linux-kernel - Re: [PATCH] fix RTC_CLASS regression with PARISC

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Date:	Mon, 08 Sep 2008 18:00:47 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	David Miller <davem@...emloft.net>
Cc:	david-b@...bell.net, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-parisc@...r.kernel.org
Subject: Re: [PATCH] fix RTC_CLASS regression with PARISC

On Mon, 2008-09-08 at 14:35 -0700, David Miller wrote:
> From: David Brownell <david-b@...bell.net>
> Date: Mon, 8 Sep 2008 14:29:57 -0700
> 
> > On Monday 08 September 2008, James Bottomley wrote:
> > > All the PDC real time clock calls can do are read and set, nothing else,
> > > so it's idealy suited to the GEN_RTC infrastructure ... what's the
> > > benefit in moving it to RTC_CLASS?
> > 
> > The same benefit always found in sharing infrastructure.  Lots
> > of little differences/bugs go away.  Infrastructure improvements
> > and bugfixes get leveraged.  Dead and crufticious code can vanish.
> > And so forth.
> 
> I absolutely and positively agree with David here.
> 
> I just last week converted all of both sparc ports to the generic
> RTC layer and what a huge burdon has been moved off of my shoulders.
> 
> The RTC layer is very nice and it even allows writing drivers for
> very simplistic RTC devices (even ones that cannot be written)
> with ease.  I had two such cases to handle on sparc64.

I'm guessing they're not upstream yet (since I can't find them)?

However, if you based them on rtc-ppc.c then yes, I agree, it looks
reasonably easy:  it's just a matter of converting over the GEN_RTC
PDT_TOD helpers.

On a related note ... I could do this specifically for parisc, but I
could also do a GEN_RTC conversion to PDC_CLASS ... would that be more
helpful?

James


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