[PATCH net-next RFC 0/5] net: phy: Introduce a port representation
Andrew Lunn
andrew at lunn.ch
Tue Jan 7 08:22:51 PST 2025
> I have however seen devices that have a 1G PHY connected to a RJ45
> port with 2 lanes only, thus limiting the max achievable speed to 100M.
> Here, we would explicietly describe the port has having 2 lanes.
Some PHYs would handle this via downshift, detecting that some pairs
are broken, and then dropping down to 100M on their own. So it is not
always necessary to have a board property, at least not for data.
I've no idea how this affects power transfer. Can the link partners
detect which pairs are actually wired?
Andrew
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