[PATCH v1 2/3] arm64: dts: freescale: Add support for Variscite DART-MX93

Stefano Radaelli
2026-03-26T15:48:30Z

Add device tree support for the Variscite DART-MX93 system on module.
This SOM is designed to be used with various carrier boards.

The module includes:
- NXP i.MX93 MPU processor
- Up to 2GB of LPDDR4 memory
- Up to 128GB of eMMC storage memory
- Integrated 10/100/1000 Mbps Ethernet Transceiver
- Codec audio WM8904
- WIFI6 dual-band 802.11ax/ac/a/b/g/n with optional 802.15.4 and Bluetooth

Only SOM-specific peripherals are enabled by default. Carrier board
specific interfaces are left disabled to be enabled in the respective
carrier board device trees.

Link: https://variscite.com/system-on-module-som/i-mx-9/i-mx-93/dart-mx93/
Signed-off-by: Stefano Radaelli <stefano.r@variscite.com>
---
.../boot/dts/freescale/imx93-var-dart.dtsi | 462 ++++++++++++++++++
1 file changed, 462 insertions(+)
create mode 100644 arch/arm64/boot/dts/freescale/imx93-var-dart.dtsi

diff --git a/arch/arm64/boot/dts/freescale/imx93-var-dart.dtsi b/arch/arm64/boot/dts/freescale/imx93-var-dart.dtsi
new file mode 100644
index 000000000000..bfed6625f5ab
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx93-var-dart.dtsi
@@ -0,0 +1,462 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Common dtsi for Variscite DART-MX93
+ *
+ * Link: https://variscite.com/system-on-module-som/i-mx-9/i-mx-93/dart-mx93/
+ *
+ * Copyright (C) 2026 Variscite Ltd. - https://www.variscite.com/
+ *
+ */
+
+/dts-v1/;
+
+#include <dt-bindings/usb/pd.h>
+#include "imx93.dtsi"
+
+/ {
+ model = "Variscite DART-MX93 Module";
+ compatible = "variscite,var-dart-mx93", "fsl,imx93";
+
+ sound-wm8904 {
+ 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 = <&sai1>;
+ };
+ };
+
+ wifi_pwrseq: wifi-pwrseq {
+ compatible = "mmc-pwrseq-simple";
+ post-power-on-delay-ms = <100>;
+ power-off-delay-us = <10000>;
+ reset-gpios = <&gpio4 14 GPIO_ACTIVE_LOW>, /* WIFI_RESET */
+ <&gpio3 7 GPIO_ACTIVE_LOW>; /* WIFI_PWR_EN */
+ };
+};
+
+&cm33 {
+ mbox-names = "tx", "rx", "rxdb";
+ mboxes = <&mu1 0 1>,
+ <&mu1 1 1>,
+ <&mu1 3 1>;
+ memory-region = <&vdevbuffer>, <&vdev0vring0>, <&vdev0vring1>,
+ <&vdev1vring0>, <&vdev1vring1>, <&rsc_table>;
+ status = "okay";
+};
+
+&eqos {
+ pinctrl-names = "default", "sleep";
+ pinctrl-0 = <&pinctrl_eqos>;
+ pinctrl-1 = <&pinctrl_eqos_sleep>;
+ /*
+ * The required RGMII TX and RX 2ns delays are implemented directly
+ * in hardware via passive delay elements on the SOM PCB.
+ * No delay configuration is needed in software via PHY driver.
+ */
+ phy-mode = "rgmii";
+ phy-handle = <&ethphy0>;
+ snps,clk-csr = <5>;
+ status = "okay";
+
+ mdio {
+ compatible = "snps,dwmac-mdio";
+ clock-frequency = <1000000>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ ethphy0: ethernet-phy@0 {
+ compatible = "ethernet-phy-ieee802.3-c22";
+ reg = <0>;
+ reset-gpios = <&gpio1 7 GPIO_ACTIVE_LOW>;
+ reset-assert-us = <10000>;
+ reset-deassert-us = <100000>;
+ };
+ };
+};
+
+&lpi2c3 {
+ clock-frequency = <400000>;
+ pinctrl-names = "default", "sleep", "gpio";
+ pinctrl-0 = <&pinctrl_lpi2c3>;
+ pinctrl-1 = <&pinctrl_lpi2c3_gpio>;
+ pinctrl-2 = <&pinctrl_lpi2c3_gpio>;
+ scl-gpios = <&gpio2 29 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+ sda-gpios = <&gpio2 28 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+ status = "okay";
+
+ 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>;
+ /* DMIC is connected to IN1L */
+ wlf,in1l-as-dmicdat1;
+ };
+
+ pmic@25 {
+ compatible = "nxp,pca9451a";
+ reg = <0x25>;
+
+ regulators {
+ buck1: BUCK1 {
+ regulator-name = "BUCK1";
+ regulator-min-microvolt = <650000>;
+ regulator-max-microvolt = <2237500>;
+ regulator-boot-on;
+ regulator-always-on;
+ regulator-ramp-delay = <3125>;
+ };
+
+ buck2: BUCK2 {
+ regulator-name = "BUCK2";
+ regulator-min-microvolt = <600000>;
+ regulator-max-microvolt = <2187500>;
+ regulator-boot-on;
+ regulator-always-on;
+ regulator-ramp-delay = <3125>;
+ };
+
+ buck4: BUCK4 {
+ regulator-name = "BUCK4";
+ regulator-min-microvolt = <600000>;
+ regulator-max-microvolt = <3400000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ buck5: BUCK5 {
+ regulator-name = "BUCK5";
+ regulator-min-microvolt = <600000>;
+ regulator-max-microvolt = <3400000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ buck6: BUCK6 {
+ regulator-name = "BUCK6";
+ regulator-min-microvolt = <600000>;
+ regulator-max-microvolt = <3400000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ ldo1: LDO1 {
+ regulator-name = "LDO1";
+ regulator-min-microvolt = <1600000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ ldo4: LDO4 {
+ regulator-name = "LDO4";
+ regulator-min-microvolt = <800000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ ldo5: LDO5 {
+ regulator-name = "LDO5";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+ };
+ };
+};
+
+/* BT module */
+&lpuart5 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_uart5>, <&pinctrl_bt>;
+ uart-has-rtscts;
+ status = "okay";
+
+ bluetooth {
+ compatible = "nxp,88w8987-bt";
+ };
+};
+
+&mu1 {
+ status = "okay";
+};
+
+&mu2 {
+ status = "okay";
+};
+
+&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>;
+ #sound-dai-cells = <0>;
+ fsl,sai-mclk-direction-output;
+ status = "okay";
+};
+
+/* eMMC */
+&usdhc1 {
+ pinctrl-names = "default", "state_100mhz", "state_200mhz";
+ pinctrl-0 = <&pinctrl_usdhc1>;
+ pinctrl-1 = <&pinctrl_usdhc1_100mhz>;
+ pinctrl-2 = <&pinctrl_usdhc1_200mhz>;
+ bus-width = <8>;
+ non-removable;
+ status = "okay";
+};
+
+/* WiFi */
+&usdhc3 {
+ pinctrl-names = "default", "state_100mhz", "state_200mhz", "sleep";
+ pinctrl-0 = <&pinctrl_usdhc3>, <&pinctrl_usdhc3_wlan>;
+ pinctrl-1 = <&pinctrl_usdhc3_100mhz>, <&pinctrl_usdhc3_wlan>;
+ pinctrl-2 = <&pinctrl_usdhc3_200mhz>, <&pinctrl_usdhc3_wlan>;
+ pinctrl-3 = <&pinctrl_usdhc3_sleep>, <&pinctrl_usdhc3_wlan>;
+ mmc-pwrseq = <&wifi_pwrseq>;
+ keep-power-in-suspend;
+ bus-width = <4>;
+ non-removable;
+ wakeup-source;
+ status = "okay";
+};
+
+&iomuxc {
+ pinctrl_bt: btgrp {
+ fsl,pins = <
+ MX93_PAD_ENET2_MDIO__GPIO4_IO15 0x51e
+ >;
+ };
+
+ pinctrl_eqos: eqosgrp {
+ fsl,pins = <
+ MX93_PAD_ENET1_MDC__ENET_QOS_MDC 0x57e
+ MX93_PAD_ENET1_MDIO__ENET_QOS_MDIO 0x57e
+ MX93_PAD_ENET1_RD0__ENET_QOS_RGMII_RD0 0x57e
+ MX93_PAD_ENET1_RD1__ENET_QOS_RGMII_RD1 0x57e
+ MX93_PAD_ENET1_RD2__ENET_QOS_RGMII_RD2 0x57e
+ MX93_PAD_ENET1_RD3__ENET_QOS_RGMII_RD3 0x57e
+ MX93_PAD_ENET1_RXC__CCM_ENET_QOS_CLOCK_GENERATE_RX_CLK 0x58e
+ MX93_PAD_ENET1_RX_CTL__ENET_QOS_RGMII_RX_CTL 0x57e
+ MX93_PAD_ENET1_TD0__ENET_QOS_RGMII_TD0 0x57e
+ MX93_PAD_ENET1_TD1__ENET_QOS_RGMII_TD1 0x57e
+ MX93_PAD_ENET1_TD2__ENET_QOS_RGMII_TD2 0x57e
+ MX93_PAD_ENET1_TD3__ENET_QOS_RGMII_TD3 0x57e
+ MX93_PAD_ENET1_TXC__CCM_ENET_QOS_CLOCK_GENERATE_TX_CLK 0x58e
+ MX93_PAD_ENET1_TX_CTL__ENET_QOS_RGMII_TX_CTL 0x57e
+ MX93_PAD_UART2_TXD__GPIO1_IO07 0x51e
+ >;
+ };
+
+ pinctrl_eqos_sleep: eqos-sleepgrp {
+ fsl,pins = <
+ MX93_PAD_ENET1_MDC__GPIO4_IO00 0x31e
+ MX93_PAD_ENET1_MDIO__GPIO4_IO01 0x31e
+ MX93_PAD_ENET1_RD0__GPIO4_IO10 0x31e
+ MX93_PAD_ENET1_RD1__GPIO4_IO11 0x31e
+ MX93_PAD_ENET1_RD2__GPIO4_IO12 0x31e
+ MX93_PAD_ENET1_RD3__GPIO4_IO13 0x31e
+ MX93_PAD_ENET1_RXC__GPIO4_IO09 0x31e
+ MX93_PAD_ENET1_RX_CTL__GPIO4_IO08 0x31e
+ MX93_PAD_ENET1_TD0__GPIO4_IO05 0x31e
+ MX93_PAD_ENET1_TD1__GPIO4_IO04 0x31e
+ MX93_PAD_ENET1_TD2__GPIO4_IO03 0x31e
+ MX93_PAD_ENET1_TD3__GPIO4_IO02 0x31e
+ MX93_PAD_ENET1_TXC__GPIO4_IO07 0x31e
+ MX93_PAD_ENET1_TX_CTL__GPIO4_IO06 0x31e
+ >;
+ };
+
+ pinctrl_lpi2c3: lpi2c3grp {
+ fsl,pins = <
+ MX93_PAD_GPIO_IO28__LPI2C3_SDA 0x40000b9e
+ MX93_PAD_GPIO_IO29__LPI2C3_SCL 0x40000b9e
+ >;
+ };
+
+ pinctrl_lpi2c3_gpio: lpi2c3gpiogrp {
+ fsl,pins = <
+ MX93_PAD_GPIO_IO28__GPIO2_IO28 0x40000b9e
+ MX93_PAD_GPIO_IO29__GPIO2_IO29 0x40000b9e
+ >;
+ };
+
+ 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_uart5: uart5grp {
+ fsl,pins = <
+ MX93_PAD_DAP_TDO_TRACESWO__LPUART5_TX 0x31e
+ MX93_PAD_DAP_TDI__LPUART5_RX 0x31e
+ MX93_PAD_DAP_TMS_SWDIO__LPUART5_RTS_B 0x31e
+ MX93_PAD_DAP_TCLK_SWCLK__LPUART5_CTS_B 0x31e
+ >;
+ };
+
+ pinctrl_usdhc1: usdhc1grp {
+ fsl,pins = <
+ MX93_PAD_SD1_CLK__USDHC1_CLK 0x1582
+ MX93_PAD_SD1_CMD__USDHC1_CMD 0x40001382
+ MX93_PAD_SD1_DATA0__USDHC1_DATA0 0x40001382
+ MX93_PAD_SD1_DATA1__USDHC1_DATA1 0x40001382
+ MX93_PAD_SD1_DATA2__USDHC1_DATA2 0x40001382
+ MX93_PAD_SD1_DATA3__USDHC1_DATA3 0x40001382
+ MX93_PAD_SD1_DATA4__USDHC1_DATA4 0x40001382
+ MX93_PAD_SD1_DATA5__USDHC1_DATA5 0x40001382
+ MX93_PAD_SD1_DATA6__USDHC1_DATA6 0x40001382
+ MX93_PAD_SD1_DATA7__USDHC1_DATA7 0x40001382
+ MX93_PAD_SD1_STROBE__USDHC1_STROBE 0x1582
+ >;
+ };
+
+ pinctrl_usdhc1_100mhz: usdhc1-100mhzgrp {
+ fsl,pins = <
+ MX93_PAD_SD1_CLK__USDHC1_CLK 0x158e
+ MX93_PAD_SD1_CMD__USDHC1_CMD 0x4000138e
+ MX93_PAD_SD1_DATA0__USDHC1_DATA0 0x4000138e
+ MX93_PAD_SD1_DATA1__USDHC1_DATA1 0x4000138e
+ MX93_PAD_SD1_DATA2__USDHC1_DATA2 0x4000138e
+ MX93_PAD_SD1_DATA3__USDHC1_DATA3 0x4000138e
+ MX93_PAD_SD1_DATA4__USDHC1_DATA4 0x4000138e
+ MX93_PAD_SD1_DATA5__USDHC1_DATA5 0x4000138e
+ MX93_PAD_SD1_DATA6__USDHC1_DATA6 0x4000138e
+ MX93_PAD_SD1_DATA7__USDHC1_DATA7 0x4000138e
+ MX93_PAD_SD1_STROBE__USDHC1_STROBE 0x158e
+ >;
+ };
+
+ pinctrl_usdhc1_200mhz: usdhc1-200mhzgrp {
+ fsl,pins = <
+ MX93_PAD_SD1_CLK__USDHC1_CLK 0x15fe
+ MX93_PAD_SD1_CMD__USDHC1_CMD 0x400013fe
+ MX93_PAD_SD1_DATA0__USDHC1_DATA0 0x400013fe
+ MX93_PAD_SD1_DATA1__USDHC1_DATA1 0x400013fe
+ MX93_PAD_SD1_DATA2__USDHC1_DATA2 0x400013fe
+ MX93_PAD_SD1_DATA3__USDHC1_DATA3 0x400013fe
+ MX93_PAD_SD1_DATA4__USDHC1_DATA4 0x400013fe
+ MX93_PAD_SD1_DATA5__USDHC1_DATA5 0x400013fe
+ MX93_PAD_SD1_DATA6__USDHC1_DATA6 0x400013fe
+ MX93_PAD_SD1_DATA7__USDHC1_DATA7 0x400013fe
+ MX93_PAD_SD1_STROBE__USDHC1_STROBE 0x15fe
+ >;
+ };
+
+ pinctrl_usdhc3: usdhc3grp {
+ fsl,pins = <
+ MX93_PAD_SD3_CLK__USDHC3_CLK 0x1582
+ MX93_PAD_SD3_CMD__USDHC3_CMD 0x40001382
+ MX93_PAD_SD3_DATA0__USDHC3_DATA0 0x40001382
+ MX93_PAD_SD3_DATA1__USDHC3_DATA1 0x40001382
+ MX93_PAD_SD3_DATA2__USDHC3_DATA2 0x40001382
+ MX93_PAD_SD3_DATA3__USDHC3_DATA3 0x40001382
+ >;
+ };
+
+ pinctrl_usdhc3_100mhz: usdhc3-100mhzgrp {
+ fsl,pins = <
+ MX93_PAD_SD3_CLK__USDHC3_CLK 0x158e
+ MX93_PAD_SD3_CMD__USDHC3_CMD 0x4000138e
+ MX93_PAD_SD3_DATA0__USDHC3_DATA0 0x4000138e
+ MX93_PAD_SD3_DATA1__USDHC3_DATA1 0x4000138e
+ MX93_PAD_SD3_DATA2__USDHC3_DATA2 0x4000138e
+ MX93_PAD_SD3_DATA3__USDHC3_DATA3 0x4000138e
+ >;
+ };
+
+ pinctrl_usdhc3_200mhz: usdhc3-200mhzgrp {
+ fsl,pins = <
+ MX93_PAD_SD3_CLK__USDHC3_CLK 0x15fe
+ MX93_PAD_SD3_CMD__USDHC3_CMD 0x400013fe
+ MX93_PAD_SD3_DATA0__USDHC3_DATA0 0x400013fe
+ MX93_PAD_SD3_DATA1__USDHC3_DATA1 0x400013fe
+ MX93_PAD_SD3_DATA2__USDHC3_DATA2 0x400013fe
+ MX93_PAD_SD3_DATA3__USDHC3_DATA3 0x400013fe
+ >;
+ };
+
+ pinctrl_usdhc3_sleep: usdhc3-sleepgrp {
+ fsl,pins = <
+ MX93_PAD_SD3_CLK__GPIO3_IO20 0x400
+ MX93_PAD_SD3_CMD__GPIO3_IO21 0x400
+ MX93_PAD_SD3_DATA0__GPIO3_IO22 0x400
+ MX93_PAD_SD3_DATA1__GPIO3_IO23 0x400
+ MX93_PAD_SD3_DATA2__GPIO3_IO24 0x400
+ MX93_PAD_SD3_DATA3__GPIO3_IO25 0x400
+ >;
+ };
+
+ pinctrl_usdhc3_wlan: usdhc3wlangrp {
+ fsl,pins = <
+ MX93_PAD_ENET2_MDC__GPIO4_IO14 0x51e
+ MX93_PAD_SD2_RESET_B__GPIO3_IO07 0x51e
+ >;
+ };
+};
--
2.47.3