From: Søren Andersen <redacted>

The NXP pcf85063 support two different quartz loads.
- 7 pF (default)
- 12.5 pF (minimum power consumption)

The pcf85063 needs to know the size of the external capacitor,
otherwise the RTC will have a bad precision (hours/week).

The power-on default is 7 pF
Add a property that tells if the external capacitor is 12.5 pF

Signed-off-by: Søren Andersen <redacted>
Signed-off-by: Sam Ravnborg <redacted>
Cc: Alessandro Zummo <redacted>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
---
 .../devicetree/bindings/rtc/nxp,pcf85063.txt          | 19 +++++++++++++++++++
 Documentation/devicetree/bindings/trivial-devices.txt |  1 -
 2 files changed, 19 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..22ebb2ce52c1
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt

@@ -0,0 +1,19 @@
+* NXP PCF85063 Real Time Clock
+
+NXP PCF85063 Real Time Clock
+
+Required properties:
+- compatible: Should contain "nxp,pcf85063".
+- reg: I2C address for chip.
+
+Optional property:
+- nxp,quartz_load_12.5pF: The capacitive load on the quartz is 12.5 pF,
+  which differ from the default value of 7 pF
+
+Example:
+
+pcf85063: pcf85063@51 {
+	compatible = "nxp,pcf85063";
+	reg = <0x51>;
+	nxp,quartz_load_12.5pF;