linux-kernel - [PATCH 0/4] rtc:abx80x: Enable distributed digital calibration

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Date:   Mon, 29 Mar 2021 00:02:28 +0300
From:   Kirill Kapranov <kirill.kapranov@...pulab.co.il>
To:     a.zummo@...ertech.it, alexandre.belloni@...tlin.com,
        phdm@...qel.be, linux-rtc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Kirill Kapranov <kirill.kapranov@...pulab.co.il>
Subject: [PATCH 0/4] rtc:abx80x: Enable distributed digital calibration

This patch series enables a Distributed Digital Calibration function for
the RTC of the family. This feature allows to improve the RTC accuracy by
means of compensation an XT oscillator drift. To learn more, see:
AB08XX Series Ultra Low Power RTC IC User's Guide
https://abracon.com/realtimeclock/AB08XX-Application-Manual.pdf

The patches 1 and 2 enable SQW output, that is necessary for subsequent
measurement and computation. However, this feature may be enabled and used
independently, as is.

The patches 3 and 4 enable the XT calibration feature per se. The SQW
output must be enabled for usage of this feature.

TIA!
Kirill

Kirill Kapranov (4):
  dt-bindings: rtc: abracon,abx80x: Add sqw property
  rtc:abx80x: Enable SQW output
  dt-bindings: rtc: abracon,abx80x: Add xt-frequency property
  rtc:abx80x: Enable xt digital calibration

 .../devicetree/bindings/rtc/abracon,abx80x.txt |  25 ++
 drivers/rtc/rtc-abx80x.c                       | 252 +++++++++++++++++++++
 2 files changed, 277 insertions(+)

-- 
2.11.0