netdev - Re: net: phy: Dealing with 88e1543 dual-port mode

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Date:   Fri, 20 Nov 2020 01:00:50 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Tobias Waldekranz <tobias@...dekranz.com>
Cc:     Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Antoine Tenart <atenart@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: net: phy: Dealing with 88e1543 dual-port mode

> E.g. at Westermo we make switches with M12/M12X connectors [1] that
> sometimes have a 1G PHY behind a 2-pair M12 connector (for complicated
> legacy reasons). In such cases we have to remove 1000-HD/FD from the
> advertised link modes. Being able to describe that in the DT with
> something like:
> 
> ethernet-phy@0 {
>     mdi = "2-pair";
> };

We already have a max-speed property which could be used to do this.
It will remove the 1000-HD/FD from the link mode if you set it to 100.

   Andrew