netdev - Re: [PATCH RFC net-next 0/4] net: dsa: always use phylink

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Date:   Wed, 29 Jun 2022 09:18:10 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Claudiu Manoil <claudiu.manoil@....com>,
        "David S. Miller" <davem@...emloft.net>,
        DENG Qingfang <dqfext@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        George McCollister <george.mccollister@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Jakub Kicinski <kuba@...nel.org>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Marek Behún <kabel@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        Sean Wang <sean.wang@...iatek.com>,
        UNGLinuxDriver@...rochip.com,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>
Subject: Re: [PATCH RFC net-next 0/4] net: dsa: always use phylink

> I should point out that if a DSA port can be programmed in software to
> support both SGMII and 1000baseX, this will end up selecting SGMII
> irrespective of what the hardware was wire-strapped to and how it was
> initially configured. Do we believe that would be acceptable?

I'm pretty sure the devel b board has 1000BaseX DSA links between its
two switches. Since both should end up SGMII that should be O.K.

Where we potentially have issues is 1000BaseX to the CPU. This is not
an issue for the Vybrid based boards, since they are fast Ethernet
only, but there are some boards with an IMX6 with 1G ethernet. I guess
they currently use 1000BaseX, and the CPU side of the link probably
has a fixed-link with phy-mode = 1000BaseX. So we might have an issue
there.

	Andrew