linux-kernel - Re: [PATCH 5/7] PPS: serial clients support.

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Date:	Fri, 11 Apr 2008 18:58:36 +0200
From:	Rodolfo Giometti <giometti@...eenne.com>
To:	Serge Belyshev <belyshev@...ni.sinp.msu.ru>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Dave Jones <davej@...hat.com>, Sam Ravnborg <sam@...nborg.org>,
	Greg KH <greg@...ah.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Kay Sievers <kay.sievers@...y.org>
Subject: Re: [PATCH 5/7] PPS: serial clients support.

On Fri, Apr 11, 2008 at 06:43:07PM +0400, Serge Belyshev wrote:
> Rodolfo Giometti <giometti@...eenne.com> writes:
> 
> > The problem is that deferencing the pps_event() call will cause severe
> > problems to PPS accuracy... here you can find some considerations on
> > this topic:
> >
> >    http://ml.enneenne.com/pipermail/linuxpps/2008-April/001738.html
> >
> 
> What about adding precise timestamping to the lowest possible irq
> handling level ( arch/*/entry*.S ) and then export that information
> in a general way so it is useful for other applications?

The problem is that at such level you cannot easily retrieve info
about where your serial port is connected to and which PPS source you
should manage...

Ciao,

Rodolfo

-- 

GNU/Linux Solutions                  e-mail:    giometti@...eenne.com
Linux Device Driver                             giometti@...ux.it
Embedded Systems                     phone:	+39 349 2432127
UNIX programming                     skype:     rodolfo.giometti
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