Messages in this thread | | | From | Javier Carrasco <> | Subject | [PATCH v2 0/2] pcf85363: support for quartz-load-femtofarads | Date | Wed, 15 Feb 2023 09:18:13 +0100 |
| |
These patches add support for the quartz-load-femtofarads property in the pcf85363 device driver and new bindings for the pcf85263 and pcf85363 Real Time Clocks.
The driver has been tested with a PCF85263ATT RTC and a CTS3-32.768-12.5-20 oscillator that needs a 12.5 pF load capacitor. With no property support the 7 pF default value leads to at least 2 Hz output frequency deviations, while setting the right value the deviation decreased to 0.15 Hz. These measurements were made with a high precision oscilloscope (SIGLENT SDS5104X).
This modification does not affect existing designs where the quartz-load-femtofarads is not defined because in that case the default value is used.
Javier Carrasco (2): dt-bindings: rtc: nxp,pcf8563: move pcf85263/pcf85363 to a dedicated binding rtc: pcf85363: add support for the quartz-load-femtofarads property
.../devicetree/bindings/rtc/nxp,pcf85363.yaml | 60 +++++++++++++++++++ .../devicetree/bindings/rtc/nxp,pcf8563.yaml | 2 - drivers/rtc/rtc-pcf85363.c | 37 +++++++++++- 3 files changed, 96 insertions(+), 3 deletions(-) create mode 100644 Documentation/devicetree/bindings/rtc/nxp,pcf85363.yaml
-- 2.37.2
| |