u-boot/test/dm/test.dts

/dts-v1/;

/ {
	model = "sandbox";
	compatible = "sandbox";
	#address-cells = <1>;
	#size-cells = <0>;

	a-test {
		reg = <0>;
		compatible = "denx,u-boot-fdt-test";
		ping-add = <0>;
	};

	junk {
		reg = <1>;
		compatible = "not,compatible";
	};

	no-compatible {
		reg = <2>;
	};

	b-test {
		reg = <3>;
		compatible = "denx,u-boot-fdt-test";
		ping-add = <3>;
	};

	some-bus {
		#address-cells = <1>;
		#size-cells = <0>;
		reg = <4>;
		ping-add = <4>;
		c-test {
			compatible = "denx,u-boot-fdt-test";
			reg = <5>;
			ping-add = <5>;
		};
	};

	d-test {
		reg = <6>;
		ping-add = <6>;
		compatible = "google,another-fdt-test";
	};

	base-gpios {
		compatible = "sandbox,gpio";
		gpio-bank-name = "a";
		num-gpios = <20>;
	};

	extra-gpios {
		compatible = "sandbox,gpio";
		gpio-bank-name = "b";
		num-gpios = <10>;
	};
};