[rtc-linux] state of GEN_RTC vs rtc subsystem

Geoff Levand geoffrey.levand at am.sony.com
Sat May 31 08:45:40 EST 2008

Alessandro Zummo wrote:
> On Wed, 20 Feb 2008 10:11:23 -0600
> Kumar Gala <galak at kernel.crashing.org> wrote:
>> Is the functionality provided by drivers/char/gen_rtc.c completely  
>> handled by the rtc subsystem in drivers/rtc?
>> I ask for two reasons:
>> 1. should we make it mutually exclusive in Kconfig
>> 2. I've enabled both and get (we'll my defconfig did):
>  They shouldn't be enabled at once. I think a patch 
>  for Kconfig has been recently submitted to give a warning
>  in such a case.
>  rtc-cmos should be able to handle the vast majority of x86
>  rtcs out there. 

gen_rtc was hooked up to the powerpc platform
ppc_md.set_rtc_time and ppc_md.get_rtc_time via the arch
specific get_rtc_time() and  set_rtc_time() routines.

>From what I can tell, those generic rtc routines the powerpc
arch provides are not properly hooked into the new rtc subsystem.
This causes problems for multi-platform builds where some platforms
must use gen_rtc, and some must the new rtc subsytem.


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