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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v5 2/3] netdev/of/phy: Add MDIO bus multiplexer support.
Date: Sat, 21 Apr 2012 15:32:01 -0400 (EDT)
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From: David Daney <ddaney.cavm@gmail.com>
Date: Wed, 18 Apr 2012 16:20:53 -0700

> +config MDIO_BUS_MUX
> +	tristate
> +	help
> +	  This module provides a driver framework for MDIO bus
> +	  multiplexers which connect one of several child MDIO busses
> +	  to a parent bus.  Switching between child busses is done by
> +	  device specific drivers.
> +

This driver uses OF and OF_MDIO, and therefore need dependencies upon
them.  Otherwise it can be enabled in configurations which will result
in build failures.