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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next 4/4] igb: enable auxiliary PHC functions for
 the i210.
Date: Wed, 29 May 2013 00:34:30 -0700 (PDT)
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From: Richard Cochran <richardcochran@gmail.com>
Date: Wed, 29 May 2013 09:24:45 +0200

> Also, using ethtool or sysfs is not really attractive for embedded
> designs (let's not forget the poor embedded guys). I think we need to
> have a way to specify the pin functions at (or before) kernel boot
> time.  Barring DT and kconfig, using a module parameter is the only
> way to accomplish this.

No module parameters.

The embedded guys can run an ethtool command early in boot
right after the driver loads.