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Subject[PATCH v2 3/5] dt-binding: pcf85063: add xtal load capacitance
Date
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>
---
Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt | 18 ++++++++++++++++++
Documentation/devicetree/bindings/rtc/rtc.txt | 1 -
2 files changed, 18 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt

diff --git a/Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt b/Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt
new file mode 100644
index 000000000000..ad5e8eaa370e
--- /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: pcf85063@51 {
+ compatible = "nxp,pcf85063";
+ reg = <0x51>;
+ quartz-load-femtofarads = <12500>;
+};
diff --git a/Documentation/devicetree/bindings/rtc/rtc.txt b/Documentation/devicetree/bindings/rtc/rtc.txt
index e07b15d151ac..efac6dc5b914 100644
--- a/Documentation/devicetree/bindings/rtc/rtc.txt
+++ b/Documentation/devicetree/bindings/rtc/rtc.txt
@@ -52,7 +52,6 @@ microcrystal,rv3029 Real Time Clock Module with I2C-Bus
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
--
2.12.0
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