linux-kernel - [PATCH 2/3] ARM: dts: imx28-amarula-rmm: add I2S audio

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Message-ID: <20250924101640.2942635-2-dario.binacchi@amarulasolutions.com>
Date: Wed, 24 Sep 2025 12:16:26 +0200
From: Dario Binacchi <dario.binacchi@...rulasolutions.com>
To: linux-kernel@...r.kernel.org
Cc: linux-amarula@...rulasolutions.com,
	Dario Binacchi <dario.binacchi@...rulasolutions.com>,
	Michael Trimarchi <michael@...rulasolutions.com>,
	Conor Dooley <conor+dt@...nel.org>,
	Fabio Estevam <festevam@...il.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Rob Herring <robh@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 2/3] ARM: dts: imx28-amarula-rmm: add I2S audio

Add support for I2S audio on Amarula rmm board. Audio codec
TLV320AIC3X is connected as slave to SAIF0, which provides
bitclock, frame and MCLK.

Co-developed-by: Michael Trimarchi <michael@...rulasolutions.com>
Signed-off-by: Michael Trimarchi <michael@...rulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
---

 .../boot/dts/nxp/mxs/imx28-amarula-rmm.dts    | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/arch/arm/boot/dts/nxp/mxs/imx28-amarula-rmm.dts b/arch/arm/boot/dts/nxp/mxs/imx28-amarula-rmm.dts
index af59211842fb..0c5b52f67178 100644
--- a/arch/arm/boot/dts/nxp/mxs/imx28-amarula-rmm.dts
+++ b/arch/arm/boot/dts/nxp/mxs/imx28-amarula-rmm.dts
@@ -112,6 +112,29 @@ reg_usb1_vbus: regulator-usb1-vbus {
 		enable-active-high;
 		regulator-always-on;
 	};
+
+	sound {
+		compatible = "simple-audio-card";
+		simple-audio-card,name = "imx28-mrmmi-tlv320aic3x-audio";
+		simple-audio-card,format = "i2s";
+		simple-audio-card,bitclock-master = <&cpu_dai>;
+		simple-audio-card,frame-master = <&cpu_dai>;
+		simple-audio-card,widgets =
+			"Headphone", "Headphone Jack";
+		simple-audio-card,routing =
+			"Headphone Jack", "HPROUT",
+			"Headphone Jack", "HPRCOM";
+		simple-audio-card,mclk-fs = <512>;
+
+		cpu_dai: simple-audio-card,cpu {
+			sound-dai = <&saif0>;
+			clocks = <&saif0>;
+		};
+
+		codec_dai: simple-audio-card,codec {
+			sound-dai = <&tlv320aic3x>;
+		};
+	};
 };
 
 &auart0 {
@@ -154,6 +177,20 @@ &i2c0 {
 	pinctrl-0 = <&i2c0_pins_a>;
 	status = "okay";
 
+	tlv320aic3x: tlv320aic3x@18 {
+		compatible = "ti,tlv320aic3x";
+		pinctrl-names = "default";
+		pinctrl-0 = <&tlv320aic3x_pins>;
+		reg = <0x18>;
+		reset-gpios = <&gpio2 4 GPIO_ACTIVE_LOW>;
+		#sound-dai-cells = <0>;
+
+		DVDD-supply = <&reg_1v8>;
+		IOVDD-supply = <&reg_3v3>;
+		AVDD-supply = <&reg_3v3>;
+		DRVDD-supply = <&reg_3v3>;
+	};
+
 	touchscreen: touchscreen@38 {
 		compatible = "edt,edt-ft5306";
 		reg = <0x38>;
@@ -246,6 +283,14 @@ MX28_PAD_PWM1__GPIO_3_17
 		fsl,voltage = <MXS_VOLTAGE_HIGH>;
 	};
 
+	tlv320aic3x_pins: tlv320aic3x-pins@0 {
+		reg = <0>;
+		fsl,pinmux-ids = <MX28_PAD_SSP0_DATA4__GPIO_2_4>;
+		fsl,drive-strength = <MXS_DRIVE_4mA>;
+		fsl,pull-up = <MXS_PULL_ENABLE>;
+		fsl,voltage = <MXS_VOLTAGE_HIGH>;
+	};
+
 	usb0_vbus_enable_pin: usb0-vbus-enable@0 {
 		reg = <0>;
 		fsl,pinmux-ids = <MX28_PAD_SSP0_DATA5__GPIO_2_5>;
@@ -269,6 +314,12 @@ &pwm {
 	status = "okay";
 };
 
+&saif0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&saif0_pins_a>;
+	status = "okay";
+};
+
 /* microSD */
 &ssp0 {
 	compatible = "fsl,imx28-mmc";
-- 
2.43.0

base-commit: cec1e6e5d1ab33403b809f79cd20d6aff124ccfe
branch: microgea-rmm-audio