linux-kernel - Re: Document sysfs interface to RTC system wakeup

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Message-ID: <cfd18e0f0811281340r2317a1e4y938e11da27a35558@mail.gmail.com>
Date:	Fri, 28 Nov 2008 16:40:35 -0500
From:	"Michael Kerrisk" <mtk.manpages@...glemail.com>
To:	"Pavel Machek" <pavel@...e.cz>
Cc:	"Jonathan Corbet" <corbet@....net>,
	"kernel list" <linux-kernel@...r.kernel.org>, dl9pf@....de,
	rdunlap@...otime.net, linux-doc@...r.kernel.org,
	"Andrew Morton" <akpm@...l.org>, "Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: Document sysfs interface to RTC system wakeup

On Wed, Nov 26, 2008 at 12:00 PM, Pavel Machek <pavel@...e.cz> wrote:
>> On Wed, 26 Nov 2008 17:15:24 +0100
>> Pavel Machek <pavel@...e.cz> wrote:
>>
>> > +How to use /sys/class/rtc/rtcX/wakealarm
>> > +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> > +This file takes the seconds since epoch to enable a wake event at the
>> > +specified time.
>>
>> More documentation is cool.  In this case, though, I'm left with an
>> immediate question: *why* am I interested in wakealarm?  Reading
>> through, I eventually figure out that it can maybe be used to get a
>> system to start up at some point in the future, maybe.  It seems like
>> that should be said at the outset.
>
> You can suspend/power down your machine, and it will power itself up
> at appropriate time.
>
>> Also; why do I want to migrate from /proc/acpi/alarm?
>
> Because /proc/acpi/alarm is ugly hack that is going to go away :-).

And these are the statements that (in slightly more polished terms)
should be in your doc ;-), in order to address Jonathan's quite
reasonable questions.
-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
git://git.kernel.org/pub/scm/docs/man-pages/man-pages.git
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