boards: atmel: samx7x add hsmci peripheral

Adds samx7x hsmci peripheral according to datasheet sections 10-1 and 14.1: https://ww1.microchip.com/downloads/aemDocuments/documents/MCU32/ProductDocuments/DataSheets/SAM-E70-S70-V70-V71-Family-Data-Sheet-DS60001527.pdf

Updates sam_e70_xplained overlay to include pin mapping to the SD card
connected to the hsmci and adds sdhc0 alias.

Signed-off-by: John Whittington <git@jbrengineering.co.uk>

boards/atmel/sam/sam_e70_xplained/sam_e70_xplained-common.dtsi

@@ -17,6 +17,7 @@
 		led0 = &green_led;
 		sw0 = &sw0_user_button;
 		watchdog0 = &wdt;
+		sdhc0 = &hsmci;
 	};
 
 	chosen {
@@ -238,3 +239,17 @@ zephyr_udc0: &usbhs {
 		pinctrl-names = "default";
 	};
 };
+
+&hsmci {
+	status = "okay";
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&hsmci_default>;
+	cd-gpios = <&pioc 16 GPIO_ACTIVE_LOW>;
+
+	mmc {
+		compatible = "zephyr,sdmmc-disk";
+		disk-name = "SD";
+		status = "okay";
+	};
+};

boards/atmel/sam/sam_e70_xplained/sam_e70_xplained-pinctrl.dtsi

@@ -182,4 +182,15 @@
 				 <PD17B_USART2_SCK>;
 		};
 	};
+
+	hsmci_default: hsmci_default {
+		group1 {
+			pinmux = <PA28C_HSMCI_MCCDA>,
+				 <PA25D_HSMCI_MCCK>,
+				 <PA30C_HSMCI_MCDA0>,
+				 <PA31C_HSMCI_MCDA1>,
+				 <PA26C_HSMCI_MCDA2>,
+				 <PA27C_HSMCI_MCDA3>;
+		};
+	};
 };

boards/atmel/sam/sam_e70_xplained/sam_e70_xplained_same70q21.yaml

@@ -18,6 +18,7 @@ supported:
   - i2s
   - pwm
   - netif:eth
+  - sdhc
   - spi
   - usb_device
   - watchdog

boards/atmel/sam/sam_e70_xplained/sam_e70_xplained_same70q21b.yaml

@@ -18,6 +18,7 @@ supported:
   - i2s
   - pwm
   - netif:eth
+  - sdhc
   - spi
   - usb_device
   - watchdog

dts/arm/atmel/samx7x.dtsi

@@ -46,6 +46,13 @@
 	};
 
 	soc {
+		hsmci: hsmci@40000000 {
+			compatible = "atmel,sam-hsmci";
+			reg = <0x40000000 0x4000>;
+			clocks = <&pmc PMC_TYPE_PERIPHERAL 18>;
+			status = "disabled";
+		};
+
 		ssc: ssc@40004000 {
 			compatible = "atmel,sam-ssc";
 			reg = <0x40004000 0x4000>;