netdev - Re: [PATCH v2] net: macb: do not scan PHYs manually

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Message-ID: <20160428210357.GB30217@jcartwri.amer.corp.natinst.com>
Date:	Thu, 28 Apr 2016 16:03:57 -0500
From:	Josh Cartwright <joshc@...com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	Nathan Sullivan <nathan.sullivan@...com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Florian Fainelli <f.fainelli@...il.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: Re: [PATCH v2] net: macb: do not scan PHYs manually

On Thu, Apr 28, 2016 at 08:59:32PM +0200, Andrew Lunn wrote:
> On Thu, Apr 28, 2016 at 01:55:27PM -0500, Nathan Sullivan wrote:
> > On Thu, Apr 28, 2016 at 08:43:03PM +0200, Andrew Lunn wrote:
> > > > I agree that is a valid fix for AT91, however it won't solve our problem, since
> > > > we have no children on the second ethernet MAC in our devices' device trees. I'm
> > > > starting to feel like our second MAC shouldn't even really register the MDIO bus
> > > > since it isn't being used - maybe adding a DT property to not have a bus is a
> > > > better option?
> > > 
> > > status = "disabled"
> > > 
> > > would be the unusual way.
> > > 
> > >       Andrew
> > 
> > Oh, sorry, I meant we use both MACs on Zynq, however the PHYs are on the MDIO
> > bus of the first MAC.  So, the second MAC is used for ethernet but not for MDIO,
> > and so it does not have any PHYs under its DT node.  It would be nice if there
> > were a way to tell macb not to bother with MDIO for the second MAC, since that's
> > handled by the first MAC.
> 
> Yes, exactly, add support for status = "disabled" in the mdio node.

Unfortunately, the 'macb' doesn't have a "mdio node", or alternatively:
the node representing the mdio bus is the same node which represents the
macb instance itself.  Setting 'status = "disabled"' on this node will
just prevent the probing of the macb instance.

  Josh

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