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Date:   Wed, 29 Jun 2022 09:18:10 +0200
From:   Andrew Lunn <andrew@lunn.ch>
To:     "Russell King (Oracle)" <linux@armlinux.org.uk>
Cc:     Heiner Kallweit <hkallweit1@gmail.com>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
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Subject: Re: [PATCH RFC net-next 0/4] net: dsa: always use phylink
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> 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