Message ID | 20230215081815.3141776-1-javier.carrasco@wolfvision.net |
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pcf85363: support for quartz-load-femtofarads
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Message
Javier Carrasco
Feb. 15, 2023, 8:18 a.m. UTC
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
Comments
On Wed, 15 Feb 2023 09:18:13 +0100, Javier Carrasco wrote: > 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). > > [...] Applied, thanks! [1/2] dt-bindings: rtc: nxp,pcf8563: move pcf85263/pcf85363 to a dedicated binding commit: 1b2f85a8bac67b9909f2ee4be1bc11548a7aeaf3 [2/2] rtc: pcf85363: add support for the quartz-load-femtofarads property commit: fd9a6a13949af81062f4cd04f2c1b28ca5311e71 Best regards,