1 Generic device tree bindings for Real Time Clock devices
2 ========================================================
4 This document describes generic bindings which can be used to describe Real Time
5 Clock devices in a device tree.
10 - compatible : name of RTC device following generic names recommended practice.
12 For other required properties e.g. to describe register sets,
13 clocks, etc. check the binding documentation of the specific driver.
18 - start-year : if provided, the default hardware range supported by the RTC is
19 shifted so the first usable year is the specified one.
21 The following properties may not be supported by all drivers. However, if a
22 driver wants to support one of the below features, it should adapt the bindings
24 - trickle-resistor-ohms : Selected resistor for trickle charger. Should be given
25 if trickle charger should be enabled
26 - trickle-diode-disable : Do not use internal trickle charger diode Should be
27 given if internal trickle charger diode should be
29 - wakeup-source : Enables wake up of host system on alarm
30 - quartz-load-femtofarads : The capacitive load of the quartz(x-tal),
31 expressed in femto Farad (fF).
32 The default value shall be listed (if optional),
33 and likewise all valid values.
38 This is a list of trivial RTC devices that have simple device tree
39 bindings, consisting only of a compatible field, an address and
40 possibly an interrupt line.
43 Compatible Vendor / Chip
44 ========== =============
45 abracon,abb5zes3 AB-RTCMC-32.768kHz-B5ZE-S3: Real Time Clock/Calendar Module with I2C Interface
46 abracon,abeoz9 AB-RTCMC-32.768kHz-EOZ9: Real Time Clock/Calendar Module with I2C Interface
47 dallas,ds1374 I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output
48 dallas,ds1672 Dallas DS1672 Real-time Clock
49 dallas,ds3232 Extremely Accurate I²C RTC with Integrated Crystal and SRAM
50 epson,rx8010 I2C-BUS INTERFACE REAL TIME CLOCK MODULE
51 epson,rx8571 I2C-BUS INTERFACE REAL TIME CLOCK MODULE with Battery Backed RAM
52 epson,rx8581 I2C-BUS INTERFACE REAL TIME CLOCK MODULE
53 emmicro,em3027 EM Microelectronic EM3027 Real-time Clock
54 isil,isl1208 Intersil ISL1208 Low Power RTC with Battery Backed SRAM
55 isil,isl1218 Intersil ISL1218 Low Power RTC with Battery Backed SRAM
56 isil,isl12022 Intersil ISL12022 Real-time Clock
57 microcrystal,rv3028 Real Time Clock Module with I2C-Bus
58 microcrystal,rv3029 Real Time Clock Module with I2C-Bus
59 microcrystal,rv8523 Real Time Clock
60 nxp,pcf2127 Real-time clock
61 nxp,pcf2129 Real-time clock
62 nxp,pcf8563 Real-time clock/calendar
63 pericom,pt7c4338 Real-time Clock Module
64 ricoh,r2025sd I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
65 ricoh,r2221tl I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
66 ricoh,rs5c372a I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
67 ricoh,rs5c372b I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
68 ricoh,rv5c386 I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
69 ricoh,rv5c387a I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
70 sii,s35390a 2-wire CMOS real-time clock
71 whwave,sd3078 I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC