[PATCH v1 04/11] arm64: dts: imx8mm-var-som: Add support for WM8904 audio codec

[Stefano Radaelli]

From: Stefano Radaelli <stefano.r@xxxxxxxxxxxxx>

The VAR-SOM-MX8MM 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.r@xxxxxxxxxxxxx>
---
 .../boot/dts/freescale/imx8mm-var-som.dtsi    | 101 +++++++++++++++++-
 1 file changed, 98 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-var-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-var-som.dtsi
index 23045f54e00e..e52080490ddf 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-var-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-var-som.dtsi
@@ -15,6 +15,14 @@ memory@40000000 {
 		reg = <0x0 0x40000000 0 0x80000000>;
 	};
 
+	reg_audio_supply: regulator-3p3v {
+		compatible = "regulator-fixed";
+		regulator-name = "wm8904-supply";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
+
 	reg_eth_phy: regulator-eth-phy {
 		compatible = "regulator-fixed";
 		pinctrl-names = "default";
@@ -32,6 +40,34 @@ reg_phy_vddio: regulator-phy-vddio {
 		regulator-min-microvolt = <1800000>;
 		regulator-max-microvolt = <1800000>;
 	};
+
+	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,mclk-fs = <256>;
+		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";
+
+		codec_dai: simple-audio-card,codec {
+			sound-dai = <&wm8904>;
+		};
+
+		simple-audio-card,cpu {
+			sound-dai = <&sai5>;
+		};
+	};
 };
 
 &A53_0 {
@@ -277,18 +313,58 @@ ldo6_reg: LDO6 {
 
 &i2c3 {
 	clock-frequency = <400000>;
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_i2c3>;
+	pinctrl-1 = <&pinctrl_i2c3_gpio>;
+	scl-gpios = <&gpio5 18 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio5 19 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	status = "okay";
 
-	/* TODO: configure audio, as of now just put a placeholder */
 	wm8904: codec@1a {
 		compatible = "wlf,wm8904";
 		reg = <0x1a>;
-		status = "disabled";
+		#sound-dai-cells = <0>;
+		clocks = <&clk IMX8MM_CLK_SAI5_ROOT>;
+		clock-names = "mclk";
+		AVDD-supply = <&ldo5_reg>;
+		CPVDD-supply = <&ldo5_reg>;
+		DBVDD-supply = <&reg_audio_supply>;
+		DCVDD-supply = <&ldo5_reg>;
+		MICVDD-supply = <&ldo5_reg>;
+		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>;
+		status = "okay";
 	};
 };
 
+&sai5 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_sai5>;
+	assigned-clocks = <&clk IMX8MM_CLK_SAI5>;
+	assigned-clock-parents = <&clk IMX8MM_AUDIO_PLL1_OUT>;
+	assigned-clock-rates = <1536000>;
+	#sound-dai-cells = <0>;
+	dmas = <&sdma2 8 25 0>, <&sdma2 9 25 0>;
+	dma-names = "rx", "tx";
+	fsl,sai-mclk-direction-output;
+	status = "okay";
+};
+
 &snvs_pwrkey {
 	status = "okay";
 };
@@ -433,6 +509,13 @@ MX8MM_IOMUXC_I2C3_SDA_I2C3_SDA			0x400001c3
 		>;
 	};
 
+	pinctrl_i2c3_gpio: i2c3gpiogrp {
+		fsl,pins = <
+			MX8MM_IOMUXC_I2C3_SCL_GPIO5_IO18		0x1c3
+			MX8MM_IOMUXC_I2C3_SDA_GPIO5_IO19		0x1c3
+		>;
+	};
+
 	pinctrl_pmic: pmicirqgrp {
 		fsl,pins = <
 			MX8MM_IOMUXC_SD1_DATA6_GPIO2_IO8		0x141
@@ -451,6 +534,18 @@ MX8MM_IOMUXC_GPIO1_IO03_GPIO1_IO3		0x1c0
 		>;
 	};
 
+	pinctrl_sai5: sai5grp {
+		fsl,pins = <
+			MX8MM_IOMUXC_SAI5_RXD1_SAI5_TX_SYNC		0xd6
+			MX8MM_IOMUXC_SAI5_RXFS_SAI5_RX_SYNC		0xd6
+			MX8MM_IOMUXC_SAI5_RXD3_SAI5_TX_DATA0		0xd6
+			MX8MM_IOMUXC_SAI5_RXD0_SAI5_RX_DATA0		0xd6
+			MX8MM_IOMUXC_SAI5_RXC_SAI5_RX_BCLK		0xd6
+			MX8MM_IOMUXC_SAI5_RXD2_SAI5_TX_BCLK		0xd6
+			MX8MM_IOMUXC_SAI5_MCLK_SAI5_MCLK		0xd6
+		>;
+	};
+
 	pinctrl_uart2: uart2grp {
 		fsl,pins = <
 			MX8MM_IOMUXC_SAI3_TXFS_UART2_DCE_RX		0x140
-- 
2.47.3