Linux preempt-rt

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/*
 * Copyright (c) 2020 Brian Bradley <brian.bradley.p@gmail.com>
 * Copyright (c) 2021 Kalyan Sriram <coder.kalyan@gmail.com>
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/dts-v1/;
#include <st/f4/stm32f411Xe.dtsi>
#include <st/f4/stm32f411c(c-e)ux-pinctrl.dtsi>

/ {
	model = "WeAct Studio Black Pill V2.0 Board";
	compatible = "weact,blackpill-f411ce";

	chosen {
		zephyr,console = &usart1;
		zephyr,shell-uart = &usart1;
		zephyr,sram = &sram0;
		zephyr,flash = &flash0;
	};

	leds {
		compatible = "gpio-leds";
		user_led: led {
			gpios = <&gpioc 13 GPIO_ACTIVE_LOW>;
			label = "User LED";
		};
	};

	gpio_keys {
		compatible = "gpio-keys";
		user_button: button {
			label = "KEY";
			gpios = <&gpioa 0 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
		};
	};

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

&flash0 {

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

		boot_partition: partition@0 {
			label = "mcuboot";
			reg = <0x00000000 0x00008000>;
			read-only;
		};

		/*
		 * The flash starting at offset 0x00008000 and ending at
		 * offset 0x0001ffff (sectors 2 through 4) is reserved for
		 * use by the application.
		 */

		slot0_partition: partition@20000 {
			label = "image-0";
			reg = <0x00020000 0x00020000>;
		};
		slot1_partition: partition@40000 {
			label = "image-1";
			reg = <0x00040000 0x00020000>;
		};
		scratch_partition: partition@60000 {
			label = "image-scratch";
			reg = <0x00060000 0x00020000>;
		};
	};
};

&timers4 {
	status = "okay";

	pwm4: pwm {
		status = "okay";
		pinctrl-0 = <&tim4_ch1_pb6 &tim4_ch2_pb7>;
	};
};

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

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

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

&rtc {
	status = "okay";
};

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

&adc1 {
	pinctrl-0 = <&adc1_in1_pa1>;
	status = "okay";
};

&clk_hse {
	clock-frequency = <DT_FREQ_M(25)>;
	status = "okay";
};

&pll {
	div-m = <25>;
	mul-n = <192>;
	div-p = <2>;
	div-q = <4>;
	clocks = <&clk_hse>;
	status = "okay";
};

&rcc {
	clocks = <&pll>;
	clock-frequency = <DT_FREQ_M(96)>;
	ahb-prescaler = <1>;
	apb1-prescaler = <2>;
	apb2-prescaler = <1>;
};