From: Søren Andersen <[email protected]> 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 <[email protected]> Signed-off-by: Sam Ravnborg <[email protected]> Cc: Alessandro Zummo <[email protected]> Cc: Alexandre Belloni <[email protected]> Cc: Rob Herring <[email protected]> Cc: Mark Rutland <[email protected]> --- .../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; +}; diff --git a/Documentation/devicetree/bindings/trivial-devices.txt b/Documentation/devicetree/bindings/trivial-devices.txt index 297dc82b67ad..440632682e31 100644 --- a/Documentation/devicetree/bindings/trivial-devices.txt +++ b/Documentation/devicetree/bindings/trivial-devices.txt @@ -170,7 +170,6 @@ nxp,pca9557 8-bit I2C-bus and SMBus I/O port with reset nxp,pcf2127 Real-time clock nxp,pcf2129 Real-time clock nxp,pcf8563 Real-time clock/calendar -nxp,pcf85063 Tiny Real-Time Clock oki,ml86v7667 OKI ML86V7667 video decoder ovti,ov5642 OV5642: Color CMOS QSXGA (5-megapixel) Image Sensor with OmniBSI and Embedded TrueFocus pericom,pt7c4338 Real-time Clock Module -- 2.12.0
