linux-kernel - Re: [PATCH] rtc-ds1302: handle write protection

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Message-ID: <1369908882.17429.13.camel@host5.omatika.ru>
Date:	Thu, 30 May 2013 14:14:42 +0400
From:	Sergey Yanovich <ynvich@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	Marc Zyngier <maz@...terjones.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Jingoo Han <jg1.han@...sung.com>
Subject: Re: [PATCH] rtc-ds1302: handle write protection

On Wed, 2013-05-29 at 15:53 -0700, Andrew Morton wrote:
> On Tue, 21 May 2013 03:21:30 +0400 Sergey Yanovich <ynvich@...il.com> wrote:
> @@ -321,6 +326,7 @@ static int ds1302_rtc_remove(struct platform_device *pdev)
> >  {
> >  	struct rtc_device *rtc = platform_get_drvdata(pdev);
> >  
> > +	ds1302_writebyte(RTC_ADDR_CTRL, RTC_CMD_WRITE_DISABLE);
> >  	rtc_device_unregister(rtc);
> >  	platform_set_drvdata(pdev, NULL);
> 
> ds1302_rtc_remove() no longer exists in my tree - it got whittled away
> to nothing by
> http://ozlabs.org/~akpm/mmots/broken-out/rtc-rtc-ds1302-remove-unnecessary-platform_set_drvdata.patch
> and
> http://ozlabs.org/~akpm/mmots/broken-out/drivers-rtc-rtc-ds1302c-remove-empty-function.patch
> 
> Perhaps it should be re-added for this?

There are 2 options. I would be happy with either.

1. I've chosen 'probe/remove' to enable/disable write access.

2. Another option is to wrap enable/disable around
ds1302_rtc_set_time().

IIUC, the former saves a few bytes of memory. However, now, when
ds1302_rtc_remove() is gone, the latter looks better. So I could rewrite
the patch either way.

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