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    SubjectRe: [EXT] Re: [PATCH net-next 02/10] net: phy: phylink: allow 10GKR interface to use in-band negotiation
    On Mon, Mar 19, 2018 at 02:08:23PM +0100, Andrew Lunn wrote:
    > > > If they don't have PHYs, how are the connected to the outside world?
    > >
    > > By external SFP or direct attached cable.
    >
    > Maybe i'm missing something, but don't you just need to add an SFP
    > device in the device tree. The SFP code and PHYLINK will work
    > together, query what the SFP module is, use the GPIOs to determine
    > link up/down and module present, and tell the MAC how to configure the
    > MAC-SFP link?

    This would definitively work for SFP connectors with a PHY, but would
    that work when using direct attached cable? As in the second case
    phylink wouldn't be able to ask the SFP PHY for the link state.

    Antoine

    --
    Antoine Ténart, Bootlin (formerly Free Electrons)
    Embedded Linux and Kernel engineering
    https://bootlin.com

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