[PATCH v1 3/3] arm64: dts: imx91-var-som: Add support for Variscite Symphony board

From: Stefano Radaelli

Date: Wed Apr 08 2026 - 13:41:00 EST

From: Stefano Radaelli <stefano.r@xxxxxxxxxxxxx>

Add device tree support for the Variscite Symphony carrier board with
the VAR-SOM-MX91 system on module.

The Symphony board includes
- uSD Card support
- USB ports and OTG
- Additional Gigabit Ethernet interface
- Uart, ADC and I2C interfaces
- GPIO Expanders
- RTC module
- TPM module
- CAN peripheral

Link: https://variscite.com/carrier-boards/symphony-board/
Signed-off-by: Stefano Radaelli <stefano.r@xxxxxxxxxxxxx>
---
arch/arm64/boot/dts/freescale/Makefile | 1 +
.../dts/freescale/imx91-var-som-symphony.dts | 527 ++++++++++++++++++
2 files changed, 528 insertions(+)
create mode 100644 arch/arm64/boot/dts/freescale/imx91-var-som-symphony.dts

diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index 711e36cc2c99..646176ff95c9 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -449,6 +449,7 @@ imx91-tqma9131-mba91xxca-rgb-cdtech-dc44-dtbs := imx91-tqma9131-mba91xxca.dtb im
dtb-$(CONFIG_ARCH_MXC) += imx91-tqma9131-mba91xxca-lvds-tm070jvhg33.dtb
dtb-$(CONFIG_ARCH_MXC) += imx91-tqma9131-mba91xxca-rgb-cdtech-dc44.dtb
dtb-$(CONFIG_ARCH_MXC) += imx91-var-dart-sonata.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx91-var-som-symphony.dtb

dtb-$(CONFIG_ARCH_MXC) += imx93-9x9-qsb.dtb

diff --git a/arch/arm64/boot/dts/freescale/imx91-var-som-symphony.dts b/arch/arm64/boot/dts/freescale/imx91-var-som-symphony.dts
new file mode 100644
index 000000000000..ac9fed58357e
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx91-var-som-symphony.dts
@@ -0,0 +1,527 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Variscite Symphony carrier board for VAR-SOM-MX91
+ *
+ * Link: https://variscite.com/carrier-boards/symphony-board/
+ *
+ * Copyright (C) 2026 Variscite Ltd. - https://www.variscite.com/
+ *
+ */
+
+/dts-v1/;
+
+#include <dt-bindings/leds/common.h>
+#include "imx91-var-som.dtsi"
+
+/{
+ model = "Variscite VAR-SOM-MX91 on Symphony evaluation board";
+ compatible = "variscite,var-som-mx91-symphony",
+ "variscite,var-som-mx91", "fsl,imx91";
+
+ aliases {
+ ethernet0 = &eqos;
+ ethernet1 = &fec;
+ gpio0 = &gpio1;
+ gpio1 = &gpio2;
+ gpio2 = &gpio3;
+ gpio3 = &gpio4;
+ gpio4 = &pca9534;
+ gpio5 = &pca6408;
+ i2c0 = &lpi2c1;
+ i2c1 = &lpi2c2;
+ i2c2 = &lpi2c3;
+ mmc0 = &usdhc1;
+ mmc1 = &usdhc2;
+ serial0 = &lpuart1;
+ serial1 = &lpuart2;
+ serial2 = &lpuart3;
+ serial3 = &lpuart4;
+ serial4 = &lpuart5;
+ };
+
+ chosen {
+ stdout-path = &lpuart1;
+ };
+
+ gpio-keys {
+ compatible = "gpio-keys";
+
+ key-back {
+ label = "Back";
+ gpios = <&pca9534 1 GPIO_ACTIVE_LOW>;
+ linux,code = <KEY_BACK>;
+ };
+
+ key-home {
+ label = "Home";
+ gpios = <&pca9534 2 GPIO_ACTIVE_LOW>;
+ linux,code = <KEY_HOME>;
+ };
+
+ key-menu {
+ label = "Menu";
+ gpios = <&pca9534 3 GPIO_ACTIVE_LOW>;
+ linux,code = <KEY_MENU>;
+ };
+ };
+
+ gpio-leds {
+ compatible = "gpio-leds";
+
+ led-hearthbeat {
+ function = LED_FUNCTION_STATUS;
+ color = <LED_COLOR_ID_GREEN>;
+ gpios = <&pca9534 0 GPIO_ACTIVE_HIGH>;
+ linux,default-trigger = "heartbeat";
+ };
+ };
+
+ reg_vref_1v8: regulator-adc-vref {
+ compatible = "regulator-fixed";
+ regulator-name = "vref_1v8";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ };
+
+ /*
+ * Needed only for Symphony <= v1.5
+ */
+ reg_fec_phy: regulator-fec-phy {
+ compatible = "regulator-fixed";
+ regulator-name = "fec-phy";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ regulator-enable-ramp-delay = <20000>;
+ gpio = <&pca9534 7 GPIO_ACTIVE_HIGH>;
+ enable-active-high;
+ regulator-always-on;
+ };
+
+ reg_rgb_sel: regulator-rgb-enable {
+ compatible = "regulator-fixed";
+ regulator-name = "RGBSEL";
+ gpio = <&pca9534 7 GPIO_ACTIVE_HIGH>;
+ enable-active-high;
+ };
+
+ reg_usdhc2_vmmc: regulator-usdhc2 {
+ compatible = "regulator-fixed";
+ regulator-name = "VSD_3V3";
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ gpio = <&pca6408 6 GPIO_ACTIVE_HIGH>;
+ off-on-delay-us = <20000>;
+ enable-active-high;
+ };
+
+ reserved-memory {
+ ranges;
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ ele_reserved: ele-reserved@87de0000 {
+ compatible = "shared-dma-pool";
+ reg = <0 0x87de0000 0 0x100000>;
+ no-map;
+ };
+
+ linux,cma {
+ compatible = "shared-dma-pool";
+ alloc-ranges = <0 0x80000000 0 0x40000000>;
+ reusable;
+ size = <0 0x10000000>;
+ linux,cma-default;
+ };
+ };
+};
+
+&adc1 {
+ vref-supply = <&reg_vref_1v8>;
+ status = "okay";
+};
+
+/* Use external instead of internal RTC*/
+&bbnsm_rtc {
+ status = "disabled";
+};
+
+&eqos {
+ mdio {
+ ethphy1: ethernet-phy@5 {
+ compatible = "ethernet-phy-ieee802.3-c22";
+ reg = <5>;
+ eee-broken-1000t;
+ reset-gpios = <&pca9534 5 GPIO_ACTIVE_LOW>;
+ reset-assert-us = <10000>;
+ reset-deassert-us = <20000>;
+ vddio-supply = <&vddio1>;
+
+ leds {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ led@0 {
+ reg = <0>;
+ color = <LED_COLOR_ID_YELLOW>;
+ function = LED_FUNCTION_LAN;
+ linux,default-trigger = "netdev";
+ };
+
+ led@1 {
+ reg = <1>;
+ color = <LED_COLOR_ID_GREEN>;
+ function = LED_FUNCTION_LAN;
+ linux,default-trigger = "netdev";
+ };
+ };
+
+ vddio1: vddio-regulator {
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ };
+ };
+ };
+};
+
+&ethphy0 {
+ leds {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ led@0 {
+ reg = <0>;
+ color = <LED_COLOR_ID_YELLOW>;
+ function = LED_FUNCTION_LAN;
+ linux,default-trigger = "netdev";
+ };
+
+ led@1 {
+ reg = <1>;
+ color = <LED_COLOR_ID_GREEN>;
+ function = LED_FUNCTION_LAN;
+ linux,default-trigger = "netdev";
+ };
+ };
+};
+
+&fec {
+ pinctrl-names = "default", "sleep";
+ pinctrl-0 = <&pinctrl_fec>;
+ pinctrl-1 = <&pinctrl_fec_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 = <&ethphy1>;
+ phy-supply = <&reg_fec_phy>;
+ status = "okay";
+};
+
+&flexcan1 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_flexcan1>;
+ status = "okay";
+};
+
+&lpi2c1 {
+ clock-frequency = <400000>;
+ pinctrl-names = "default", "sleep", "gpio";
+ pinctrl-0 = <&pinctrl_lpi2c1>;
+ pinctrl-1 = <&pinctrl_lpi2c1_gpio>;
+ pinctrl-2 = <&pinctrl_lpi2c1_gpio>;
+ scl-gpios = <&gpio1 0 GPIO_ACTIVE_HIGH>;
+ sda-gpios = <&gpio1 1 GPIO_ACTIVE_HIGH>;
+ status = "okay";
+
+ pca9534: gpio@20 {
+ compatible = "nxp,pca9534";
+ reg = <0x20>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_pca9534>;
+ interrupt-parent = <&gpio3>;
+ interrupts = <26 IRQ_TYPE_EDGE_FALLING>;
+ wakeup-source;
+ };
+
+ pca6408: gpio@21 {
+ compatible = "nxp,pcal6408";
+ reg = <0x21>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_pca6408>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ interrupt-parent = <&gpio2>;
+ interrupts = <4 IRQ_TYPE_EDGE_FALLING>;
+ vcc-supply = <&reg_rgb_sel>;
+ wakeup-source;
+
+ tpm-enable-hog {
+ gpio-hog;
+ gpios = <4 GPIO_ACTIVE_HIGH>;
+ output-high;
+ line-name = "tpm_en";
+ };
+ };
+
+ /* USB Type-C Controller */
+ ptn5150: typec@3d {
+ compatible = "nxp,ptn5150";
+ reg = <0x3d>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_ptn5150>;
+ interrupt-parent = <&gpio1>;
+ interrupts = <10 IRQ_TYPE_NONE>;
+
+ port {
+ typec1_dr_sw: endpoint {
+ remote-endpoint = <&usb1_drd_sw>;
+ };
+ };
+ };
+
+ st33ktpm2xi2c: tpm@2e {
+ compatible = "st,st33ktpm2xi2c", "tcg,tpm-tis-i2c";
+ reg = <0x2e>;
+ };
+
+ /* Capacitive touch controller */
+ ft5x06_ts: touchscreen@38 {
+ compatible = "edt,edt-ft5206";
+ reg = <0x38>;
+ interrupt-parent = <&pca6408>;
+ interrupts = <3 IRQ_TYPE_EDGE_FALLING>;
+ touchscreen-size-x = <800>;
+ touchscreen-size-y = <480>;
+ touchscreen-inverted-x;
+ touchscreen-inverted-y;
+ wakeup-source;
+ };
+
+ /* DS1337 RTC module */
+ rtc@68 {
+ compatible = "dallas,ds1337";
+ reg = <0x68>;
+ };
+};
+
+/* pins conflict */
+&lpspi8 {
+ status = "disabled";
+};
+
+/* Console */
+&lpuart1 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_uart1>;
+ status = "okay";
+};
+
+&tpm4 {
+ pinctrl-names = "default", "sleep";
+ pinctrl-0 = <&pinctrl_tpm4>;
+ pinctrl-1 = <&pinctrl_tpm4_sleep>;
+ status = "okay";
+};
+
+&usbotg1 {
+ dr_mode = "otg";
+ hnp-disable;
+ srp-disable;
+ adp-disable;
+ usb-role-switch;
+ samsung,picophy-pre-emp-curr-control = <3>;
+ samsung,picophy-dc-vol-level-adjust = <7>;
+ status = "okay";
+
+ port {
+ usb1_drd_sw: endpoint {
+ remote-endpoint = <&typec1_dr_sw>;
+ };
+ };
+};
+
+&usbotg2 {
+ dr_mode = "host";
+ disable-over-current;
+ status = "okay";
+};
+
+/* SD */
+&usdhc2 {
+ pinctrl-names = "default", "state_100mhz", "state_200mhz", "sleep";
+ pinctrl-0 = <&pinctrl_usdhc2>, <&pinctrl_usdhc2_gpio>;
+ pinctrl-1 = <&pinctrl_usdhc2_100mhz>, <&pinctrl_usdhc2_gpio>;
+ pinctrl-2 = <&pinctrl_usdhc2_200mhz>, <&pinctrl_usdhc2_gpio>;
+ pinctrl-3 = <&pinctrl_usdhc2_sleep>, <&pinctrl_usdhc2_gpio_sleep>;
+ bus-width = <4>;
+ cd-gpios = <&gpio3 00 GPIO_ACTIVE_LOW>;
+ no-mmc;
+ no-sdio;
+ vmmc-supply = <&reg_usdhc2_vmmc>;
+ status = "okay";
+};
+
+/* Watchdog */
+&wdog3 {
+ status = "okay";
+};
+
+&iomuxc {
+ pinctrl_fec: fecgrp {
+ fsl,pins = <
+ MX91_PAD_ENET2_RD0__ENET2_RGMII_RD0 0x57e
+ MX91_PAD_ENET2_RD1__ENET2_RGMII_RD1 0x57e
+ MX91_PAD_ENET2_RD2__ENET2_RGMII_RD2 0x57e
+ MX91_PAD_ENET2_RD3__ENET2_RGMII_RD3 0x57e
+ MX91_PAD_ENET2_RXC__ENET2_RGMII_RXC 0x5fe
+ MX91_PAD_ENET2_RX_CTL__ENET2_RGMII_RX_CTL 0x57e
+ MX91_PAD_ENET2_TD0__ENET2_RGMII_TD0 0x57e
+ MX91_PAD_ENET2_TD1__ENET2_RGMII_TD1 0x57e
+ MX91_PAD_ENET2_TD2__ENET2_RGMII_TD2 0x57e
+ MX91_PAD_ENET2_TD3__ENET2_RGMII_TD3 0x57e
+ MX91_PAD_ENET2_TXC__ENET2_RGMII_TXC 0x5fe
+ MX91_PAD_ENET2_TX_CTL__ENET2_RGMII_TX_CTL 0x57e
+ >;
+ };
+
+ pinctrl_fec_sleep: fecsleepgrp {
+ fsl,pins = <
+ MX91_PAD_ENET2_RD0__GPIO4_IO24 0x51e
+ MX91_PAD_ENET2_RD1__GPIO4_IO25 0x51e
+ MX91_PAD_ENET2_RD2__GPIO4_IO26 0x51e
+ MX91_PAD_ENET2_RD3__GPIO4_IO27 0x51e
+ MX91_PAD_ENET2_RXC__GPIO4_IO23 0x51e
+ MX91_PAD_ENET2_RX_CTL__GPIO4_IO22 0x51e
+ MX91_PAD_ENET2_TD0__GPIO4_IO19 0x51e
+ MX91_PAD_ENET2_TD1__GPIO4_IO18 0x51e
+ MX91_PAD_ENET2_TD2__GPIO4_IO17 0x51e
+ MX91_PAD_ENET2_TD3__GPIO4_IO16 0x51e
+ MX91_PAD_ENET2_TXC__GPIO4_IO21 0x51e
+ MX91_PAD_ENET2_TX_CTL__GPIO4_IO20 0x51e
+ >;
+ };
+
+ pinctrl_flexcan1: flexcan1grp {
+ fsl,pins = <
+ MX91_PAD_PDM_CLK__CAN1_TX 0x139e
+ MX91_PAD_PDM_BIT_STREAM0__CAN1_RX 0x139e
+ >;
+ };
+
+ pinctrl_lpi2c1: lpi2c1grp {
+ fsl,pins = <
+ MX91_PAD_I2C1_SCL__LPI2C1_SCL 0x40000b9e
+ MX91_PAD_I2C1_SDA__LPI2C1_SDA 0x40000b9e
+ >;
+ };
+
+ pinctrl_lpi2c1_gpio: lpi2c1gpiogrp {
+ fsl,pins = <
+ MX91_PAD_I2C1_SCL__GPIO1_IO0 0x31e
+ MX91_PAD_I2C1_SDA__GPIO1_IO1 0x31e
+ >;
+ };
+
+ pinctrl_pca6408: pca6408grp {
+ fsl,pins = <
+ MX91_PAD_GPIO_IO04__GPIO2_IO4 0x31e
+ >;
+ };
+
+ pinctrl_pca9534: pca9534grp {
+ fsl,pins = <
+ MX91_PAD_CCM_CLKO1__GPIO3_IO26 0x31e
+ >;
+ };
+
+ pinctrl_ptn5150: ptn5150grp {
+ fsl,pins = <
+ MX91_PAD_PDM_BIT_STREAM1__GPIO1_IO10 0x31e
+ >;
+ };
+
+ pinctrl_uart1: uart1grp {
+ fsl,pins = <
+ MX91_PAD_UART1_RXD__LPUART1_RX 0x31e
+ MX91_PAD_UART1_TXD__LPUART1_TX 0x31e
+ >;
+ };
+
+ pinctrl_tpm4: tpm4grp {
+ fsl,pins = <
+ MX91_PAD_GPIO_IO05__TPM4_CH0 0x51e
+ >;
+ };
+
+ pinctrl_tpm4_sleep: tpm4sleepgrp {
+ fsl,pins = <
+ MX91_PAD_GPIO_IO05__GPIO2_IO5 0x51e
+ >;
+ };
+
+ pinctrl_usdhc2: usdhc2grp {
+ fsl,pins = <
+ MX91_PAD_SD2_CLK__USDHC2_CLK 0x1582
+ MX91_PAD_SD2_CMD__USDHC2_CMD 0x1382
+ MX91_PAD_SD2_DATA0__USDHC2_DATA0 0x1382
+ MX91_PAD_SD2_DATA1__USDHC2_DATA1 0x1382
+ MX91_PAD_SD2_DATA2__USDHC2_DATA2 0x1382
+ MX91_PAD_SD2_DATA3__USDHC2_DATA3 0x1382
+ MX91_PAD_SD2_VSELECT__USDHC2_VSELECT 0x51e
+ >;
+ };
+
+ pinctrl_usdhc2_100mhz: usdhc2-100mhzgrp {
+ fsl,pins = <
+ MX91_PAD_SD2_CLK__USDHC2_CLK 0x158e
+ MX91_PAD_SD2_CMD__USDHC2_CMD 0x138e
+ MX91_PAD_SD2_DATA0__USDHC2_DATA0 0x138e
+ MX91_PAD_SD2_DATA1__USDHC2_DATA1 0x138e
+ MX91_PAD_SD2_DATA2__USDHC2_DATA2 0x138e
+ MX91_PAD_SD2_DATA3__USDHC2_DATA3 0x138e
+ MX91_PAD_SD2_VSELECT__USDHC2_VSELECT 0x51e
+ >;
+ };
+
+ pinctrl_usdhc2_200mhz: usdhc2-200mhzgrp {
+ fsl,pins = <
+ MX91_PAD_SD2_CLK__USDHC2_CLK 0x15fe
+ MX91_PAD_SD2_CMD__USDHC2_CMD 0x13fe
+ MX91_PAD_SD2_DATA0__USDHC2_DATA0 0x13fe
+ MX91_PAD_SD2_DATA1__USDHC2_DATA1 0x13fe
+ MX91_PAD_SD2_DATA2__USDHC2_DATA2 0x13fe
+ MX91_PAD_SD2_DATA3__USDHC2_DATA3 0x13fe
+ MX91_PAD_SD2_VSELECT__USDHC2_VSELECT 0x51e
+ >;
+ };
+
+ pinctrl_usdhc2_sleep: usdhc2sleep-grp {
+ fsl,pins = <
+ MX91_PAD_SD2_CLK__GPIO3_IO1 0x51e
+ MX91_PAD_SD2_CMD__GPIO3_IO2 0x51e
+ MX91_PAD_SD2_DATA0__GPIO3_IO3 0x51e
+ MX91_PAD_SD2_DATA1__GPIO3_IO4 0x51e
+ MX91_PAD_SD2_DATA2__GPIO3_IO5 0x51e
+ MX91_PAD_SD2_DATA3__GPIO3_IO6 0x51e
+ MX91_PAD_SD2_VSELECT__GPIO3_IO19 0x51e
+ >;
+ };
+
+ pinctrl_usdhc2_gpio: usdhc2gpiogrp {
+ fsl,pins = <
+ MX91_PAD_SD2_CD_B__GPIO3_IO0 0x31e
+ >;
+ };
+
+ pinctrl_usdhc2_gpio_sleep: usdhc2gpiosleep-grp {
+ fsl,pins = <
+ MX91_PAD_SD2_CD_B__GPIO3_IO0 0x51e
+ >;
+ };
+};
--
2.47.3