tests/subsys/pm/device_power_domains/app.overlay

/ {
	test_reg_0: test_reg_0 {
		compatible = "power-domain-gpio";
		enable-gpios = <&gpio0 0 0>;
	};

	test_reg_1: test_reg_1 {
		compatible = "power-domain-gpio";
		enable-gpios = <&gpio0 1 0>;
	};

	test_reg_chained: test_reg_chained {
		compatible = "power-domain-gpio";
		enable-gpios = <&gpio0 2 0>;
		power-domain = <&test_reg_0>;
	};
};