ubuntu-linux-kernel/arch/arm64/boot/dts/arm/foundation-v8-psci.dtsi

/*
 * ARM Ltd.
 *
 * ARMv8 Foundation model DTS (PSCI configuration)
 */

/ {
	psci {
		compatible = "arm,psci-1.0";
		method = "smc";
	};
};

&cpu0 {
	enable-method = "psci";
};

&cpu1 {
	enable-method = "psci";
};

&cpu2 {
	enable-method = "psci";
};

&cpu3 {
	enable-method = "psci";
};