Linux preempt-rt

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/*
 * Copyright (c) 2018, Reto Schneider <code@reto-schneider.ch>
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/dts-v1/;
#include <st/f4/stm32f407Xg.dtsi>
#include <st/f4/stm32f407z(e-g)tx-pinctrl.dtsi>

/ {
	model = "Olimex STM32-H407 board";
	compatible = "olimex,stm32-h407";

	chosen {
		zephyr,console = &usart2;
		zephyr,shell-uart = &usart2;
		zephyr,sram = &sram0;
		zephyr,flash = &flash0;
		zephyr,ccm = &ccm0;
	};

	leds {
		compatible = "gpio-leds";
		green_led_2: led_2 {
			gpios = <&gpioa 0 GPIO_ACTIVE_HIGH>;
			label = "User LD2";
		};
	};

	gpio_keys {
		compatible = "gpio-keys";
		user_button: button {
			label = "User";
			gpios = <&gpioc 13 GPIO_ACTIVE_LOW>;
		};
	};

	aliases {
		led0 = &green_led_2;
		sw0 = &user_button;
	};
};

&clk_hse {
	clock-frequency = <DT_FREQ_M(12)>;
	status = "okay";
};

&pll {
	div-m = <6>;
	mul-n = <168>;
	div-p = <2>;
	div-q = <7>;
	clocks = <&clk_hse>;
	status = "okay";
};

&rcc {
	clocks = <&pll>;
	clock-frequency = <DT_FREQ_M(168)>;
	ahb-prescaler = <1>;
	apb1-prescaler = <4>;
	apb2-prescaler = <2>;
};

&usart2 {
	pinctrl-0 = <&usart2_tx_pa2 &usart2_rx_pa3>;
	current-speed = <115200>;
	status = "okay";
};

&usart3 {
	pinctrl-0 = <&usart3_tx_pb10 &usart3_rx_pb11>;
	current-speed = <115200>;
	status = "okay";
};

&usart6 {
	pinctrl-0 = <&usart6_tx_pc6 &usart6_rx_pc7>;
	current-speed = <115200>;
	status = "okay";
};

&rtc {
	status = "okay";
};

&rng {
	status = "okay";
};

&usbotg_fs {
	pinctrl-0 = <&usb_otg_fs_dm_pa11 &usb_otg_fs_dp_pa12>;
};