netdev - Re: [PATCH V6 net-next 06/11] net: Introduce a new MII time stamping interface.

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Message-ID: <20191220153359.GA11117@lunn.ch>
Date:   Fri, 20 Dec 2019 16:33:59 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Richard Cochran <richardcochran@...il.com>
Cc:     netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
        devicetree@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        Miroslav Lichvar <mlichvar@...hat.com>,
        Murali Karicheri <m-karicheri2@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Willem de Bruijn <willemb@...gle.com>,
        Wingman Kwok <w-kwok2@...com>
Subject: Re: [PATCH V6 net-next 06/11] net: Introduce a new MII time stamping
 interface.

On Fri, Dec 20, 2019 at 06:57:12AM -0800, Richard Cochran wrote:
> On Tue, Dec 17, 2019 at 10:21:55AM +0100, Andrew Lunn wrote:
> > Forward declarations are considered bad.
> 
> Not by me!

Lets see what David says.

> > For the moment what you have is sufficient. I doubt anybody is using
> > the dp83640 with phylink, and the new hardware you are targeting seems
> > to be RGMII based, not SERDES, which is the main use case for PHYLINK.
> 
> Yeah, my impression is that the phyter will be the first and last phy
> time stamping device ever created.  Designers reject this part because
> it is 100 mbit only.  And there are no gigabit+ phys with time
> stamping at all.

The Marvell PHY datasheets indicate they support PTP. I've not looked
at how they implement it, and if the current model will work.

   Andrew