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1Dallas DS1307 and compatible RTC
2
3Required properties:
4- compatible: should be one of:
5	"dallas,ds1307",
6	"dallas,ds1308",
7	"dallas,ds1337",
8	"dallas,ds1338",
9	"dallas,ds1339",
10	"dallas,ds1388",
11	"dallas,ds1340",
12	"dallas,ds1341",
13	"maxim,ds3231",
14	"st,m41t0",
15	"st,m41t00",
16	"st,m41t11",
17	"microchip,mcp7940x",
18	"microchip,mcp7941x",
19	"pericom,pt7c4338",
20	"epson,rx8025",
21	"isil,isl12057"
22- reg: I2C bus address of the device
23
24Optional properties:
25- interrupts: rtc alarm interrupt.
26- clock-output-names: From common clock binding to override the default output
27                      clock name
28- wakeup-source: Enables wake up of host system on alarm
29- trickle-resistor-ohms : ds1339, ds1340 and ds 1388 only
30	Selected resistor for trickle charger
31	Possible values are 250, 2000, 4000
32	Should be given if trickle charger should be enabled
33- trickle-diode-disable : ds1339, ds1340 and ds 1388 only
34	Do not use internal trickle charger diode
35	Should be given if internal trickle charger diode should be disabled
36
37Example:
38	rtc1: ds1339@68 {
39		compatible = "dallas,ds1339";
40		reg = <0x68>;
41		interrupt-parent = <&gpio4>;
42		interrupts = <20 0>;
43		trickle-resistor-ohms = <250>;
44	};
45