Real Time Clock driver for:
  - Epson RX8900
  - Micro Crystal rv8803

Required properties:
- compatible: should be: "microcrystal,rv8803" or "epson,rx8900"
- reg : the I2C address of the device for I2C

Optional properties:
- epson,vdet-disable : boolean, if present will disable voltage detector.
  Should be set if no backup battery is used.
- trickle-diode-disable : boolean, if present will disable internal trickle
  charger diode

Example:

	rtc: rtc@32 {
		compatible = "epson,rx8900"
		reg = <0x32>;
		epson,vdet-disable;
		trickle-diode-disable;
	};