netdev - Re: [PATCH net-next] net: mvpp2: phylink support

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Message-ID: <20170925104532.GN20805@n2100.armlinux.org.uk>
Date:   Mon, 25 Sep 2017 11:45:32 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Antoine Tenart <antoine.tenart@...e-electrons.com>
Cc:     davem@...emloft.net, andrew@...n.ch,
        gregory.clement@...e-electrons.com,
        thomas.petazzoni@...e-electrons.com,
        miquel.raynal@...e-electrons.com, nadavh@...vell.com,
        linux-kernel@...r.kernel.org, mw@...ihalf.com, stefanc@...vell.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: mvpp2: phylink support

On Mon, Sep 25, 2017 at 11:55:14AM +0200, Antoine Tenart wrote:
> Hi Russell,
> 
> On Fri, Sep 22, 2017 at 12:07:31PM +0100, Russell King - ARM Linux wrote:
> > On Thu, Sep 21, 2017 at 03:45:22PM +0200, Antoine Tenart wrote:
> > > Convert the PPv2 driver to use phylink, which models the MAC to PHY
> > > link. The phylink support is made such a way the GoP link IRQ can still
> > > be used: the two modes are incompatible and the GoP link IRQ will be
> > > used if no PHY is described in the device tree. This is the same
> > > behaviour as before.
> > 
> > This makes no sense.  The point of phylink is to be able to support SFP
> > cages, and SFP cages do not have a PHY described in DT.  So, when you
> > want to use phylink because of SFP, you can't, because if you omit
> > the PHY the driver avoids using phylink.
> 
> Yes that's an issue. However we do need to support the GoP link IRQ
> which is also needed in some cases where there is no PHY (and when
> phylink cannot be used). What would you propose to differentiate those
> two cases: no PHY using phylink, and no PHY using the GoP link IRQ?

Can you describe what the GoP link IRQ is doing please?

-- 
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