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author | Sam Ravnborg <sam@ravnborg.org> | 2019-01-19 10:00:29 +0100 |
---|---|---|
committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2019-01-22 18:57:06 +0100 |
commit | e4a604cbee5470fc116ac9a4f852152070984286 (patch) | |
tree | b454cc8fcf4743f8364b8faa84b5a8e87415a050 /Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt | |
parent | 8c12af15e7340a14e2978814ef28df58962283d6 (diff) | |
download | linux-e4a604cbee5470fc116ac9a4f852152070984286.tar.bz2 |
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: Søren Andersen <san@skov.dk>
Signed-off-by: Sam 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: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt')
-rw-r--r-- | Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt b/Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt new file mode 100644 index 000000000000..d3e380ad712d --- /dev/null +++ b/Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt @@ -0,0 +1,18 @@ +* 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>; +}; |