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 "epson,rx8130" 23- reg: I2C bus address of the device 24 25Optional properties: 26- interrupts: rtc alarm interrupt. 27- clock-output-names: From common clock binding to override the default output 28 clock name 29- wakeup-source: Enables wake up of host system on alarm 30- trickle-resistor-ohms : ds1339, ds1340 and ds 1388 only 31 Selected resistor for trickle charger 32 Possible values are 250, 2000, 4000 33 Should be given if trickle charger should be enabled 34- trickle-diode-disable : ds1339, ds1340 and ds 1388 only 35 Do not use internal trickle charger diode 36 Should be given if internal trickle charger diode should be disabled 37 38Example: 39 ds1339: rtc@68 { 40 compatible = "dallas,ds1339"; 41 reg = <0x68>; 42 interrupt-parent = <&gpio4>; 43 interrupts = <20 0>; 44 trickle-resistor-ohms = <250>; 45 }; 46