Re: [PATCH net-next v5 09/13] net: phylink: Use phy_caps_lookup for fixed-link configuration

[Andrew Lunn]

> Also I am not sure it makes sense to say we can't support multiple
> modes on a fixed connection. For example in the case of SerDes links
> and the like it isn't unusual to see support for CR/KR advertised at
> the same speed on the same link and use the exact same configuration
> so a fixed config could support both and advertise both at the same
> time if I am not mistaken.

Traditionally, fixed link has only supported one mode. The combination
of speed and duplex fully describes a base-T link. Even more
traditionally, it was implemented as an emulated C22 PHY, using the
genphy driver, so limited to just 1G. With multigige PHY we needed to
be a bit more flexible, so phylink gained its own fixed link
implementation which did not emulate a PHY, just the results of
talking to a multigige PHY.

But i don't think you are actually talking about a PHY. I think you
mean the PCS advertises CR/KR, and you want to emulate a fixed-link
PCS? That is a different beast.

	Andrew