boards/arm/b_g474e_dpow1/b_g474e_dpow1.dts

/*
 * Copyright 2022 The Chromium OS Authors
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/dts-v1/;
#include <st/g4/stm32g474Xe.dtsi>
#include <st/g4/stm32g474r(b-c-e)tx-pinctrl.dtsi>

/ {
	model = "B-G474E-DPOW1 Discovery board";
	compatible = "st,b-g474e-dpow1";

	chosen {
		zephyr,console = &usart3;
		zephyr,shell-uart = &usart3;
		zephyr,sram = &sram0;
		zephyr,flash = &flash0;
	};

	leds {
		compatible = "gpio-leds";
		blue_led_2: led2 {
			gpios = <&gpioa 15 GPIO_ACTIVE_HIGH>;
			label = "LED_DOWN_BLUE";
		};
		orange_led_3: led3 {
			gpios = <&gpiob 1 GPIO_ACTIVE_HIGH>;
			label = "LED_LEFT_ORANGE";
		};
		green_led_4: led4 {
			gpios = <&gpiob 7 GPIO_ACTIVE_HIGH>;
			label = "LED_RIGHT_GREEN";
		};
		red_led_5: led5 {
			gpios = <&gpiob 5 GPIO_ACTIVE_HIGH>;
			label = "LED_UP_RED";
		};
	};

	gpio_keys {
		compatible = "gpio-keys";
		joystick_sel: button0 {
			label = "JOYSTICK_SEL";
			gpios = <&gpioc 13 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
		};
		joystick_left: button1 {
			label = "JOYSTICK_LEFT";
			gpios = <&gpioc 4 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
		};
		joystick_down: button2 {
			label = "JOYSTICK_DOWN";
			gpios = <&gpioc 5 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
		};
		joystick_right: button3 {
			label = "JOYSTICK_RIGHT";
			gpios = <&gpiob 2 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
		};
		joystick_up: button4 {
			label = "JOYSTICK_UP";
			gpios = <&gpiob 10 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
		};
	};

	aliases {
		led0 = &blue_led_2;
		led1 = &orange_led_3;
		led2 = &green_led_4;
		led3 = &red_led_5;
		sw0 = &joystick_sel;
		sw1 = &joystick_left;
		sw2 = &joystick_down;
		sw3 = &joystick_right;
		sw4 = &joystick_up;
		watchdog0 = &iwdg;
	};
};

&clk_hsi {
	status = "okay";
};

&pll {
	div-m = <1>;
	mul-n = <16>;
	div-p = <7>;
	div-q = <2>;
	div-r = <2>;
	clocks = <&clk_hsi>;
	status = "okay";
};

&rcc {
	clocks = <&pll>;
	clock-frequency = <DT_FREQ_M(128)>;
	ahb-prescaler = <1>;
	apb1-prescaler = <1>;
	apb2-prescaler = <1>;
};

&usart3 {
	pinctrl-0 = <&usart3_tx_pc10 &usart3_rx_pc11>;
	pinctrl-names = "default";
	current-speed = <115200>;
	status = "okay";
};

&iwdg {
	status = "okay";
};

&ucpd1 {
	status = "okay";

	/*
	 * UCPD is fed directly from HSI which is @ 16MHz. The ucpd_clk goes to
	 * a prescaler who's output feeds the 'half-bit' divider which is used
	 * to generate clock for delay counters and BMC Rx/Tx blocks. The rx is
	 * designed to work in freq ranges of 6 <--> 18 MHz, however recommended
	 * range is 9 <--> 18 MHz.
	 *
	 *          +-------+ @ 16 MHz +-------+   @ ~600 kHz   +-----------+
	 * HSI ---->| /psc  |--------->| /hbit |--------------->| trans_cnt |
	 *          +-------+          +-------+   |            +-----------+
	 *                                         |            +-----------+
	 *                                         +----------->| ifrgap_cnt|
	 *                                                      +-----------+
	 * Requirements:
	 *   1. hbit_clk ~= 600 kHz: 16 MHz / 600 kHz = 26.67
	 *   2. tTransitionWindow - 12 to 20 uSec
	 *   3. tInterframGap - uSec
	 *
	 * hbit_clk = HSI_clk / 27 = 592.6 kHz = 1.687 uSec period
	 * tTransitionWindow = 1.687 uS * 8 = 13.5 uS
	 * tInterFrameGap = 1.687 uS * 17 = 28.68 uS
	 */
	psc-ucpdclk = <1>;
	hbitclkdiv = <27>;
};

zephyr_udc0: &usb {
	pinctrl-0 = <&usb_dm_pa11 &usb_dp_pa12>;
	pinctrl-names = "default";
	status = "okay";
};