Linux preempt-rt

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/*
 * Copyright (c) 2019 Benjamin Valentin
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/dts-v1/;
#include <atmel/samr21.dtsi>

/ {
	model = "SAM R21 Xplained Pro";
	compatible = "atsamr21,xpro", "atmel,samr21g18a", "atmel,samr21";

	chosen {
		zephyr,console = &sercom0;
		zephyr,shell-uart = &sercom0;
		zephyr,sram = &sram0;
		zephyr,flash = &flash0;
	};

	/* These aliases are provided for compatibility with samples */
	aliases {
		led0 = &led0;
		sw0 = &user_button;
	};

	leds {
		compatible = "gpio-leds";
		led0: led_0 {
			gpios = <&porta 19 0>;
			label = "Yellow LED";
		};
	};

	buttons {
		compatible = "gpio-keys";
		user_button: button_0 {
			gpios = <&porta 28 (GPIO_PUD_PULL_UP | GPIO_INT_ACTIVE_LOW)>;
			label = "SW0";
		};
	};
};

&cpu0 {
	clock-frequency = <48000000>;
};

&sercom0 {
	status = "okay";
	compatible = "atmel,sam0-uart";
	current-speed = <115200>;
	rxpo = <1>;
	txpo = <0>;
};

&sercom1 {
	status = "okay";
	compatible = "atmel,sam0-i2c";
	clock-frequency = <I2C_BITRATE_FAST>;
	label = "I2C_0";
	#address-cells = <1>;
	#size-cells = <0>;
};

&sercom5 {
	status = "okay";
	compatible = "atmel,sam0-spi";
	dipo = <0>;
	dopo = <2>;
	label = "SPI_0";
	#address-cells = <1>;
	#size-cells = <0>;
};

&usb0 {
	status = "okay";
};

&rtc {
	status = "okay";
};