/* Pro Micro nRF52840 (nice!nano v2 compatible) + Adafruit SHT41 on a gated supply */
#include <zephyr/dt-bindings/adc/adc.h>
#include <zephyr/dt-bindings/adc/nrf-saadc.h>
#include <zephyr/dt-bindings/gpio/nordic-nrf-gpio.h>

/ {
	/* P0.17 powers the SHT41: switched on only while the sensor is in use */
	sens_pwr: sensor-power {
		compatible = "power-domain-gpio";
		enable-gpios = <&gpio0 17 (GPIO_ACTIVE_HIGH | NRF_GPIO_DRIVE_H0H1)>;
		startup-delay-us = <3000>;		/* SHT41 power-up + breakout caps */
		#power-domain-cells = <0>;
		zephyr,pm-device-runtime-auto;
	};

	zephyr,user {
		io-channels = <&adc 0>;
	};
};

/* DC/DC on REG0 (VDDH -> VDD) and REG1 (VDD -> core) */
&reg0 {
	status = "okay";
};

&reg1 {
	regulator-initial-mode = <NRF5X_REG_MODE_DCDC>;
};

/* I2C: SDA P0.20, SCL P0.22. "sleep" state = pins disconnected (no back-feeding) */
&pinctrl {
	sht_i2c_default: sht_i2c_default {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 0, 20)>, <NRF_PSEL(TWIM_SCL, 0, 22)>;
			bias-pull-up;
		};
	};

	sht_i2c_sleep: sht_i2c_sleep {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 0, 20)>, <NRF_PSEL(TWIM_SCL, 0, 22)>;
			low-power-enable;
		};
	};
};

&i2c0 {
	compatible = "nordic,nrf-twim";
	status = "okay";
	clock-frequency = <I2C_BITRATE_FAST>;
	pinctrl-0 = <&sht_i2c_default>;
	pinctrl-1 = <&sht_i2c_sleep>;
	pinctrl-names = "default", "sleep";
	zephyr,pm-device-runtime-auto;		/* bus enabled only during transfers */

	sht41: sht4x@44 {
		compatible = "sensirion,sht4x";
		reg = <0x44>;
		repeatability = <2>;			/* high precision, no heater */
		power-domains = <&sens_pwr>;
		zephyr,pm-device-runtime-auto;
	};
};

/* Battery: VDDH/5, internal 0.6 V ref, gain 1/2 -> 0..1.2 V range */
&adc {
	#address-cells = <1>;
	#size-cells = <0>;
	status = "okay";

	channel@0 {
		reg = <0>;
		zephyr,gain = "ADC_GAIN_1_2";
		zephyr,reference = "ADC_REF_INTERNAL";
		zephyr,acquisition-time = <ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 10)>;
		zephyr,input-positive = <NRF_SAADC_VDDHDIV5>;
		zephyr,resolution = <14>;		/* LSB = 6000 mV / 16384 = 0.37 mV at VDDH */
		zephyr,oversampling = <3>;		/* 2^3 = 8x */
	};
};

/* Unused board peripherals */
&i2c1 { status = "disabled"; };
&spi2 { status = "disabled"; };
&pwm0 { status = "disabled"; };
&uart0 { status = "disabled"; };
&usbd { status = "disabled"; };