linux-kernel - [PATCH 0/7] Enable backup switch mode on RTCs via devicetree

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Message-Id: <20230201143431.863784-1-frieder@fris.de>
Date:   Wed,  1 Feb 2023 15:34:22 +0100
From:   Frieder Schrempf <frieder@...s.de>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-rtc@...r.kernel.org
Cc:     Frieder Schrempf <frieder.schrempf@...tron.de>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>
Subject: [PATCH 0/7] Enable backup switch mode on RTCs via devicetree

From: Frieder Schrempf <frieder.schrempf@...tron.de>

Some RTC devices like the RV3028 have BSM disabled as factory default.
This makes the RTC quite useless if it is expected to preserve the
time on hardware that has a battery-buffered supply for the RTC.

Let boards that have a buffered supply for the RTC force the BSM to the
desired value via devicetree by setting the 'backup-switch-mode' property.

That way the RTC on the boards work as one would expect them to do without
any per-board intervention through userspace tools to enable BSM.

Frieder Schrempf (7):
  dt-bindings: rtc: Move RV3028 to separate binding file
  dt-bindings: rtc: Add backup-switch-mode property
  dt-bindings: rtc: microcrystal,rv3032: Add backup-switch-mode property
  rtc: Move BSM defines to separate header for DT usage
  rtc: class: Support setting backup switch mode from devicetree
  arm64: dts: imx8mm-kontron: Remove useless trickle-diode-disable from
    RTC node
  arm64: dts: imx8mm-kontron: Enable backup switch mode for RTC on OSM-S
    module

 .../bindings/rtc/microcrystal,rv3028.yaml     | 60 +++++++++++++++++++
 .../devicetree/bindings/rtc/rtc.yaml          |  7 +++
 .../devicetree/bindings/rtc/trivial-rtc.yaml  |  2 -
 .../dts/freescale/imx8mm-kontron-osm-s.dtsi   |  3 +-
 drivers/rtc/class.c                           | 14 +++++
 include/dt-bindings/rtc/rtc.h                 | 11 ++++
 include/uapi/linux/rtc.h                      |  6 +-
 7 files changed, 95 insertions(+), 8 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/rtc/microcrystal,rv3028.yaml
 create mode 100644 include/dt-bindings/rtc/rtc.h

-- 
2.39.1