Linux preempt-rt

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/*
 * Copyright (c) 2017 Linaro Limited
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/dts-v1/;
#include <st/l4/stm32l476Xg.dtsi>
#include <st/l4/stm32l476r(c-e-g)tx-pinctrl.dtsi>
#include "arduino_r3_connector.dtsi"

/ {
	model = "STMicroelectronics STM32L476RG-NUCLEO board";
	compatible = "st,stm32l476rg-nucleo";

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

	power-states {
		stop0: state0 {
			compatible = "zephyr,power-state";
			power-state-name = "suspend-to-idle";
			substate-id = <1>;
			min-residency-us = <500>;
		};
		stop1: state1 {
			compatible = "zephyr,power-state";
			power-state-name = "suspend-to-idle";
			substate-id = <2>;
			min-residency-us = <700>;
		};
		stop2: state2 {
			compatible = "zephyr,power-state";
			power-state-name = "suspend-to-idle";
			substate-id = <3>;
			min-residency-us = <1000>;
		};
	};

	leds {
		compatible = "gpio-leds";
		green_led_2: led_2 {
			gpios = <&gpioa 5 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_hsi {
	status = "okay";
};

&pll {
	div-m = <1>;
	mul-n = <20>;
	div-r = <4>;
	clocks = <&clk_hsi>;
	status = "okay";
};

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

&cpu0 {
	cpu-power-states = <&stop0 &stop1 &stop2>;
};

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

&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>;
};

&i2c1 {
	pinctrl-0 = <&i2c1_scl_pb8 &i2c1_sda_pb9>;
	status = "okay";
	clock-frequency = <I2C_BITRATE_FAST>;
};

&i2c3 {
	pinctrl-0 = <&i2c3_scl_pc0 &i2c3_sda_pc1>;
	status = "okay";
	clock-frequency = <I2C_BITRATE_FAST>;
};

&spi1 {
	pinctrl-0 = <&spi1_sck_pa5 &spi1_miso_pa6 &spi1_mosi_pa7>;
	cs-gpios = <&gpiob 6 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
	status = "okay";
};

&spi2 {
	pinctrl-0 = <&spi2_nss_pb12 &spi2_sck_pb13
		     &spi2_miso_pb14 &spi2_mosi_pb15>;
	status = "okay";
};

&spi3 {
	/* SPI3 on the ST Morpho Connector CN7 pins 17, 1, 2, 3*/
	pinctrl-0 = <&spi3_nss_pa15 &spi3_sck_pc10
		     &spi3_miso_pc11 &spi3_mosi_pc12>;
	status = "okay";
};

&timers2 {
	status = "okay";

	pwm2: pwm {
		status = "okay";
		pinctrl-0 = <&tim2_ch3_pb10>;
	};
};

&timers3 {
	status = "okay";

	pwm3: pwm {
		status = "okay";
		st,prescaler = <10000>;
		pinctrl-0 = <&tim3_ch1_pb4>;
	};
};

&rtc {
	status = "okay";
};

&adc1 {
	pinctrl-0 = <&adc1_in1_pc0>;
	status = "okay";
};