linux-kernel - Re: [rtc-linux] [PATCH/RFC 0/5] Generic RTC class driver

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Date:	Wed, 25 Feb 2009 10:54:33 +0100 (CET)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	David Woodhouse <dwmw2@...radead.org>
cc:	Alessandro Zummo <alessandro.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, Richard Zidlicky <rz@...ux-m68k.org>,
	linux-parisc@...r.kernel.org,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	David@...abs.org, Kyle McMartin <kyle@...artin.ca>,
	Linux/PPC Development <linuxppc-dev@...abs.org>,
	Linux/m68k <linux-m68k@...ts.linux-m68k.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [rtc-linux] [PATCH/RFC 0/5] Generic RTC class driver

On Wed, 25 Feb 2009, David Woodhouse wrote:
> On Mon, 2009-02-23 at 13:34 +0100, Geert Uytterhoeven wrote:
> > >    my opinion on this kind of stuff is that I want to avoid the layering
> > >  of implementations under the rtc subsystem. I'd rather prefer that each
> > >  rtc device had its own driver. 
> > >  
> > >   I've made error in the past, by accepting such kind of drivers, and
> > >  would like to avoid that it happens again.
> > 
> > So you want us to kill the ppc_md.[gs]et_rtc_time() [ppc], mach_hwclk() [m68k],
> > mach_gettod() [m68knommu] (and probably a few other) abstractions, and move all
> > RTC code out of arch/ into seperate drivers under drivers/rtc/ instead?
> 
> That's the ideal... although did we get NTP sync working again yet?
> 
> The rtc-ppc driver was intended as a short-term workaround so that we
> can enable the generic RTC class (which was required for PA Semi
> Electra, iirc), and still have stuff work on other platforms.

Sure. The only differences between your rtc-ppc driver and rtc-parisc were:
  - rtc-ppc uses the PPC RTC abstraction (ppc_md.[gs]et_rtc_time()),
    while rtc-parisc uses the genrtc abstraction layer ([gs]et_rtc_time()),
    which is shared by several architectures,
  - rtc-ppc has the platform device built-in in the driver, while rtc-parisc
    relies on the creation of the platform device in platform code.

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

Phone:    +32 (0)2 700 8453
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E-mail:   Geert.Uytterhoeven@...ycom.com
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