The RV8901 RTC chip provides a function to store timestamp events.
There are three input pins (EVIN1-3) available for triggering.
The timestamp can be read to detect tamper alerts, for example.
This patch series extends the sysfs interface to enable and read the
timestamp events.
The data-sheet can be found here:
https://download.epsondevice.com/td/pdf/brief/RX8901CE_en.pdf
Changes in V4:
* fix warning in dt-binding
* reformat
* fix flags reset on read
* auto enable if configured in device-tree
* rebase to linux-6.15~rc1
Changes in V3:
* change permission for sysfs read to admin
* add device-tree bindings for event pin and buffer mode configuration
Changes in V2:
* remove separate patch for register definitions
* remove pin configuration over sysfs (use default settings)
* add sysfs documentation
* rework enable to simplify and remove big mutext scope
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[V1] https://lore.kernel.org/lkml/20250110061401.358371-1-markus.burri@mt.com/
[V2] https://lore.kernel.org/lkml/20250116131532.471040-1-markus.burri@mt.com/
[V3] https://lore.kernel.org/lkml/20250513161922.4064-1-markus.burri@mt.com/
Markus Burri (7):
dt-bindings: rtc: add new type for epson,rx8901
rtc-rv8803: add new type for rv8901
rtc-rv8803: add tamper function to sysfs for rv8901
rtc-rv8803: extend sysfs to trigger internal ts-event
rtc-rv8803: extend sysfs to read status
dt-bindings: rtc-rv8803: add tamper detection property node
rtc-rv8803: make tamper function configurable via dt
.../ABI/testing/sysfs-class-rtc-tamper | 36 +
.../devicetree/bindings/rtc/epson,rx8900.yaml | 39 +-
drivers/rtc/rtc-rv8803.c | 639 +++++++++++++++++-
3 files changed, 709 insertions(+), 5 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-class-rtc-tamper
base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8
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2.39.5