netdev - Re: dsa: using multi-gbps speeds on CPU port

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Message-ID: <20190516125800.GC14298@lunn.ch>
Date:   Thu, 16 May 2019 14:58:00 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        netdev <netdev@...r.kernel.org>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: dsa: using multi-gbps speeds on CPU port

> My basic idea is to interface a Raspberry Pi-like board to a dumb
> "switch evaluation board" which has only the Ethernet ports and the
> SPI/whatever control interface exposed. The DSA CPU/master port combo
> in this case would go through a Cat5 cable, which is not going to pan
> out very well currently because both the RPi-side PHY and the switch
> board-side PHY need some massaging from their respective drivers. Both
> PHYs are C22.

Hi Vladimir

There are a number of boards like this, back to back PHYs. But they
all have the switch PHY strapped so they start on power on and
auto-negotiate. DSA then just works.

    Andrew