linux-kernel - Re: [PATCHv5 16/17] pps: add parallel port PPS client

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Message-ID: <20101216155810.GG10333@enneenne.com>
Date:	Thu, 16 Dec 2010 16:58:10 +0100
From:	Rodolfo Giometti <giometti@...eenne.com>
To:	Alexander Gordeev <lasaine@....cs.msu.su>
Cc:	linux-kernel@...r.kernel.org,
	"Nikita V. Youshchenko" <yoush@...msu.su>,
	linuxpps@...enneenne.com, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCHv5 16/17] pps: add parallel port PPS client

On Wed, Nov 24, 2010 at 07:15:54PM +0300, Alexander Gordeev wrote:
> Add parallel port PPS client. It uses a standard method for capturing
> timestamps for assert edge transitions: getting a timestamp soon after
> an interrupt has happened. This is not a very precise source of time
> information due to interrupt handling delays. However, timestamps for
> clear edge transitions are much more precise because the interrupt
> handler continuously polls hardware port until the transition is done.
> Hardware port operations require only about 1us so the maximum error
> should not exceed this value. This was my primary goal when developing
> this client.
> Clear edge capture could be disabled using clear_wait parameter.
> 
> Signed-off-by: Alexander Gordeev <lasaine@....cs.msu.su>

Acked-by: Rodolfo Giometti <giometti@...ux.it>

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