boards: microchip: sam_e54_xpro: Add SERCOM ports

Expand SERCOM serial ports in the sam_e54_xpro board. This add and
enable sercom0, sercom1 and sercom5 ports which are located in the
xplained pro header. It makes use of the microchip,xpro-header to
easy use with shields.

Signed-off-by: James Liu <James.Liu2@microchip.com>

Author: JamesLiu-Microchip

boards/microchip/sam/sam_e54_xpro/sam_e54_xpro-pinctrl.dtsi

@@ -7,13 +7,34 @@
 #include <dt-bindings/sam/sam_d5x_e5x/atsame54/atsame54p20a-pinctrl.h>
 
 &pinctrl {
+	sercom0_uart_default: sercom0-uart-default {
+		group1 {
+			pinmux = <PA5D_SERCOM0_PAD1>,
+				 <PA4D_SERCOM0_PAD0>;
+		};
+	};
+
+	sercom1_uart_default: sercom1-uart-default {
+		group1 {
+			pinmux = <PC23C_SERCOM1_PAD1>,
+				 <PC22C_SERCOM1_PAD0>;
+		};
+	};
+
 	sercom2_uart_default: sercom2_uart_default {
 		group1 {
 			pinmux = <PB25D_SERCOM2_PAD0>,
 				 <PB24D_SERCOM2_PAD1>;
 		};
 	};
 
+	sercom5_uart_default: sercom5-uart-default {
+		group1 {
+			pinmux = <PB17C_SERCOM5_PAD1>,
+				 <PB16C_SERCOM5_PAD0>;
+		};
+	};
+
 	sercom6_spi_default: sercom6_spi_default {
 		group1 {
 			pinmux = <PC4C_SERCOM6_PAD0>,

boards/microchip/sam/sam_e54_xpro/sam_e54_xpro.dts

@@ -286,6 +286,40 @@
 	};
 };
 
+&sercom0 {
+	compatible = "microchip,sercom-g1-uart";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	current-speed = <115200>;
+	data-bits = <8>;
+	parity = "none";
+	stop-bits = "1";
+	rxpo = <1>;
+	txpo = <0>;
+	pinctrl-0 = <&sercom0_uart_default>;
+	pinctrl-names = "default";
+	dmas = <&dmac 3 4>, <&dmac 4 5>;
+	dma-names = "rx", "tx";
+	status = "okay";
+};
+
+&sercom1 {
+	compatible = "microchip,sercom-g1-uart";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	current-speed = <115200>;
+	data-bits = <8>;
+	parity = "none";
+	stop-bits = "1";
+	rxpo = <1>;
+	txpo = <0>;
+	pinctrl-0 = <&sercom1_uart_default>;
+	pinctrl-names = "default";
+	dmas = <&dmac 5 6>, <&dmac 6 7>;
+	dma-names = "rx", "tx";
+	status = "okay";
+};
+
 &sercom2 {
 	compatible = "microchip,sercom-g1-uart";
 	#address-cells = <1>;
@@ -303,6 +337,23 @@
 	status = "okay";
 };
 
+&sercom5 {
+	compatible = "microchip,sercom-g1-uart";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	current-speed = <115200>;
+	data-bits = <8>;
+	parity = "none";
+	stop-bits = "1";
+	rxpo = <1>;
+	txpo = <0>;
+	pinctrl-0 = <&sercom5_uart_default>;
+	pinctrl-names = "default";
+	dmas = <&dmac 7 0xe>, <&dmac 8 0xf>;
+	dma-names = "rx", "tx";
+	status = "okay";
+};
+
 &sercom6 {
 	compatible = "microchip,sercom-g1-spi";
 
@@ -375,3 +426,9 @@
 	pinctrl-0 = <&dac_default>;
 	pinctrl-names = "default";
 };
+
+ext1_serial: &sercom0 {};
+
+ext2_serial: &sercom5 {};
+
+ext3_serial: &sercom1 {};