Linux preempt-rt

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/*
 * Copyright (c) 2020 Sebastian Schwabe <sebastian.schwabe@mailbox.tu-dresden.de>
 *                    Fabian Paschke <fabian.paschke@eas.iis.fraunhofer.de>
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/dts-v1/;
#include <st/f3/stm32f303X8.dtsi>
#include <st/f3/stm32f303k(6-8)tx-pinctrl.dtsi>

/ {
	model = "STMicroelectronics STM32F303K8-NUCLEO board";
	compatible = "st,stm32f303k8-nucleo";

	chosen {
		zephyr,console = &usart2;
		zephyr,shell-uart = &usart2;
		zephyr,sram = &sram0;
		zephyr,flash = &flash0;
	};

	leds {
		compatible = "gpio-leds";
		green_led_3: green_led_3 {
			gpios = <&gpiob 3 GPIO_ACTIVE_HIGH>;
			label = "LD3";
		};
	};
	pwmleds {
		compatible = "pwm-leds";
		green_pwm_led: green_pwm_led {
			pwms = <&pwm2 2 0 PWM_POLARITY_NORMAL>;
		};
	};

	aliases {
		led0 = &green_led_3;
		pwm-led0 = &green_pwm_led;
	};
};

&clk_hsi {
	status = "okay";
};

&pll {
	prediv = <1>;
	mul = <9>;
	clocks = <&clk_hsi>;
	status = "okay";
};

&rcc {
	clocks = <&pll>;
	clock-frequency = <DT_FREQ_M(72)>;
	ahb-prescaler = <1>;
	apb1-prescaler = <2>;
	apb2-prescaler = <1>;
};

&timers2 {
	status = "okay";

	pwm2: pwm {
		status = "okay";
		pinctrl-0 = <&tim2_ch2_pb3>;
	};
};

&usart2 {
	pinctrl-0 = <&usart2_tx_pa2 &usart2_rx_pa15>;
	current-speed = <115200>;
	status = "okay";
};

&i2c1 {
	pinctrl-0 = <&i2c1_scl_pb6 &i2c1_sda_pb7>;
	status = "okay";
	clock-frequency = <I2C_BITRATE_FAST>;
};

&spi1 {
	pinctrl-0 = <&spi1_nss_pa4 &spi1_sck_pa5
		     &spi1_miso_pa6 &spi1_mosi_pa7>;
	status = "okay";
};

&adc1 {
	pinctrl-0 = <&adc1_in1_pa0>;
	status = "okay";
};

&rtc {
	status = "okay";
};