Linux preempt-rt

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

/dts-v1/;
#include <st/f4/stm32f401Xe.dtsi>
#include <st/f4/stm32f401r(d-e)tx-pinctrl.dtsi>
#include "96b_lscon.dtsi"

/ {
	model = "Seeed Studio Carbon 96boards";
	compatible = "seeed,carbon";

	chosen {
		zephyr,console = &usart1;
		zephyr,shell-uart = &usart1;
		zephyr,sram = &sram0;
		zephyr,flash = &flash0;
		zephyr,code-partition = &slot0_partition;
	};

	leds {
		compatible = "gpio-leds";
		green_led_1: led_1 {
			gpios = <&gpiod 2 GPIO_ACTIVE_HIGH>;
			label = "USR1 LED";
		};
		green_led_2: led_2 {
			gpios = <&gpioa 15 GPIO_ACTIVE_HIGH>;
			label = "USR2 LED";
		};
		bt_blue_led: led_3 {
			gpios = <&gpioa 15 GPIO_ACTIVE_HIGH>;
			label = "BT LED";
		};
	};

	gpio_keys {
		compatible = "gpio-keys";
		user_button: button {
			label = "User";
			gpios = <&gpiob 2 GPIO_ACTIVE_LOW>;
		};
	};

	aliases {
		led0 = &green_led_1;
		led1 = &green_led_2;
		led2 = &bt_blue_led;
		sw0 = &user_button;
	};
};

&clk_hse {
	clock-frequency = <DT_FREQ_M(16)>;
	status = "okay";
};

&pll {
	div-m = <16>;
	mul-n = <336>;
	div-p = <4>;
	div-q = <7>;
	clocks = <&clk_hse>;
	status = "okay";
};

&rcc {
	clocks = <&pll>;
	clock-frequency = <DT_FREQ_M(84)>;
	ahb-prescaler = <1>;
	apb1-prescaler = <2>;
	apb2-prescaler = <1>;
};

&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";
};

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

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

&i2c2 {
	pinctrl-0 = <&i2c2_scl_pb10 &i2c2_sda_pb3>;
	status = "okay";
	clock-frequency = <I2C_BITRATE_FAST>;
};

&spi1 {
	status = "okay";

	pinctrl-0 = <&spi1_miso_pa6 &spi1_mosi_pa7
		     &spi1_sck_pa5 &spi1_nss_pa4>;

	/* Nordic nRF51822-QFAC */
	bt-hci@0 {
		compatible = "zephyr,bt-hci-spi";
		reg = <0>;
		reset-gpios = <&gpiob 4 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
		irq-gpios = <&gpiob 1 GPIO_ACTIVE_HIGH>;
		spi-max-frequency = <2000000>;
		label = "BT_HCI";
	};
};

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

zephyr_udc0: &usbotg_fs {
	pinctrl-0 = <&usb_otg_fs_dm_pa11 &usb_otg_fs_dp_pa12>;
	status = "okay";
};

&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>;
		};
	};
};

&rtc {
	status = "okay";
};