NVIDIA Tegra20 real-time clock

The Tegra RTC maintains seconds and milliseconds counters, and five alarm
registers. The alarms and other interrupts may wake the system from low-power
state.

Required properties:

- compatible : For Tegra20, must contain "nvidia,tegra20-rtc".  Otherwise,
  must contain '"nvidia,<chip>-rtc", "nvidia,tegra20-rtc"', where <chip>
  can be tegra30, tegra114, tegra124, or tegra132.
- reg : Specifies base physical address and size of the registers.
- interrupts : A single interrupt specifier.
- clocks : Must contain one entry, for the module clock.
  See ../clocks/clock-bindings.txt for details.

Example:

timer {
	compatible = "nvidia,tegra20-rtc";
	reg = <0x7000e000 0x100>;
	interrupts = <0 2 0x04>;
	clocks = <&tegra_car 4>;
};
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