VAR-SOM-MX8M-MINI-Rev10

VAR-SOM-MX8M-MINI/NANO Revision 1.0 Support

This tutorial shows how to adjust kernel DTS files for VAR-SOM-MX8M-MINI/NANO revision 1.0, as starting from Yocto Dunfell this old SOM revision is not supported "out of the box".

On Symphony-Board 1.4a and above

Apply the following patch to imx8mn-var-som-symphony.dts:

--- arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts   2020-12-30 23:34:41.160655646 +0200
+++ arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony-rev10.dts     2021-01-10 10:56:44.596476589 +0200
@@ -212,7 +212,7 @@
 
        pinctrl_usdhc2_gpio: usdhc2grpgpio {
                fsl,pins = <
-                       MX8MN_IOMUXC_GPIO1_IO10_GPIO1_IO10              0x41
+                       MX8MN_IOMUXC_SD2_CD_B_GPIO2_IO12                0x41
                >;
        };
 
@@ -412,7 +412,7 @@
        pinctrl-0 = <&pinctrl_usdhc2>, <&pinctrl_usdhc2_gpio>;
        pinctrl-1 = <&pinctrl_usdhc2_100mhz>, <&pinctrl_usdhc2_gpio>;
        pinctrl-2 = <&pinctrl_usdhc2_200mhz>, <&pinctrl_usdhc2_gpio>;
-       cd-gpios = <&gpio1 10 GPIO_ACTIVE_LOW>;
+       cd-gpios = <&gpio2 12 GPIO_ACTIVE_LOW>;
        bus-width = <4>;
        vmmc-supply = <&reg_usdhc2_vmmc>;
        status = "okay";

On Symphony-Board 1.4 and below

Apply the following patch to imx8mn-var-som-symphony-legacy.dts:

--- arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony-legacy.dts    2020-12-30 23:28:09.881966875 +0200
+++ arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony-legacy-rev10.dts      2021-01-10 09:22:13.465180492 +0200
@@ -10,7 +10,21 @@
        model = "Variscite VAR-SOM-MX8M-NANO on Symphony-Board 1.4 and below";
 };
 
-&usbotg1 {
-       /delete-property/ extcon;
+&iomuxc {
+       pinctrl_usdhc2_gpio: usdhc2grpgpio {
+               fsl,pins = <
+                       MX8MN_IOMUXC_SD2_CD_B_GPIO2_IO12        0xc1
+               >;
+       };
+
+       pinctrl_extcon: extcongrp {
+               fsl,pins = <
+                       MX8MN_IOMUXC_GPIO1_IO10_GPIO1_IO10      0x16
+               >;
+       };
+};
+
+&usdhc2 {
+       cd-gpios = <&gpio2 12 GPIO_ACTIVE_LOW>;
 };

CAN bus

See also: VAR-SOM-MX8M-MINI/NANO Rev 1.0/1.1/1.2 CAN bus support