These patches add support for the quartz-load-femtofarads property in
the pcf85363 device driver and a description of the property's possible
values.
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):
rtc: pcf85363: add support for the quartz-load-femtofarads property
dt-bindings: rtc: nxp,pcf8563: add quartz-load-femtofarads for
pcf85263 and pcf85363
.../devicetree/bindings/rtc/nxp,pcf8563.yaml | 20 ++++++++--
drivers/rtc/rtc-pcf85363.c | 37 ++++++++++++++++++-
2 files changed, 53 insertions(+), 4 deletions(-)
--
2.37.2
Javier Carrasco
Research and Development
Wolfvision GmbH
Oberes Ried 14 | 6833 Klaus | Austria
Tel: +43 5523 52250 <tel:+43552352250> | Mail: javier.carrasco@xxxxxxxxxxxxxx <mailto:javier.carrasco@xxxxxxxxxxxxxx>
Website: wolfvision.com <www.wolfvision.com>
Firmenbuch / Commercial Register: FN283521v Feldkirch/Austria
