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The NXP pcf8523 supports two different xtal load capacitance - 7000fF (7pF) HW default - 12500fF (12.5pF) Minimum power consumption, driver default To obtain a precise RTC the pcf8523 must be configured with the correct capacitance load of the xtal. Add a property to specify the xtal capacitance load. The default value matches that of the current Linux driver. With a dedicated binding remove the entry in rtc.txt Signed-off-by: Søren Andersen <san@skov.dk> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Reviewed-by: Rob Herring <robh@kernel.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
70 lines
3.1 KiB
Plaintext
70 lines
3.1 KiB
Plaintext
Generic device tree bindings for Real Time Clock devices
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========================================================
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This document describes generic bindings which can be used to describe Real Time
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Clock devices in a device tree.
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Required properties
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-------------------
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- compatible : name of RTC device following generic names recommended practice.
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For other required properties e.g. to describe register sets,
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clocks, etc. check the binding documentation of the specific driver.
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Optional properties
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-------------------
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- start-year : if provided, the default hardware range supported by the RTC is
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shifted so the first usable year is the specified one.
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The following properties may not be supported by all drivers. However, if a
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driver wants to support one of the below features, it should adapt the bindings
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below.
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- trickle-resistor-ohms : Selected resistor for trickle charger. Should be given
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if trickle charger should be enabled
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- trickle-diode-disable : Do not use internal trickle charger diode Should be
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given if internal trickle charger diode should be
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disabled
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- wakeup-source : Enables wake up of host system on alarm
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- quartz-load-femtofarads : The capacitive load of the quartz(x-tal),
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expressed in femto Farad (fF).
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The default value shall be listed (if optional),
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and likewise all valid values.
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Trivial RTCs
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------------
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This is a list of trivial RTC devices that have simple device tree
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bindings, consisting only of a compatible field, an address and
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possibly an interrupt line.
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Compatible Vendor / Chip
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========== =============
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abracon,abb5zes3 AB-RTCMC-32.768kHz-B5ZE-S3: Real Time Clock/Calendar Module with I2C Interface
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dallas,ds1374 I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output
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dallas,ds1672 Dallas DS1672 Real-time Clock
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dallas,ds3232 Extremely Accurate I²C RTC with Integrated Crystal and SRAM
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epson,rx8010 I2C-BUS INTERFACE REAL TIME CLOCK MODULE
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epson,rx8581 I2C-BUS INTERFACE REAL TIME CLOCK MODULE
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emmicro,em3027 EM Microelectronic EM3027 Real-time Clock
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isil,isl1208 Intersil ISL1208 Low Power RTC with Battery Backed SRAM
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isil,isl1218 Intersil ISL1218 Low Power RTC with Battery Backed SRAM
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isil,isl12022 Intersil ISL12022 Real-time Clock
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microcrystal,rv3029 Real Time Clock Module with I2C-Bus
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microcrystal,rv8523 Real Time Clock
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nxp,pcf2127 Real-time clock
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nxp,pcf2129 Real-time clock
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nxp,pcf8563 Real-time clock/calendar
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nxp,pcf85063 Tiny Real-Time Clock
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pericom,pt7c4338 Real-time Clock Module
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ricoh,r2025sd I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
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ricoh,r2221tl I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
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ricoh,rs5c372a I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
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ricoh,rs5c372b I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
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ricoh,rv5c386 I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
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ricoh,rv5c387a I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
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sii,s35390a 2-wire CMOS real-time clock
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whwave,sd3078 I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
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