linux-kernel - Re: [PATCH 1/4] rtc: sa1100: enable/disable rtc when probe/remove the device

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Date:	Fri, 30 Nov 2012 15:04:12 +0800
From:	Haojian Zhuang <haojian.zhuang@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Chao Xie <chao.xie@...vell.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	xie chao <xiechao.mail@...il.com>
Subject: Re: [PATCH 1/4] rtc: sa1100: enable/disable rtc when probe/remove the device

On Thu, Nov 29, 2012 at 6:25 PM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Wed, Nov 28, 2012 at 09:21:07PM -0500, Chao Xie wrote:
>> The original sa1100_rtc_open/sa1100_rtc_release will be called
>> when the /dev/rtc0 is opened or closed.
>> In fact, these two functions will enable/disable the clock, and
>> register/unregister the irqs.
>> User application will use /dev/rtc0 to read the rtc time or set
>> the alarm. The rtc should still run indepent of open/close the
>> rtc device.
>> So only enable clock and register the irqs when probe the device,
>> and disable clock and unregister the irqs when remove the device.
>
> NAK.  I don't think you properly understand what's going on here if you
> think moving the entire open and release functions into the probe and
> remove functions is the right thing to do.

Since PXA27x & PXA3xx supports dual rtc device at the same time,
user could choose use either of rtc at run time. Then clk & irq are setup
in open().

Chao,
So you shouldn't remove them into probe().
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