD-supply = <&buck5>;
+		CPVDD-supply = <&buck5>;
+		DBVDD-supply = <&buck4>;
+		DCVDD-supply = <&buck5>;
+		MICVDD-supply = <&buck5>;
+		wlf,drc-cfg-names = "default", "peaklimiter", "tradition",
+				    "soft", "music";
+		/*
+		 * Config registers per name, respectively:
+		 * KNEE_IP = 0,   KNEE_OP = 0,     HI_COMP = 1,   LO_COMP = 1
+		 * KNEE_IP = -24, KNEE_OP = -6,    HI_COMP = 1/4, LO_COMP = 1
+		 * KNEE_IP = -42, KNEE_OP = -3,    HI_COMP = 0,   LO_COMP = 1
+		 * KNEE_IP = -45, KNEE_OP = -9,    HI_COMP = 1/8, LO_COMP = 1
+		 * KNEE_IP = -30, KNEE_OP = -10.5, HI_COMP = 1/4, LO_COMP = 1
+		 */
+		wlf,drc-cfg-regs = /bits/ 16 <0x01af 0x3248 0x0000 0x0000>,
+				   /bits/ 16 <0x04af 0x324b 0x0010 0x0408>,
+				   /bits/ 16 <0x04af 0x324b 0x0028 0x0704>,
+				   /bits/ 16 <0x04af 0x324b 0x0018 0x078c>,
+				   /bits/ 16 <0x04af 0x324b 0x0010 0x050e>;
+		/* GPIO1 = DMIC_CLK, don't touch others */
+		wlf,gpio-cfg = <0x0018>, <0xffff>, <0xffff>, <0xffff>;
+	};
 };
 
 /* BT module */
@@ -166,6 +224,17 @@ bluetooth {
 	};
 };
 
+&sai1 {
+	pinctrl-names = "default", "sleep";
+	pinctrl-0 = <&pinctrl_sai1>;
+	pinctrl-1 = <&pinctrl_sai1_sleep>;
+	assigned-clocks = <&clk IMX93_CLK_SAI1>;
+	assigned-clock-parents = <&clk IMX93_CLK_AUDIO_PLL>;
+	assigned-clock-rates = <12288000>;
+	fsl,sai-mclk-direction-output;
+	status = "okay";
+};
+
 /* eMMC */
 &usdhc1 {
 	pinctrl-names = "default", "state_100mhz", "state_200mhz";
@@ -247,6 +316,30 @@ MX93_PAD_DAP_TCLK_SWCLK__LPUART5_CTS_B  0x31e
 		>;
 	};
 
+	pinctrl_sai1: sai1grp {
+		fsl,pins = <
+			MX93_PAD_SAI1_TXC__SAI1_TX_BCLK		0x31e
+			MX93_PAD_SAI1_TXFS__SAI1_TX_SYNC	0x31e
+			MX93_PAD_SAI1_TXD0__SAI1_TX_DATA00	0x31e
+			MX93_PAD_SAI1_RXD0__SAI1_RX_DATA00	0x31e
+			MX93_PAD_I2C2_SDA__SAI1_RX_BCLK		0x31e
+			MX93_PAD_I2C2_SCL__SAI1_RX_SYNC		0x31e
+			MX93_PAD_UART2_RXD__SAI1_MCLK		0x31e
+		>;
+	};
+
+	pinctrl_sai1_sleep: sai1-sleepgrp {
+		fsl,pins = <
+			MX93_PAD_SAI1_TXC__GPIO1_IO12		0x31e
+			MX93_PAD_SAI1_TXFS__GPIO1_IO11		0x31e
+			MX93_PAD_SAI1_TXD0__GPIO1_IO13		0x31e
+			MX93_PAD_SAI1_RXD0__GPIO1_IO14		0x31e
+			MX93_PAD_UART2_RXD__GPIO1_IO06		0x31e
+			MX93_PAD_I2C2_SDA__GPIO1_IO03		0x31e
+			MX93_PAD_I2C2_SCL__GPIO1_IO02		0x31e
+		>;
+	};
+
 	pinctrl_usdhc1: usdhc1grp {
 		fsl,pins = <
 			MX93_PAD_SD1_CLK__USDHC1_CLK		0x15fe
-- 
2.43.0