tests/drivers/regulator/voltage/boards/rpi_pico.overlay

/*
 * Copyright (c) 2023 TOKITA Hiroshi <tokita.hiroshi@fujitsu.com>
 * SPDX-License-Identifier: Apache-2.0
 */

/ {
        /* NOTE: It is necessary to connect VREG_OUT to the ADC to perform the test.
	 * But the rpi_pico board and most boards that use the rp2040, VREG_OUT and
	 * DVDD are directly connected, and no available exposed trace on the board.
	 *
	 * In the rpi_pico board, a short, thick, diagonal wiring pattern near the 3x3
	 * thermal via connect to VREG_OUT. (Around between C and E of CE mark of silk print.)
	 * Scraping the resist on there and soldering wire to make it able to measure by ADC.
	 */
	resources: resources {
		compatible = "test-regulator-voltage";
		regulators = <&vreg>;
		io-channels = <&adc 0>;
		tolerance-microvolt = <50000>;
		set-read-delay-ms = <10>;
		adc-avg-count = <10>;
		min-microvolt = <850000>;
	};
};

&vreg {
	raspberrypi,brown-out-threshold = <473000>;
};

&adc {
	#address-cells = <1>;
	#size-cells = <0>;

	channel@0 {
		reg = <0>;
		zephyr,gain = "ADC_GAIN_1";
		zephyr,reference = "ADC_REF_INTERNAL";
		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
		zephyr,resolution = <12>;
	};
};