From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v4 3/3] netdev/of/phy: Add MDIO bus multiplexer driven
 by GPIO lines.
Date: Tue, 17 Apr 2012 22:53:08 -0400 (EDT)
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From: David Daney <ddaney.cavm@gmail.com>
Date: Tue, 17 Apr 2012 10:32:46 -0700

> From: David Daney <david.daney@cavium.com>
> 
> The GPIO pins select which sub bus is connected to the master.
> 
> Initially tested with an sn74cbtlv3253 switch device wired into the
> MDIO bus.
> 
> Signed-off-by: David Daney <david.daney@cavium.com>

Are you sure the Kconfig dependencies are sufficient?  This code seems
to depend upon OF, and in particular the OF_MDIO stuff.