[PATCH v1 04/11] ARM: dts: imx6ul: Add Variscite audio codec files

Stefano Radaelli stefano.radaelli21 at gmail.com
Fri Sep 25 07:02:21 PDT 2026 

From: Stefano Radaelli <stefano.r at variscite.com>

Add separate DTSI files for the WM8904 and WM8731 audio options on
VAR-SOM-6UL and DART-6UL modules.

Put each codec node, the SAI2 setup and its pinctrl in the selected
audio DTSI. This makes the WM8904 option explicit instead of placing
it in the shared module base.

Signed-off-by: Stefano Radaelli <stefano.r at variscite.com>
---
 .../imx/imx6ul-imx6ull-var-dart-wm8731.dtsi   | 71 +++++++++++++++
 .../imx/imx6ul-imx6ull-var-dart-wm8904.dtsi   | 88 +++++++++++++++++++
 .../imx/imx6ul-imx6ull-var-som-wm8731.dtsi    | 71 +++++++++++++++
 .../imx/imx6ul-imx6ull-var-som-wm8904.dtsi    | 85 ++++++++++++++++++
 4 files changed, 315 insertions(+)
 create mode 100644 arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-dart-wm8731.dtsi
 create mode 100644 arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-dart-wm8904.dtsi
 create mode 100644 arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-som-wm8731.dtsi
 create mode 100644 arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-som-wm8904.dtsi

diff --git a/arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-dart-wm8731.dtsi b/arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-dart-wm8731.dtsi
new file mode 100644
index 000000000000..7d74fc3b7014
--- /dev/null
+++ b/arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-dart-wm8731.dtsi
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2026 Variscite Ltd. - https://www.variscite.com
+ */
+
+/ {
+	sound {
+		compatible = "simple-audio-card";
+		simple-audio-card,bitclock-master = <&sound_master>;
+		simple-audio-card,format = "i2s";
+		simple-audio-card,frame-master = <&sound_master>;
+		simple-audio-card,name = "wm8731audio";
+		simple-audio-card,routing =
+			"Headphone Jack", "RHPOUT",
+			"Headphone Jack", "LHPOUT",
+			"LLINEIN", "Line Jack",
+			"RLINEIN", "Line Jack",
+			"MICIN", "Mic Bias",
+			"Mic Bias", "Mic Jack";
+		simple-audio-card,widgets =
+			"Headphone", "Headphone Jack",
+			"Line", "Line Jack",
+			"Microphone", "Mic Jack";
+
+		sound_master: simple-audio-card,cpu {
+			sound-dai = <&sai2>;
+		};
+
+		simple-audio-card,codec {
+			sound-dai = <&codec>;
+			system-clock-frequency = <12288000>;
+		};
+	};
+};
+
+&i2c2 {
+	codec: audio-codec at 1a {
+		compatible = "wlf,wm8731";
+		reg = <0x1a>;
+		#sound-dai-cells = <0>;
+		clocks = <&clks IMX6UL_CLK_SAI2>;
+		clock-names = "mclk";
+		AVDD-supply = <&reg_3p3v>;
+		DBVDD-supply = <&reg_3p3v>;
+		DCVDD-supply = <&reg_3p3v>;
+		HPVDD-supply = <&reg_3p3v>;
+	};
+};
+
+&sai2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_sai2>;
+	assigned-clocks = <&clks IMX6UL_CLK_SAI2_SEL>,
+			  <&clks IMX6UL_CLK_SAI2>;
+	assigned-clock-parents = <&clks IMX6UL_CLK_PLL4_AUDIO_DIV>;
+	assigned-clock-rates = <0>, <12288000>;
+	fsl,sai-mclk-direction-output;
+	status = "okay";
+};
+
+&iomuxc {
+	pinctrl_sai2: sai2-grp {
+		fsl,pins = <
+			MX6UL_PAD_JTAG_TDI__SAI2_TX_BCLK	0x17088
+			MX6UL_PAD_JTAG_TDO__SAI2_TX_SYNC	0x17088
+			MX6UL_PAD_JTAG_TRST_B__SAI2_TX_DATA	0x11088
+			MX6UL_PAD_JTAG_TCK__SAI2_RX_DATA	0x11088
+			MX6UL_PAD_JTAG_TMS__SAI2_MCLK		0x17088
+		>;
+	};
+};
diff --git a/arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-dart-wm8904.dtsi b/arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-dart-wm8904.dtsi
new file mode 100644
index 000000000000..1e1ff8c6d7b5
--- /dev/null
+++ b/arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-dart-wm8904.dtsi
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2026 Variscite Ltd. - https://www.variscite.com
+ */
+
+/ {
+	sound {
+		compatible = "simple-audio-card";
+		simple-audio-card,bitclock-master = <&sound_master>;
+		simple-audio-card,format = "i2s";
+		simple-audio-card,frame-master = <&sound_master>;
+		simple-audio-card,name = "wm8904audio";
+		simple-audio-card,routing =
+			"Headphone Jack", "HPOUTL",
+			"Headphone Jack", "HPOUTR",
+			"IN1L", "Line In Jack",
+			"IN1R", "Line In Jack",
+			"IN2L", "Microphone Jack",
+			"IN2R", "Microphone Jack",
+			"Microphone Jack", "MICBIAS";
+		simple-audio-card,widgets =
+			"Microphone", "Microphone Jack",
+			"Headphone", "Headphone Jack",
+			"Line", "Line In Jack";
+		simple-audio-card,mclk-fs = <256>;
+
+		simple-audio-card,cpu {
+			sound-dai = <&sai2>;
+		};
+
+		sound_master: simple-audio-card,codec {
+			sound-dai = <&codec>;
+		};
+	};
+};
+
+&i2c2 {
+	codec: audio-codec at 1a {
+		compatible = "wlf,wm8904";
+		reg = <0x1a>;
+		#sound-dai-cells = <0>;
+		clocks = <&clks IMX6UL_CLK_SAI2>;
+		clock-names = "mclk";
+		AVDD-supply = <&reg_3p3v>;
+		CPVDD-supply = <&reg_3p3v>;
+		DBVDD-supply = <&reg_3p3v>;
+		DCVDD-supply = <&reg_3p3v>;
+		MICVDD-supply = <&reg_3p3v>;
+		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>;
+	};
+};
+
+&sai2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_sai2>;
+	assigned-clocks = <&clks IMX6UL_CLK_SAI2_SEL>,
+			  <&clks IMX6UL_CLK_SAI2>;
+	assigned-clock-parents = <&clks IMX6UL_CLK_PLL4_AUDIO_DIV>;
+	assigned-clock-rates = <0>, <11565177>;
+	fsl,sai-mclk-direction-output;
+	status = "okay";
+};
+
+&iomuxc {
+	pinctrl_sai2: sai2-grp {
+		fsl,pins = <
+			MX6UL_PAD_JTAG_TDI__SAI2_TX_BCLK	0x17088
+			MX6UL_PAD_JTAG_TDO__SAI2_TX_SYNC	0x17088
+			MX6UL_PAD_JTAG_TRST_B__SAI2_TX_DATA	0x11088
+			MX6UL_PAD_JTAG_TCK__SAI2_RX_DATA	0x11088
+			MX6UL_PAD_JTAG_TMS__SAI2_MCLK		0x17088
+		>;
+	};
+};
diff --git a/arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-som-wm8731.dtsi b/arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-som-wm8731.dtsi
new file mode 100644
index 000000000000..7d74fc3b7014
--- /dev/null
+++ b/arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-som-wm8731.dtsi
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2026 Variscite Ltd. - https://www.variscite.com
+ */
+
+/ {
+	sound {
+		compatible = "simple-audio-card";
+		simple-audio-card,bitclock-master = <&sound_master>;
+		simple-audio-card,format = "i2s";
+		simple-audio-card,frame-master = <&sound_master>;
+		simple-audio-card,name = "wm8731audio";
+		simple-audio-card,routing =
+			"Headphone Jack", "RHPOUT",
+			"Headphone Jack", "LHPOUT",
+			"LLINEIN", "Line Jack",
+			"RLINEIN", "Line Jack",
+			"MICIN", "Mic Bias",
+			"Mic Bias", "Mic Jack";
+		simple-audio-card,widgets =
+			"Headphone", "Headphone Jack",
+			"Line", "Line Jack",
+			"Microphone", "Mic Jack";
+
+		sound_master: simple-audio-card,cpu {
+			sound-dai = <&sai2>;
+		};
+
+		simple-audio-card,codec {
+			sound-dai = <&codec>;
+			system-clock-frequency = <12288000>;
+		};
+	};
+};
+
+&i2c2 {
+	codec: audio-codec at 1a {
+		compatible = "wlf,wm8731";
+		reg = <0x1a>;
+		#sound-dai-cells = <0>;
+		clocks = <&clks IMX6UL_CLK_SAI2>;
+		clock-names = "mclk";
+		AVDD-supply = <&reg_3p3v>;
+		DBVDD-supply = <&reg_3p3v>;
+		DCVDD-supply = <&reg_3p3v>;
+		HPVDD-supply = <&reg_3p3v>;
+	};
+};
+
+&sai2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_sai2>;
+	assigned-clocks = <&clks IMX6UL_CLK_SAI2_SEL>,
+			  <&clks IMX6UL_CLK_SAI2>;
+	assigned-clock-parents = <&clks IMX6UL_CLK_PLL4_AUDIO_DIV>;
+	assigned-clock-rates = <0>, <12288000>;
+	fsl,sai-mclk-direction-output;
+	status = "okay";
+};
+
+&iomuxc {
+	pinctrl_sai2: sai2-grp {
+		fsl,pins = <
+			MX6UL_PAD_JTAG_TDI__SAI2_TX_BCLK	0x17088
+			MX6UL_PAD_JTAG_TDO__SAI2_TX_SYNC	0x17088
+			MX6UL_PAD_JTAG_TRST_B__SAI2_TX_DATA	0x11088
+			MX6UL_PAD_JTAG_TCK__SAI2_RX_DATA	0x11088
+			MX6UL_PAD_JTAG_TMS__SAI2_MCLK		0x17088
+		>;
+	};
+};
diff --git a/arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-som-wm8904.dtsi b/arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-som-wm8904.dtsi
new file mode 100644
index 000000000000..72a73011af6f
--- /dev/null
+++ b/arch/arm/boot/dts/nxp/imx/imx6ul-imx6ull-var-som-wm8904.dtsi
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2026 Variscite Ltd. - https://www.variscite.com
+ */
+
+/ {
+	sound {
+		compatible = "simple-audio-card";
+		simple-audio-card,bitclock-master = <&sound_master>;
+		simple-audio-card,format = "i2s";
+		simple-audio-card,frame-master = <&sound_master>;
+		simple-audio-card,name = "wm8904audio";
+		simple-audio-card,routing =
+			"Headphone Jack", "HPOUTL",
+			"Headphone Jack", "HPOUTR",
+			"IN1L", "Line In Jack",
+			"IN1R", "Line In Jack";
+		simple-audio-card,widgets =
+			"Microphone", "Microphone Jack",
+			"Headphone", "Headphone Jack",
+			"Line", "Line In Jack";
+		simple-audio-card,mclk-fs = <256>;
+
+		simple-audio-card,cpu {
+			sound-dai = <&sai2>;
+		};
+
+		sound_master: simple-audio-card,codec {
+			sound-dai = <&codec>;
+		};
+	};
+};
+
+&i2c2 {
+	codec: audio-codec at 1a {
+		compatible = "wlf,wm8904";
+		reg = <0x1a>;
+		#sound-dai-cells = <0>;
+		clocks = <&clks IMX6UL_CLK_SAI2>;
+		clock-names = "mclk";
+		AVDD-supply = <&reg_3p3v>;
+		CPVDD-supply = <&reg_3p3v>;
+		DBVDD-supply = <&reg_3p3v>;
+		DCVDD-supply = <&reg_3p3v>;
+		MICVDD-supply = <&reg_3p3v>;
+		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>;
+	};
+};
+
+&sai2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_sai2>;
+	assigned-clocks = <&clks IMX6UL_CLK_SAI2_SEL>,
+			  <&clks IMX6UL_CLK_SAI2>;
+	assigned-clock-parents = <&clks IMX6UL_CLK_PLL4_AUDIO_DIV>;
+	assigned-clock-rates = <0>, <11565177>;
+	fsl,sai-mclk-direction-output;
+	status = "okay";
+};
+
+&iomuxc {
+	pinctrl_sai2: sai2-grp {
+		fsl,pins = <
+			MX6UL_PAD_JTAG_TDI__SAI2_TX_BCLK	0x17088
+			MX6UL_PAD_JTAG_TDO__SAI2_TX_SYNC	0x17088
+			MX6UL_PAD_JTAG_TRST_B__SAI2_TX_DATA	0x11088
+			MX6UL_PAD_JTAG_TCK__SAI2_RX_DATA	0x11088
+			MX6UL_PAD_JTAG_TMS__SAI2_MCLK		0x17088
+		>;
+	};
+};
-- 
2.47.3

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