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From: Stathis Voukelatos <stathis.voukelatos-zgcZaY4qg+21Qrn1Bg8BZw@public.gmane.org>
To: Richard Cochran <richardcochran-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH net-next v4 0/3] Linn Ethernet Packet Sniffer driver
Date: Wed, 25 Feb 2015 17:12:08 +0000	[thread overview]
Message-ID: <54EE0268.2040201@linn.co.uk> (raw)
In-Reply-To: <20150225170127.GD7703-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>

Hi Richard,

On 25/02/15 17:01, Richard Cochran wrote:
> On Wed, Feb 25, 2015 at 04:19:45PM +0100, Richard Cochran wrote:
>> Let me suggest another approach that stays in line with the existing
>> frame work.  Based on the device's limitations and your own example,
>> it seems clear that the intended use case is synchronization for AVB
>> applications using gPTP.
>
> Also, forgot to say, expose your clock as a PTP Hardware Clock (PHC).
>

Regarding this last point, the actual counter that generates the 
timestamps is not part of the sniffer H/W module. Timestamps are 
provided to the sniffer externally in H/W by a different module.
Apart of that there is not eg. a sniffer register to read the current 
counter value. I wonder if it should be the driver for the module where 
the counter belongs (called Event Timer in the Pistachio Soc) that 
should register the PHC.

I need some more time to study your other suggestions regarding the PHY 
timestamping framework.

> Thanks,
> Richard
>

Regards,
Stathis
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  parent reply	other threads:[~2015-02-25 17:12 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-24 16:48 [PATCH net-next v4 0/3] Linn Ethernet Packet Sniffer driver Stathis Voukelatos
2015-02-24 16:48 ` [PATCH net-next v4 1/3] Linn Ethernet packet sniffer: device tree binding and vendor prefix Stathis Voukelatos
2015-02-24 16:48 ` [PATCH net-next v4 2/3] Linn packet sniffer core framework Stathis Voukelatos
2015-02-24 16:48 ` [PATCH net-next v4 3/3] Linn Ethernet packet sniffer driver Stathis Voukelatos
2015-02-25 15:19 ` [PATCH net-next v4 0/3] Linn Ethernet Packet Sniffer driver Richard Cochran
2015-02-25 17:01   ` Richard Cochran
     [not found]     ` <20150225170127.GD7703-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2015-02-25 17:12       ` Stathis Voukelatos [this message]
2015-02-25 17:30         ` Richard Cochran
2015-02-27 17:22           ` Stathis Voukelatos
     [not found]           ` <54F0A4C4.3020407@linn.co.uk>
     [not found]             ` <54F0A4C4.3020407-zgcZaY4qg+21Qrn1Bg8BZw@public.gmane.org>
2015-02-27 18:14               ` Richard Cochran
     [not found]                 ` <20150227181447.GA11594-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2015-03-06 13:45                   ` Stathis Voukelatos
2015-03-06 15:24                     ` Richard Cochran
     [not found]                 ` <54F98660.5070805@linn.co.uk>
2015-03-06 15:22                   ` Richard Cochran
2015-03-11 11:20                     ` Stathis Voukelatos
2015-03-11 15:03                       ` Richard Cochran

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