arm: dts: imx7: colibri: add usdhci peripherals to device tree

Add usdhci peripherals to device tree. This allows to use DM_MMC
for Colibri iMX7 devices.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
diff --git a/arch/arm/dts/imx7-colibri-emmc.dts b/arch/arm/dts/imx7-colibri-emmc.dts
index 295ca05..efd6000 100644
--- a/arch/arm/dts/imx7-colibri-emmc.dts
+++ b/arch/arm/dts/imx7-colibri-emmc.dts
@@ -10,7 +10,38 @@
 	model = "Toradex Colibri iMX7D 1GB (eMMC)";
 	compatible = "toradex,imx7d-colibri-emmc", "fsl,imx7d";
 
+	aliases {
+		mmc0 = &usdhc3;
+		mmc1 = &usdhc1;
+	};
+
 	chosen {
 		stdout-path = &uart1;
 	};
 };
+
+&usdhc3 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_usdhc3>;
+	bus-width = <8>;
+	non-removable;
+	status = "okay";
+};
+
+&iomuxc {
+	pinctrl_usdhc3: usdhc3grp {
+		fsl,pins = <
+			MX7D_PAD_SD3_CMD__SD3_CMD		0x59
+			MX7D_PAD_SD3_CLK__SD3_CLK		0x19
+			MX7D_PAD_SD3_DATA0__SD3_DATA0		0x59
+			MX7D_PAD_SD3_DATA1__SD3_DATA1		0x59
+			MX7D_PAD_SD3_DATA2__SD3_DATA2		0x59
+			MX7D_PAD_SD3_DATA3__SD3_DATA3		0x59
+			MX7D_PAD_SD3_DATA4__SD3_DATA4		0x59
+			MX7D_PAD_SD3_DATA5__SD3_DATA5		0x59
+			MX7D_PAD_SD3_DATA6__SD3_DATA6		0x59
+			MX7D_PAD_SD3_DATA7__SD3_DATA7		0x59
+			MX7D_PAD_SD3_STROBE__SD3_STROBE         0x19
+		>;
+	};
+};