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Message-ID: <aYOht2HNhEIS8VZV@lizhi-Precision-Tower-5810>
Date: Wed, 4 Feb 2026 14:44:55 -0500
From: Frank Li <Frank.li@....com>
To: Stefano Radaelli <stefano.radaelli21@...il.com>
Cc: 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>, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, imx@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de,
festevam@...il.com, alexander.stein@...tq-group.com,
dario.binacchi@...rulasolutions.com, primoz.fiser@...ik.com,
Markus.Niebel@...group.com, y.moog@...tec.de, josua@...id-run.com,
francesco.dolcini@...adex.com, maudspierings@...ontroll.com,
Stefano Radaelli <stefano.r@...iscite.com>
Subject: Re: [PATCH v1 2/3] arm64: dts: freescale: Add support for Variscite
DART-MX91
On Wed, Feb 04, 2026 at 06:03:55PM +0100, Stefano Radaelli wrote:
> From: Stefano Radaelli <stefano.r@...iscite.com>
>
> Add device tree support for the Variscite DART-MX91 system on module.
> This SOM is designed to be used with various carrier boards.
>
> The module includes:
> - NXP i.MX91 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-91/dart-mx91/
>
> Signed-off-by: Stefano Radaelli <stefano.r@...iscite.com>
> ---
...
> +
> +&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";
> +
> + 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;
> + };
> + };
> + };
> +
> + wm8904: audio-codec@1a {
order as hex address value
Frank
> + 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;
> + };
> +};
> +
> +/* BT module */
> +&lpuart5 {
> + pinctrl-names = "default";
> + pinctrl-0 = <&pinctrl_uart5>, <&pinctrl_bt>;
> + uart-has-rtscts;
> + status = "okay";
> +
> + bluetooth {
> + compatible = "nxp,88w8987-bt";
> + };
> +};
> +
> +&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";
> +};
> +
> +&wdog3 {
> + status = "okay";
> +};
> +
> +&iomuxc {
> + pinctrl_bt: btgrp {
> + fsl,pins = <
> + MX91_PAD_ENET2_MDIO__GPIO4_IO15 0x51e
> + >;
> + };
> +
> + pinctrl_eqos: eqosgrp {
> + fsl,pins = <
> + MX91_PAD_ENET1_MDC__ENET1_MDC 0x57e
> + MX91_PAD_ENET1_MDIO__ENET_QOS_MDIO 0x57e
> + MX91_PAD_ENET1_RD0__ENET_QOS_RGMII_RD0 0x57e
> + MX91_PAD_ENET1_RD1__ENET_QOS_RGMII_RD1 0x57e
> + MX91_PAD_ENET1_RD2__ENET_QOS_RGMII_RD2 0x57e
> + MX91_PAD_ENET1_RD3__ENET_QOS_RGMII_RD3 0x57e
> + MX91_PAD_ENET1_RXC__ENET_QOS_RGMII_RXC 0x5fe
> + MX91_PAD_ENET1_RX_CTL__ENET_QOS_RGMII_RX_CTL 0x57e
> + MX91_PAD_ENET1_TD0__ENET_QOS_RGMII_TD0 0x57e
> + MX91_PAD_ENET1_TD1__ENET1_RGMII_TD1 0x57e
> + MX91_PAD_ENET1_TD2__ENET_QOS_RGMII_TD2 0x57e
> + MX91_PAD_ENET1_TD3__ENET_QOS_RGMII_TD3 0x57e
> + MX91_PAD_ENET1_TXC__CCM_ENET_QOS_CLOCK_GENERATE_TX_CLK 0x5fe
> + MX91_PAD_ENET1_TX_CTL__ENET_QOS_RGMII_TX_CTL 0x57e
> + MX91_PAD_UART2_TXD__GPIO1_IO7 0x51e
> + >;
> + };
> +
> + pinctrl_eqos_sleep: eqos-sleepgrp {
> + fsl,pins = <
> + MX91_PAD_ENET1_MDC__GPIO4_IO0 0x31e
> + MX91_PAD_ENET1_MDIO__GPIO4_IO1 0x31e
> + MX91_PAD_ENET1_RD0__GPIO4_IO10 0x31e
> + MX91_PAD_ENET1_RD1__GPIO4_IO11 0x31e
> + MX91_PAD_ENET1_RD2__GPIO4_IO12 0x31e
> + MX91_PAD_ENET1_RD3__GPIO4_IO13 0x31e
> + MX91_PAD_ENET1_RXC__GPIO4_IO9 0x31e
> + MX91_PAD_ENET1_RX_CTL__GPIO4_IO8 0x31e
> + MX91_PAD_ENET1_TD0__GPIO4_IO5 0x31e
> + MX91_PAD_ENET1_TD1__GPIO4_IO4 0x31e
> + MX91_PAD_ENET1_TD2__GPIO4_IO3 0x31e
> + MX91_PAD_ENET1_TD3__GPIO4_IO2 0x31e
> + MX91_PAD_ENET1_TXC__GPIO4_IO7 0x31e
> + MX91_PAD_ENET1_TX_CTL__GPIO4_IO6 0x31e
> + >;
> + };
> +
> + pinctrl_lpi2c3: lpi2c3grp {
> + fsl,pins = <
> + MX91_PAD_GPIO_IO28__LPI2C3_SDA 0x40000b9e
> + MX91_PAD_GPIO_IO29__LPI2C3_SCL 0x40000b9e
> + >;
> + };
> +
> + pinctrl_lpi2c3_gpio: lpi2c3gpiogrp {
> + fsl,pins = <
> + MX91_PAD_GPIO_IO28__GPIO2_IO28 0x40000b9e
> + MX91_PAD_GPIO_IO29__GPIO2_IO29 0x40000b9e
> + >;
> + };
> +
> + pinctrl_sai1: sai1grp {
> + fsl,pins = <
> + MX91_PAD_SAI1_TXC__SAI1_TX_BCLK 0x31e
> + MX91_PAD_SAI1_TXFS__SAI1_TX_SYNC 0x31e
> + MX91_PAD_SAI1_TXD0__SAI1_TX_DATA0 0x31e
> + MX91_PAD_SAI1_RXD0__SAI1_RX_DATA0 0x31e
> + MX91_PAD_I2C2_SDA__SAI1_RX_BCLK 0x31e
> + MX91_PAD_I2C2_SCL__SAI1_RX_SYNC 0x31e
> + MX91_PAD_UART2_RXD__SAI1_MCLK 0x31e
> + >;
> + };
> +
> + pinctrl_sai1_sleep: sai1-sleepgrp {
> + fsl,pins = <
> + MX91_PAD_SAI1_TXC__GPIO1_IO12 0x31e
> + MX91_PAD_SAI1_TXFS__GPIO1_IO11 0x31e
> + MX91_PAD_SAI1_TXD0__GPIO1_IO13 0x31e
> + MX91_PAD_SAI1_RXD0__GPIO1_IO14 0x31e
> + MX91_PAD_UART2_RXD__GPIO1_IO6 0x31e
> + MX91_PAD_I2C2_SDA__GPIO1_IO3 0x31e
> + MX91_PAD_I2C2_SCL__GPIO1_IO2 0x31e
> + >;
> + };
> +
> + pinctrl_uart5: uart5grp {
> + fsl,pins = <
> + MX91_PAD_DAP_TDO_TRACESWO__LPUART5_TX 0x31e
> + MX91_PAD_DAP_TDI__LPUART5_RX 0x31e
> + MX91_PAD_DAP_TMS_SWDIO__LPUART5_RTS_B 0x31e
> + MX91_PAD_DAP_TCLK_SWCLK__LPUART5_CTS_B 0x31e
> + >;
> + };
> +
> + pinctrl_usdhc1: usdhc1grp {
> + fsl,pins = <
> + MX91_PAD_SD1_CLK__USDHC1_CLK 0x1582
> + MX91_PAD_SD1_CMD__USDHC1_CMD 0x1382
> + MX91_PAD_SD1_DATA0__USDHC1_DATA0 0x1382
> + MX91_PAD_SD1_DATA1__USDHC1_DATA1 0x1382
> + MX91_PAD_SD1_DATA2__USDHC1_DATA2 0x1382
> + MX91_PAD_SD1_DATA3__USDHC1_DATA3 0x1382
> + MX91_PAD_SD1_DATA4__USDHC1_DATA4 0x1382
> + MX91_PAD_SD1_DATA5__USDHC1_DATA5 0x1382
> + MX91_PAD_SD1_DATA6__USDHC1_DATA6 0x1382
> + MX91_PAD_SD1_DATA7__USDHC1_DATA7 0x1382
> + MX91_PAD_SD1_STROBE__USDHC1_STROBE 0x1582
> + >;
> + };
> +
> + pinctrl_usdhc1_100mhz: usdhc1-100mhzgrp {
> + fsl,pins = <
> + MX91_PAD_SD1_CLK__USDHC1_CLK 0x158e
> + MX91_PAD_SD1_CMD__USDHC1_CMD 0x138e
> + MX91_PAD_SD1_DATA0__USDHC1_DATA0 0x138e
> + MX91_PAD_SD1_DATA1__USDHC1_DATA1 0x138e
> + MX91_PAD_SD1_DATA2__USDHC1_DATA2 0x138e
> + MX91_PAD_SD1_DATA3__USDHC1_DATA3 0x138e
> + MX91_PAD_SD1_DATA4__USDHC1_DATA4 0x138e
> + MX91_PAD_SD1_DATA5__USDHC1_DATA5 0x138e
> + MX91_PAD_SD1_DATA6__USDHC1_DATA6 0x138e
> + MX91_PAD_SD1_DATA7__USDHC1_DATA7 0x138e
> + MX91_PAD_SD1_STROBE__USDHC1_STROBE 0x158e
> + >;
> + };
> +
> + pinctrl_usdhc1_200mhz: usdhc1-200mhzgrp {
> + fsl,pins = <
> + MX91_PAD_SD1_CLK__USDHC1_CLK 0x15fe
> + MX91_PAD_SD1_CMD__USDHC1_CMD 0x13fe
> + MX91_PAD_SD1_DATA0__USDHC1_DATA0 0x13fe
> + MX91_PAD_SD1_DATA1__USDHC1_DATA1 0x13fe
> + MX91_PAD_SD1_DATA2__USDHC1_DATA2 0x13fe
> + MX91_PAD_SD1_DATA3__USDHC1_DATA3 0x13fe
> + MX91_PAD_SD1_DATA4__USDHC1_DATA4 0x13fe
> + MX91_PAD_SD1_DATA5__USDHC1_DATA5 0x13fe
> + MX91_PAD_SD1_DATA6__USDHC1_DATA6 0x13fe
> + MX91_PAD_SD1_DATA7__USDHC1_DATA7 0x13fe
> + MX91_PAD_SD1_STROBE__USDHC1_STROBE 0x15fe
> + >;
> + };
> +
> + pinctrl_usdhc3: usdhc3grp {
> + fsl,pins = <
> + MX91_PAD_SD3_CLK__USDHC3_CLK 0x1582
> + MX91_PAD_SD3_CMD__USDHC3_CMD 0x1382
> + MX91_PAD_SD3_DATA0__USDHC3_DATA0 0x1382
> + MX91_PAD_SD3_DATA1__USDHC3_DATA1 0x1382
> + MX91_PAD_SD3_DATA2__USDHC3_DATA2 0x1382
> + MX91_PAD_SD3_DATA3__USDHC3_DATA3 0x1382
> + >;
> + };
> +
> + pinctrl_usdhc3_100mhz: usdhc3-100mhzgrp {
> + fsl,pins = <
> + MX91_PAD_SD3_CLK__USDHC3_CLK 0x158e
> + MX91_PAD_SD3_CMD__USDHC3_CMD 0x138e
> + MX91_PAD_SD3_DATA0__USDHC3_DATA0 0x138e
> + MX91_PAD_SD3_DATA1__USDHC3_DATA1 0x138e
> + MX91_PAD_SD3_DATA2__USDHC3_DATA2 0x138e
> + MX91_PAD_SD3_DATA3__USDHC3_DATA3 0x138e
> + >;
> + };
> +
> + pinctrl_usdhc3_200mhz: usdhc3-200mhzgrp {
> + fsl,pins = <
> + MX91_PAD_SD3_CLK__USDHC3_CLK 0x15fe
> + MX91_PAD_SD3_CMD__USDHC3_CMD 0x13fe
> + MX91_PAD_SD3_DATA0__USDHC3_DATA0 0x13fe
> + MX91_PAD_SD3_DATA1__USDHC3_DATA1 0x13fe
> + MX91_PAD_SD3_DATA2__USDHC3_DATA2 0x13fe
> + MX91_PAD_SD3_DATA3__USDHC3_DATA3 0x13fe
> + >;
> + };
> +
> + pinctrl_usdhc3_sleep: usdhc3-sleepgrp {
> + fsl,pins = <
> + MX91_PAD_SD3_CLK__GPIO3_IO20 0x31e
> + MX91_PAD_SD3_CMD__GPIO3_IO21 0x31e
> + MX91_PAD_SD3_DATA0__GPIO3_IO22 0x31e
> + MX91_PAD_SD3_DATA1__GPIO3_IO23 0x31e
> + MX91_PAD_SD3_DATA2__GPIO3_IO24 0x31e
> + MX91_PAD_SD3_DATA3__GPIO3_IO25 0x31e
> + >;
> + };
> +
> + pinctrl_usdhc3_wlan: usdhc3wlangrp {
> + fsl,pins = <
> + MX91_PAD_ENET2_MDC__GPIO4_IO14 0x51e
> + MX91_PAD_SD2_RESET_B__GPIO3_IO7 0x51e
> + >;
> + };
> +};
> --
> 2.47.3
>
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