From: Andrew Lunn <andrew@lunn.ch>
Date: Wed,  1 May 2019 00:08:29 +0200

Save some power by disabling ports. The first patch fully disables a
port when it is runtime disabled. The second disables any ports which
are not used at all.

Depending on configuration strapping, this can lower the temperature
of an idle switch a few degrees.

Series applied, thanks Andrew.