linux-kernel - Re: [PATCH] rtc: ds1743 support

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Date:	Thu, 30 Nov 2006 10:23:55 +0100
From:	Torsten Ertbjerg Rasmussen <tr@...tec.dk>
To:	Alessandro Zummo <alessandro.zummo@...ertech.it>
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtc: ds1743 support

On Thursday 30 November 2006 09:47, you wrote:
> On Thu, 30 Nov 2006 08:12:02 +0100
>
> Torsten Ertbjerg Rasmussen <tr@...tec.dk> wrote:
> > The real time clocks ds1742 and ds1743 differs only in the size of the
> > nvram. This patch changes the existing ds1742 driver to support also
> > ds1743. The main change is that the nvram size is determined from the
> > resource attached to the device.
> >
> >
> > +	pdata->ioaddr_rtc = ioaddr + pdata->size_nvram;
> >
> >  	/* turn RTC on if it was not on */
> > +	ioaddr = pdata->ioaddr_rtc;
> >  	sec = readb(ioaddr + RTC_SECONDS);
>
>  why not
> 	sec = readb(pdata->ioaddr_rtc + RTC_SECONDS);
> ?

ioaddr is used several times below this point, so diff would be larger.

In the original code, ioaddr points to beginning of nvram and RTC_SECONDS 
implicitly adds the nvram size. Now the nvram size is removed from 
RTC_SECONDS (and other RTC_*) so ioaddr must point to start of rtc-data.

Regards,
Torsten Rasmussen

>
>
>  Acked-by: Alessandro Zummo <a.zummo@...ertech.it>


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