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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>
19 lines
446 B
Plaintext
19 lines
446 B
Plaintext
* NXP PCF8523 Real Time Clock
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Required properties:
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- compatible: Should contain "nxp,pcf8523".
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- reg: I2C address for chip.
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Optional property:
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- quartz-load-femtofarads: The capacitive load of the quartz(x-tal),
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expressed in femto Farad (fF). Valid values are 7000 and 12500.
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Default value (if no value is specified) is 12500fF.
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Example:
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pcf8523: rtc@68 {
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compatible = "nxp,pcf8523";
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reg = <0x68>;
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quartz-load-femtofarads = <7000>;
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};
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