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Marvell Dove Power Management Unit interrupt controller

Required properties:
- compatible: shall be "marvell,dove-pmu-intc"
- reg: base address of PMU interrupt registers starting with CAUSE register
- interrupts: PMU interrupt of the main interrupt controller
- interrupt-controller: identifies the node as an interrupt controller
- #interrupt-cells: number of cells to encode an interrupt source, shall be 1

Example:
	pmu_intc: pmu-interrupt-ctrl@d0050 {
		compatible = "marvell,dove-pmu-intc";
		interrupt-controller;
		#interrupt-cells = <1>;
		reg = <0xd0050 0x8>;
		interrupts = <33>;
	};