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* sun6i Real Time Clock

RTC controller for the Allwinner A31

Required properties:
- compatible	: Should be "allwinner,sun6i-a31-rtc"
- reg		: physical base address of the controller and length of
		  memory mapped region.
- interrupts	: IRQ lines for the RTC alarm 0 and alarm 1, in that order.

Example:

rtc: rtc@01f00000 {
	compatible = "allwinner,sun6i-a31-rtc";
	reg = <0x01f00000 0x54>;
	interrupts = <0 40 4>, <0 41 4>;
};