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

Frieder Schrempf
2023-02-01T14:43:37Z

From: Frieder Schrempf <frieder.schrempf@kontron.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

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2.39.1