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

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Message-ID: <20080411084903.GK26777@enneenne.com>
Date:	Fri, 11 Apr 2008 10:49:03 +0200
From:	Rodolfo Giometti <giometti@...eenne.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	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 09:28:40AM +0100, Alan Cox wrote:
> > How can I do that? From a serial device I just need the IRQ time
> > arrival, no other data at all. How a ldisc can help me in this task?
> 
> At the moment you can't. That needs fixing. Most of the infrastructure is
> there but not all of it.
> 
> > This patch adds PPS support just for UARTs, other devices should
> > provide their own support by using the new provided API. :)
> 
> I do not want PPS code adding to every single serial driver. That way
> lies madness. We do it once, and in the right layer. I'll take a further

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

> look at it after the tty->ops patch is merged. At that point we'll be in
> a good position to add the needed ops/callbacks.

Can you please give me an URL where I can see that patch?

Thanks a lot for your help,

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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