The PCF212x family is capable of sending interrupts when its value changes. The RTC core, on the other hand, relies on setting an alarm to the next second to get an Update Interrupt. This can sometimes fail, if the Alarm Flag is not cleared in time, causing a lost Update event. FYI the patches were made against the v6.8 tag. Csókás, Bence (2): rtc: Add UIE handling ability to rtc_class_ops rtc: pcf2127: Add UIE capability through Seconds Interrupt drivers/rtc/interface.c | 8 ++++++++ drivers/rtc/rtc-pcf2127.c | 24 ++++++++++++++++++++++++ include/linux/rtc.h | 1 + 3 files changed, 33 insertions(+) -- 2.34.1
