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Commit e4a604cb authored by Sam Ravnborg's avatar Sam Ravnborg Committed by Alexandre Belloni
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dt-binding: pcf85063: add xtal load capacitance 



The NXP pcf85063 supports two different xtal load capacitance
- 7000fF  (7pF)    HW default, Linux driver default
- 12500fF (12.5pF) Minimum power consumption

To obtain a precise RTC the pcf85063 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: default avatarSøren Andersen <san@skov.dk>
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Urs Fässler <urs.fassler@bbv.ch>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 8c12af15

Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt

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+18 −0
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* NXP PCF85063 Real Time Clock



Required properties:

- compatible: Should contain "nxp,pcf85063".

- reg: I2C address for chip.



Optional property:

- quartz-load-femtofarads: The capacitive load of the quartz(x-tal),

  expressed in femto Farad (fF). Valid values are 7000 and 12500.

  Default value (if no value is specified) is 7000fF.



Example:



pcf85063: rtc@51 {

	compatible = "nxp,pcf85063";

	reg = <0x51>;

	quartz-load-femtofarads = <12500>;

};

Documentation/devicetree/bindings/rtc/rtc.txt

+0 −1
Original line number Diff line number Diff line
@@ -57,7 +57,6 @@ microcrystal,rv8523 Real Time Clock 
nxp,pcf2127		Real-time clock

nxp,pcf2129		Real-time clock

nxp,pcf8563		Real-time clock/calendar

nxp,pcf85063		Tiny Real-Time Clock

pericom,pt7c4338	Real-time Clock Module

ricoh,r2025sd		I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC

ricoh,r2221tl		I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC