Linux preempt-rt

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/*
 * Copyright (c) 2021 Guðni Már Gilbert
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/dts-v1/;
#include <st/l4/stm32l412XB.dtsi>
#include <st/l4/stm32l412rbtx-pinctrl.dtsi>
#include "arduino_r3_connector.dtsi"

/ {
	model = "STMicroelectronics STM32L412RB-P-NUCLEO board";
	compatible = "st,stm32l412rb-p-nucleo";

	chosen {
		zephyr,console = &lpuart1;
		zephyr,shell-uart = &lpuart1;
		zephyr,sram = &sram0;
		zephyr,flash = &flash0;
	};

	leds {
		compatible = "gpio-leds";
		green_led: led_0 {
			gpios = <&gpiob 13 GPIO_ACTIVE_HIGH>;
			label = "User LD4";
		};
	};

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

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

&clk_hsi {
	status = "okay";
};

&pll {
	div-m = <1>;
	mul-n = <10>;
	div-q = <2>;
	div-r = <2>;
	clocks = <&clk_hsi>;
	status = "okay";
};

&rcc {
	clocks = <&pll>;
	clock-frequency = <DT_FREQ_M(80)>;
	ahb-prescaler = <1>;
	apb1-prescaler = <1>;
	apb2-prescaler = <1>;
};

&lpuart1 {
	pinctrl-0 = <&lpuart1_tx_pa2 &lpuart1_rx_pa3>;
	current-speed = <115200>;
	status = "okay";
};

&usart1 {
	pinctrl-0 = <&usart1_tx_pa9 &usart1_rx_pa10>;
	current-speed = <115200>;
};

&spi2 {
	pinctrl-0 = <&spi2_sck_pb13 &spi2_miso_pb14 &spi2_mosi_pb15>;
	cs-gpios = <&gpioa 11 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
	status = "okay";
};

&i2c1 {
	pinctrl-0 = <&i2c1_scl_pb8 &i2c1_sda_pb7>;
	clock-frequency = <I2C_BITRATE_FAST>;
	status = "okay";
};

&timers2 {
	status = "okay";

	pwm2: pwm {
		status = "okay";
		pinctrl-0 = <&tim2_ch1_pa0>;
	};
};

&rtc {
	status = "okay";
};

&adc1 {
	pinctrl-0 = <&adc1_in5_pa0>;
	status = "okay";
};

&lptim1 {
	status = "okay";
};

&flash0 {
	partitions {
		compatible = "fixed-partitions";
		#address-cells = <1>;
		#size-cells = <1>;

		/*
		 * Reserve the final 16 KiB for file system partition
		 * 128 KiB --> 131702 bytes
		 * 16 KiB  --> 16384 bytes
		 * Start Addr = 131702 - 16384 --> (HEX) 0x0001c276
		 * Size = 16384 --> (HEX) 0x00004000
		 */
		storage_partition: partition@1c276 {
			label = "storage";
			reg = <0x0001c276 0x00004000>;
		};
	};
};