[KJ] how many real time clocks do we need?

[KJ] how many real time clocks do we need?

[Robert P. J. Day]

  just poking around the drivers/char directory, and noticed the
existence of both the RTC real-time clock, and the GEN_RTC real-time
clock in the Kconfig file.

  is there still a compelling need to be supporting *both* of those?
just curious.

rday

-- 
====================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

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Re: [KJ] how many real time clocks do we need?

[Matthew Wilcox]

On Thu, Feb 22, 2007 at 04:13:31PM -0500, Robert P. J. Day wrote:
>   just poking around the drivers/char directory, and noticed the
> existence of both the RTC real-time clock, and the GEN_RTC real-time
> clock in the Kconfig file.
> 
>   is there still a compelling need to be supporting *both* of those?
> just curious.

One works on some architectures, one works on other architectures.  Why
not take a hint from the Kconfig dependencies?

config RTC
        tristate "Enhanced Real Time Clock Support"
	depends on !PPC && !PARISC && !IA64 && !M68K && (!SPARC || PCI) && !FRV && !ARM && !SUPERH

config GEN_RTC
        tristate "Generic /dev/rtc emulation"
	depends on RTC!=y && !IA64 && !ARM && !M32R && !SPARC && !FRV

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Re: [KJ] how many real time clocks do we need?

[Richard Knutsson]

Matthew Wilcox wrote:
> On Thu, Feb 22, 2007 at 04:13:31PM -0500, Robert P. J. Day wrote:
>   
>>   just poking around the drivers/char directory, and noticed the
>> existence of both the RTC real-time clock, and the GEN_RTC real-time
>> clock in the Kconfig file.
>>
>>   is there still a compelling need to be supporting *both* of those?
>> just curious.
>>     
>
> One works on some architectures, one works on other architectures.  Why
> not take a hint from the Kconfig dependencies?
>
> config RTC
>         tristate "Enhanced Real Time Clock Support"
> 	depends on !PPC && !PARISC && !IA64 && !M68K && (!SPARC || PCI) && !FRV && !ARM && !SUPERH
>
> config GEN_RTC
>         tristate "Generic /dev/rtc emulation"
> 	depends on RTC!=y && !IA64 && !ARM && !M32R && !SPARC && !FRV
>
>   
Just curious, does IA64, ARM, SPARC and FRV (is that an arch?) have any 
real-time clock?

Richard Knutsson

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Re: [KJ] how many real time clocks do we need?

[Matthew Wilcox]

On Fri, Feb 23, 2007 at 08:05:37AM +0100, Richard Knutsson wrote:
> >config RTC
> >        tristate "Enhanced Real Time Clock Support"
> >	depends on !PPC && !PARISC && !IA64 && !M68K && (!SPARC || PCI) && 
> >	!FRV && !ARM && !SUPERH
> >
> >config GEN_RTC
> >        tristate "Generic /dev/rtc emulation"
> >	depends on RTC!=y && !IA64 && !ARM && !M32R && !SPARC && !FRV
>
> Just curious, does IA64, ARM, SPARC and FRV (is that an arch?) have any 
> real-time clock?

I think you could research this yourself, but :

config EFI_RTC
        bool "EFI Real Time Clock Services"
	depends on IA64

...

config ARM
        bool
	default y
	select RTC_LIB

(see also drivers/rtc/Kconfig)

./drivers/sbus/char/Kconfig:config SUN_MOSTEK_RTC

I dunno what arch/frv does for an RTC.
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