Hi, I hope this is the right list for my question. If not, please point me to a better list. Sometime at 2.6.8-2.6.9 kernel I needed a driver for the m41t11 RTC smbus chip. As there was none in the kernel at that time, I wrote it myself and made it available for user space as a misc device /dev/rtc (character dev 10 135). This way unmodified hwclock could access it. Now I noticed that latest kernels already contain the m41t00.c, which may well be able to drive my m41t11 RTC unmodified. However, it does not make the device available through /dev/rtc. Neither do that other few i2c RTCs currently in the kernel. They all seem to define their own ioctls each. What about making i2c RTCs available through /dev/rtc supporting its ioctls? If this would be OK then I can propose a patch for m41t00.c. Olav !! I'm not subscribed, please CC.