* APM X-Gene Real Time ClockRTC controller for the APM X-Gene Real Time ClockRequired properties:- compatible : Should be "apm,xgene-rtc"- reg: physical base address of the controller and length of memory mapped region.- interrupts: IRQ line for the RTC.- #clock-cells: Should be 1.- clocks: Reference to the clock entry.Example:rtcclk: rtcclk { compatible = "fixed-clock"; #clock-cells = <1>; clock-frequency = <100000000>; clock-output-names = "rtcclk";};rtc: rtc@10510000 { compatible = "apm,xgene-rtc"; reg = <0x0 0x10510000 0x0 0x400>; interrupts = <0x0 0x46 0x4>; #clock-cells = <1>; clocks = <&rtcclk 0>;};