netdev - Re: dsa: mv88e6xxx: serdes link without phy

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Message-ID: <20201001123649.GC4050473@lunn.ch>
Date:   Thu, 1 Oct 2020 14:36:49 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>
Cc:     Russell King <linux@...linux.org.uk>,
        "vivien.didelot@...il.com" <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: dsa: mv88e6xxx: serdes link without phy

> > Can you run 1000Base-X over these links?
> With some reading "1000base-x" does seem the right thing to say here. 
> It's even what is reflected in the CMODE field for those ports.

One more thing you might need is

managed = "in-band-status";

> > If you can, it is probably
> > worth chatting to Russell King about using inband-signalling, and what
> > is needed to make it work without having back to back SFPs. If i
> > remember correctly, Russell has said not much is actually needed.
> 
> That'd be ideal. The sticking point seems to be allowing it to have no PHY.

I think there is more to it than that. This is new ground to some
extent.

	Andrew