linux-kernel - Re: [PATCH 2/4] rtc: pxa: fix rtc caculation issue

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Message-ID: <CADApbehR9TcrGU-t2ZqT58O0OswVmJPQ1paceO6k1+ADvU026A@mail.gmail.com>
Date:	Mon, 3 Dec 2012 10:40:53 +0800
From:	Chao Xie <xiechao.mail@...il.com>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	Chao Xie <chao.xie@...vell.com>, a.zummo@...ertech.it,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	haojian.zhuang@...il.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/4] rtc: pxa: fix rtc caculation issue

On Fri, Nov 30, 2012 at 4:04 AM, Robert Jarzmik <robert.jarzmik@...e.fr> wrote:
> Chao Xie <chao.xie@...vell.com> writes:
>
> Hi Chao Xie,
>
> First of all, could you please send patches from rtc-pxa to me also, as I'm
> maintaining that driver ?
>
> Second point, the original design of the driver relies on the special case of
> writing zeroes to WOM and DOM, as mentionned in PXA27x Developers Guide, chapter
> 21.4.2.3.5 "Writing Alarm Registers with Invalid (Zero) Data", which states :
>> Day-Of-Week (DOW), or Week-Of-Month (WOM), Day of Month (DOM), Month or Year
>> fields—Zero is not valid for these fields. If zero is written into any of
>> these fields, it is ignored while generating the alarm.
>
> I'd like to know if your patch fixes something, or is an enhancement ?
>
> Cheers.
>
> --
> Robert
>
> PS: I've not checked the patch yet, that's just a prelimary comment on the patch
> message.

hi
I am sorry, i just use get_maintainer.pl to get the "to" list.
I have go through the spec. The spec has the desctiption about the
invalid data writing.
I am a little confused about the "wrting 0 to DOW". The descrption is
confused. first it said that "If zero is written into any of these
fields, it is ignored
while generating the alarm", then it gives a example, that if writing
0 to DOW, "For example, if a zero is written into a DOW field, the
alarm is set
every day at the time written in the Hours, Minutes, and Seconds
field”. It seems that the Year/Month/Week will not take effect.
I will do the test on the board again, and send out the update.
--
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