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Date: Thu, 1 Oct 2020 03:24:10 +0200 From: Andrew Lunn <andrew@...n.ch> To: Chris Packham <Chris.Packham@...iedtelesis.co.nz> Cc: "vivien.didelot@...il.com" <vivien.didelot@...il.com>, Florian Fainelli <f.fainelli@...il.com>, netdev <netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: dsa: mv88e6xxx: serdes link without phy > port@8 { > reg = <8>; > label = "internal8"; > phy-mode = "rgmii-id"; > fixed-link { > speed = <1000>; > full-duplex; > }; > }; > port@9 { > reg = <9>; > label = "internal9"; > phy-mode = "rgmii-id"; > fixed-link { > speed = <1000>; > full-duplex; > }; > }; > > The problem is that by declaring ports 8 & 9 as fixed link the driver > sets the ForcedLink in the PCS control register. Which mostly works. > Except if I add a chassis controller while the system is running (or one > is rebooted) then the newly added controller doesn't see a link on the > serdes. Hi Chris You say SERDES here, but in DT you have rgmii-id? Can you run 1000Base-X over these links? If you can, it is probably worth chatting to Russell King about using inband-signalling, and what is needed to make it work without having back to back SFPs. If i remember correctly, Russell has said not much is actually needed. Andrew
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