netdev - RE: [EXT] Re: [PATCH net-next 02/10] net: phy: phylink: allow 10GKR interface to use in-band negotiation

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Date:   Mon, 19 Mar 2018 13:19:24 +0000
From:   Stefan Chulski <stefanc@...vell.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     Antoine Tenart <antoine.tenart@...tlin.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kishon@...com" <kishon@...com>,
        "gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
        "jason@...edaemon.net" <jason@...edaemon.net>,
        "sebastian.hesselbarth@...il.com" <sebastian.hesselbarth@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        "maxime.chevallier@...tlin.com" <maxime.chevallier@...tlin.com>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Yan Markman <ymarkman@...vell.com>,
        "mw@...ihalf.com" <mw@...ihalf.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [EXT] Re: [PATCH net-next 02/10] net: phy: phylink: allow 10GKR
 interface to use in-band negotiation



> -----Original Message-----
> From: Andrew Lunn [mailto:andrew@...n.ch]
> Sent: Monday, March 19, 2018 3:08 PM
> To: Stefan Chulski <stefanc@...vell.com>
> Cc: Antoine Tenart <antoine.tenart@...tlin.com>; Russell King - ARM Linux
> <linux@...linux.org.uk>; davem@...emloft.net; kishon@...com;
> gregory.clement@...tlin.com; jason@...edaemon.net;
> sebastian.hesselbarth@...il.com; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; thomas.petazzoni@...tlin.com;
> maxime.chevallier@...tlin.com; miquel.raynal@...tlin.com; Nadav Haklai
> <nadavh@...vell.com>; Yan Markman <ymarkman@...vell.com>;
> mw@...ihalf.com; linux-arm-kernel@...ts.infradead.org
> Subject: Re: [EXT] Re: [PATCH net-next 02/10] net: phy: phylink: allow 10GKR
> interface to use in-band negotiation
> 
> > > If they don't have PHYs, how are the connected to the outside world?
> > >
> > >    Andrew
> >
> > 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?
> 
>      Andrew

phylink pool SFP loss signal to determine link up/down?

Stefan,
Best Regards.