boards: add sercom support based on xplained pro header

sercom support based on xplained pro header.

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>;
+		};
+	};
+
 	tcc0_pwm_default: tcc0_pwm_default {
 		group1 {
 			pinmux = <PC18F_TCC0_WO2>;

boards/microchip/sam/sam_e54_xpro/sam_e54_xpro.dts

@@ -143,6 +143,42 @@
 	clock-frequency = <48000000>;
 };
 
+&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";
+	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";
+	status = "okay";
+};
+
 &sercom2 {
 	status = "okay";
 	compatible = "microchip,sercom-g1-uart";
@@ -161,6 +197,24 @@
 	pinctrl-names = "default";
 };
 
+&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";
+	status = "okay";
+};
+
 &tcc0 {
 	compatible = "microchip,tcc-g1-pwm";
 	status = "okay";
@@ -171,3 +225,12 @@
 	prescaler = <8>;
 	channels = <6>;
 };
+
+ext1_serial: &sercom0 {
+};
+
+ext2_serial: &sercom5 {
+};
+
+ext3_serial: &sercom1 {
+};