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Message-ID: <20251030120127.509933-4-stefano.radaelli21@gmail.com>
Date: Thu, 30 Oct 2025 13:01:23 +0100
From: Stefano Radaelli <stefano.radaelli21@...il.com>
To: devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Stefano Radaelli <stefano.radaelli21@...il.com>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
imx@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 3/4] arm64: dts: freescale: imx93-var-som: Add support for WM8904 audio codec
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@...il.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
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