The kernel people are not really happy with the patch to introduce the RTC auto calibration. The right way to go is using the existing code from the newer sunxi-ng source instead of adding the H616/H618 into the drivers/rtc/rtc-sun6i.c. I have to admit that I only partially understood the code in both places. Unfortunately the current code in drivers/clk/sunxi-ng/ccu-sun6i-rtc.c ends up with a completely unreliable box. Crashes and hangs during startup and only occasiona