linux-kernel - [PATCH v2 0/2] pcf85363: support for quartz-load-femtofarads

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Message-Id: <20230215081815.3141776-1-javier.carrasco@wolfvision.net>
Date:   Wed, 15 Feb 2023 09:18:13 +0100
From:   Javier Carrasco <javier.carrasco@...fvision.net>
To:     linux-rtc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Riesch <michael.riesch@...fvision.net>,
        Javier Carrasco <javier.carrasco@...fvision.net>
Subject: [PATCH v2 0/2] pcf85363: support for quartz-load-femtofarads

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