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 This series applies on 'linux-6.13~rc7' 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 --- [V1] https://lore.kernel.org/lkml/20250110061401.358371-1-markus.burri@xxxxxx/ Markus Burri (5): 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 .../ABI/testing/sysfs-class-rtc-tamper | 36 ++ .../devicetree/bindings/rtc/epson,rx8900.yaml | 2 + drivers/rtc/rtc-rv8803.c | 516 +++++++++++++++++- 3 files changed, 552 insertions(+), 2 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-class-rtc-tamper base-commit: 5bc55a333a2f7316b58edc7573e8e893f7acb532 -- 2.39.5
