boards: sam4_xpro: add HSMCI support

Adds support for the HSMCI peripheral enabling SD card access
on the SAM4E eXplained pro board

Signed-off-by: Vincent van Beveren <v.van.beveren@nikhef.nl>

boards/arm/sam4e_xpro/sam4e_xpro-pinctrl.dtsi

@@ -94,4 +94,16 @@
 				 <PD24A_PWM_PWML0>;
 		};
 	};
+
+	hsmci_default: hsmci_default {
+		group1 {
+			pinmux = <PA28C_HSMCI_MCCDA>,
+				 <PA29C_HSMCI_MCCK>,
+				 <PA30C_HSMCI_MCDA0>,
+				 <PA31C_HSMCI_MCDA1>,
+				 <PA26C_HSMCI_MCDA2>,
+				 <PA27C_HSMCI_MCDA3>;
+		};
+	};
+
 };

boards/arm/sam4e_xpro/sam4e_xpro.dts

@@ -21,6 +21,7 @@
 		sw0 = &user_button;
 		wdog = &wdt;
 		watchdog0 = &wdt;
+		sdhc0 = &hsmci;
 	};
 
 	chosen {
@@ -211,6 +212,17 @@
 	pinctrl-names = "default";
 };
 
+&hsmci {
+	status = "okay";
+
+	pinctrl-0 = <&hsmci_default>;
+	pinctrl-names = "default";
+	mmc {
+		compatible = "zephyr,sdmmc-disk";
+		status = "okay";
+	};
+};
+
 &wdt {
 	status = "okay";
 };

boards/arm/sam4e_xpro/sam4e_xpro.yaml

@@ -10,6 +10,7 @@ supported:
   - netif:eth
   - gpio
   - spi
+  - sdhc
   - watchdog
   - xpro_gpio
   - xpro_i2c