Add support for Atmel SAML21, SAMR34, SAMR35 parts

boards/arm/atsaml21_xpro/Kconfig.board

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+# SAM L21 Xplained Pro board configuration
+
+# Copyright (c) 2021 Argentum Systems Ltd.
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_ATSAML21_XPRO
+	bool "SAM L21 Xplained Pro"
+	depends on SOC_PART_NUMBER_SAML21J18B

boards/arm/atsaml21_xpro/Kconfig.defconfig

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+# SAM L21 Xplained Pro board configuration
+
+# Copyright (c) 2021 Argentum Systems Ltd.
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD
+	default "atsaml21_xpro"
+	depends on BOARD_ATSAML21_XPRO

boards/arm/atsaml21_xpro/atsaml21_xpro-pinctrl.dtsi

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+/*
+ * Copyright (c) 2021 Argentum Systems Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <dt-bindings/pinctrl/saml21j-pinctrl.h>
+
+&pinctrl {
+	tcc0_default: tcc0_default {
+		group1 {
+			pinmux = <PB10F_TCC0_WO4>;
+		};
+	};
+
+	sercom0_default: sercom0_default {
+		group1 {
+			pinmux = <PA4D_SERCOM0_PAD0>,
+				 <PA6D_SERCOM0_PAD2>,
+				 <PA7D_SERCOM0_PAD3>;
+		};
+	};
+
+	sercom1_default: sercom1_default {
+		group1 {
+			pinmux = <PA18C_SERCOM1_PAD2>,
+				 <PA19C_SERCOM1_PAD3>;
+		};
+	};
+
+	sercom2_default: sercom2_default {
+		group1 {
+			pinmux = <PA8D_SERCOM2_PAD0>,
+				 <PA9D_SERCOM2_PAD1>;
+		};
+	};
+
+	sercom3_default: sercom3_default {
+		group1 {
+			pinmux = <PA22C_SERCOM3_PAD0>,
+				 <PA23C_SERCOM3_PAD1>;
+		};
+	};
+
+	sercom4_default: sercom4_default {
+		group1 {
+			pinmux = <PB8D_SERCOM4_PAD0>,
+				 <PB9D_SERCOM4_PAD1>;
+		};
+	};
+
+	sercom5_default: sercom5_default {
+		group1 {
+			pinmux = <PB16C_SERCOM5_PAD0>,
+				 <PB22D_SERCOM5_PAD2>,
+				 <PB23D_SERCOM5_PAD3>;
+		};
+	};
+};

boards/arm/atsaml21_xpro/atsaml21_xpro.dts

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+/*
+ * Copyright (c) 2021 Argentum Systems Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+#include <atmel/saml21.dtsi>
+#include "atsaml21_xpro-pinctrl.dtsi"
+
+/ {
+	model = "SAM L21 Xplained Pro";
+	compatible = "atsaml21,xpro", "atmel,saml21j18b", "atmel,saml21";
+
+	chosen {
+		zephyr,console = &sercom3;
+		zephyr,shell-uart = &sercom3;
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+	};
+
+	/* These aliases are provided for compatibility with samples */
+	aliases {
+		led0 = &led0;
+		pwm-led0 = &pwm_led0;
+		sw0 = &user_button;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		led0: led_0 {
+			gpios = <&portb 10 GPIO_ACTIVE_LOW>;
+			label = "Yellow LED";
+		};
+	};
+
+	pwmleds {
+		compatible = "pwm-leds";
+		pwm_led0: pwm_led_0 {
+			pwms = <&tcc0 0 PWM_MSEC(20)>;
+		};
+	};
+
+	buttons {
+		compatible = "gpio-keys";
+		user_button: button_0 {
+			gpios = <&porta 2 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+			label = "SW0";
+		};
+	};
+};
+
+&cpu0 {
+	clock-frequency = <48000000>;
+};
+
+&adc {
+	status = "okay";
+};
+
+&tcc0 {
+	status = "okay";
+	compatible = "atmel,sam0-tcc-pwm";
+	/* Gives a maximum period of 1.4s */
+	prescaler = <4>;
+	#pwm-cells = <2>;
+
+	pinctrl-0 = <&tcc0_default>;
+	pinctrl-names = "default";
+};
+
+&sercom0 {
+	status = "okay";
+	compatible = "atmel,sam0-spi";
+	dipo = <0>;
+	dopo = <1>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	pinctrl-0 = <&sercom0_default>;
+	pinctrl-names = "default";
+};
+
+&sercom1 {
+	status = "okay";
+	compatible = "atmel,sam0-uart";
+	current-speed = <115200>;
+	rxpo = <3>;
+	txpo = <0>;
+
+	pinctrl-0 = <&sercom1_default>;
+	pinctrl-names = "default";
+};
+
+&sercom2 {
+	status = "okay";
+	compatible = "atmel,sam0-i2c";
+	clock-frequency = <I2C_BITRATE_FAST>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	pinctrl-0 = <&sercom2_default>;
+	pinctrl-names = "default";
+};
+
+&sercom3 {
+	status = "okay";
+	compatible = "atmel,sam0-uart";
+	current-speed = <115200>;
+	rxpo = <1>;
+	txpo = <0>;
+
+	pinctrl-0 = <&sercom3_default>;
+	pinctrl-names = "default";
+};
+
+&sercom4 {
+	status = "okay";
+	compatible = "atmel,sam0-uart";
+	current-speed = <115200>;
+	rxpo = <1>;
+	txpo = <0>;
+
+	pinctrl-0 = <&sercom4_default>;
+	pinctrl-names = "default";
+};
+
+&sercom5 {
+	status = "okay";
+	compatible = "atmel,sam0-spi";
+	dipo = <0>;
+	dopo = <1>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	pinctrl-0 = <&sercom5_default>;
+	pinctrl-names = "default";
+};
+
+zephyr_udc0: &usb0 {
+	status = "okay";
+};

boards/arm/atsaml21_xpro/atsaml21_xpro.yaml

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+# Copyright (c) 2021 Argentum Systems Ltd.
+# SPDX-License-Identifier: Apache-2.0
+identifier: atsaml21_xpro
+name: SAM L21 Xplained Pro
+type: mcu
+arch: arm
+ram: 32
+flash: 256
+toolchain:
+  - zephyr
+  - gnuarmemb
+  - xtools
+supported:
+  - adc
+  - counter
+  - dma
+  - gpio
+  - i2c
+  - pwm
+  - spi
+  - usb_cdc
+  - usb_device
+  - watchdog

boards/arm/atsaml21_xpro/atsaml21_xpro_defconfig

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+# Copyright (c) 2021 Argentum Systems Ltd.
+# SPDX-License-Identifier: Apache-2.0
+CONFIG_SOC_SERIES_SAML21=y
+CONFIG_SOC_PART_NUMBER_SAML21J18B=y
+CONFIG_BOARD_ATSAML21_XPRO=y
+CONFIG_BUILD_OUTPUT_HEX=y
+CONFIG_CORTEX_M_SYSTICK=y
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+CONFIG_SERIAL=y
+CONFIG_UART_SAM0=y
+CONFIG_UART_INTERRUPT_DRIVEN=y
+CONFIG_GPIO=y
+CONFIG_GPIO_SAM0=y
+CONFIG_SOC_ATMEL_SAML_XOSC32K=y
+CONFIG_SOC_ATMEL_SAML_XOSC32K_AS_MAIN=y

boards/arm/atsaml21_xpro/board.cmake

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+# Copyright (c) 2021 Argentum Systems Ltd.
+# SPDX-License-Identifier: Apache-2.0
+
+include(${ZEPHYR_BASE}/boards/common/openocd.board.cmake)