RE: [PATCH 1/2] rtc/ia64: remove legacy efirtc driver

["Luck, Tony" <tony.luck@xxxxxxxxx>]

> arch/ia64 has a read_persistent_clock64() function, so it ends up reading
> the system time regardless of the RTC driver or CONFIG_RTC_HCTOSYS.
>
> As ia64 sets neither ARCH_HIBERNATION_POSSIBLE nor
> ARCH_SUSPEND_POSSIBLE, so we could just remove the
> read_persistent_clock64() and efi_gettimeofday(), relying instead
> on user space (/sbin/hwclock) or CONFIG_RTC_HCTOSYS.

Seems weird. ia64 has always assumed from day 1 that it is running
on a UEFI capable platorm (well at day 1 it was called "EFI", the "U"
came later).

So read_persistent_clock64() just calls EFI directly to get the time.

Seems simpler than worrying about having the right drivers and CONFIG
bits set.

-Tony