linux-kernel - Re: [PATCH net-next 09/13] net: mvpp2: dynamic reconfiguration of the PHY mode

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Date:   Thu, 24 Aug 2017 19:13:01 +0200
From:   Antoine Tenart <antoine.tenart@...e-electrons.com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Antoine Tenart <antoine.tenart@...e-electrons.com>,
        davem@...emloft.net, kishon@...com, jason@...edaemon.net,
        sebastian.hesselbarth@...il.com,
        gregory.clement@...e-electrons.com,
        thomas.petazzoni@...e-electrons.com, nadavh@...vell.com,
        linux-kernel@...r.kernel.org, mw@...ihalf.com, stefanc@...vell.com,
        miquel.raynal@...e-electrons.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 09/13] net: mvpp2: dynamic reconfiguration of
 the PHY mode

On Thu, Aug 24, 2017 at 06:04:01PM +0100, Russell King - ARM Linux wrote:
> On Thu, Aug 24, 2017 at 06:57:43PM +0200, Andrew Lunn wrote:
> > > I see what could be the issue but I do not understand one aspect though:
> > > how could we switch from one PHY to another, as there's only one output
> > > between the SoC (and so a given GoP#) and the board. So if a given PHY
> > > can handle multiple modes I see, but in the other case a muxing
> > > somewhere would be needed? Or did I miss something?
> > 
> > I think we need a hardware diagram...
> > 
> > How are the RJ45, copper PHY, SFP module connected to the SoC?
> > 
> > Somewhere there must be a mux, to select between copper and
> > fibre. Where is that mux?
> 
> In the 88x3310 PHY:
> 
>                      .------- RJ45
> MVPP2 ----- 88x3310 PHY
>                      `------- SFP+

And the "MVPP2" part can be expended to:

        .-- GoP #0 --.
MVPP2 ----- GoP #1 ---- Comphy lane #X -- 88x3310
        `-- GoP #2 --'

Thanks!
Antoine

-- 
Antoine Ténart, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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