linux-kernel - [PATCH v1 2/3] arm64: dts: ti: var-som-am62p: Add support for WM8904 audio codec

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Message-ID: <20251003125031.30539-3-stefano.radaelli21@gmail.com>
Date: Fri,  3 Oct 2025 14:50:28 +0200
From: Stefano Radaelli <stefano.radaelli21@...il.com>
To: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Stefano Radaelli <stefano.radaelli21@...il.com>,
	Nishanth Menon <nm@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Tero Kristo <kristo@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v1 2/3] arm64: dts: ti: var-som-am62p: Add support for WM8904 audio codec

The VAR-SOM-AM62P 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 McASP1 peripheral, and introduces the sound node to expose the
sound card to the system.

Signed-off-by: Stefano Radaelli <stefano.radaelli21@...il.com>
---
 arch/arm64/boot/dts/ti/k3-am62p5-var-som.dtsi | 72 +++++++++++++++++++
 1 file changed, 72 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62p5-var-som.dtsi b/arch/arm64/boot/dts/ti/k3-am62p5-var-som.dtsi
index b93372f22732..aba72d0b767c 100644
--- a/arch/arm64/boot/dts/ti/k3-am62p5-var-som.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62p5-var-som.dtsi
@@ -112,6 +112,38 @@ reg_3v3_phy: regulator-3v3-phy {
 		enable-active-high;
 		regulator-always-on;
 	};
+
+	sound {
+		compatible = "simple-audio-card";
+		simple-audio-card,bitclock-master = <&codec_dai>;
+		simple-audio-card,format = "dsp_b";
+		simple-audio-card,frame-master = <&codec_dai>;
+		simple-audio-card,name = "wm8904-audio";
+		simple-audio-card,mclk-fs = <256>;
+		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 = <&mcasp1>;
+		};
+	};
+};
+
+&audio_refclk1 {
+	assigned-clock-rates = <100000000>;
 };
 
 &cpsw3g {
@@ -149,6 +181,19 @@ &main_i2c2 {
 	pinctrl-0 = <&pinctrl_i2c2>;
 	clock-frequency = <400000>;
 	status = "okay";
+
+	wm8904: audio-codec@1a {
+		compatible = "wlf,wm8904";
+		reg = <0x1a>;
+		#sound-dai-cells = <0>;
+		clocks = <&audio_refclk1>;
+		clock-names = "mclk";
+		AVDD-supply = <&reg_1v8>;
+		CPVDD-supply = <&reg_1v8>;
+		DBVDD-supply = <&reg_3v3>;
+		DCVDD-supply = <&reg_1v8>;
+		MICVDD-supply = <&reg_1v8>;
+	};
 };
 
 &main_i2c3 {
@@ -179,6 +224,16 @@ AM62PX_IOPAD(0x01d4, PIN_INPUT_PULLUP, 2) /* (C22) UART0_RTSn.I2C3_SDA */
 		>;
 	};
 
+	pinctrl_mcasp1: main-mcasp1-default-pins {
+		pinctrl-single,pins = <
+			AM62PX_IOPAD(0x0090, PIN_INPUT, 2) /* (U24) GPMC0_BE0n_CLE.MCASP1_ACLKX */
+			AM62PX_IOPAD(0x0098, PIN_INPUT, 2) /* (AA24) GPMC0_WAIT0.MCASP1_AFSX */
+			AM62PX_IOPAD(0x008c, PIN_OUTPUT, 2) /* (T25) GPMC0_WEn.MCASP1_AXR0 */
+			AM62PX_IOPAD(0x0084, PIN_INPUT, 2) /* (R25) GPMC0_ADVn_ALE.MCASP1_AXR2 */
+			AM62PX_IOPAD(0x00a0, PIN_OUTPUT, 1) /* (P24) GPMC0_WPn.AUDIO_EXT_REFCLK1 */
+		>;
+	};
+
 	pinctrl_mdio1: main-mdio1-default-pins {
 		pinctrl-single,pins = <
 			AM62PX_IOPAD(0x0160, PIN_OUTPUT, 0) /* (F17) MDIO0_MDC */
@@ -280,6 +335,23 @@ bluetooth {
 	};
 };
 
+&mcasp1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_mcasp1>;
+	op-mode = <0>;  /* MCASP_IIS_MODE */
+	serial-dir = <  /* 0: INACTIVE, 1: TX, 2: RX */
+		1 0 2 0
+		0 0 0 0
+		0 0 0 0
+		0 0 0 0
+	>;
+	tdm-slots = <2>;
+	tx-num-evt = <0>;
+	rx-num-evt = <0>;
+	#sound-dai-cells = <0>;
+	status = "okay";
+};
+
 &sdhci0 {
 	/* On-module eMMC */
 	ti,driver-strength-ohm = <50>;
-- 
2.47.3