linux-kernel - Re: [PATCH 0/5] Enable PPS reporting for USB serial devices

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Message-ID: <20130910073105.GB5030@enneenne.com>
Date:	Tue, 10 Sep 2013 09:31:05 +0200
From:	Rodolfo Giometti <giometti@...eenne.com>
To:	Paul Chavent <Paul.Chavent@...ra.fr>
Cc:	linux-usb@...r.kernel.org, gregkh@...uxfoundation.org,
	jhovold@...il.com, fschaefer.oss@...glemail.com, jslaby@...e.cz,
	max@...e.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] Enable PPS reporting for USB serial devices

On Mon, Sep 09, 2013 at 06:01:15PM +0200, Paul Chavent wrote:
> Hi.
> 
> This series enable the PPS reporting for USB serial devices.

I have nothing against with this solution but consider that reporting
a PPS signal through USB bus may add unknown delays that may vanish
clock stability... as far as I know you should not use USB serial port
with PPS. Have you some statistics about clock stability in a real
implementation?

Ciao,

Rodolfo

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