I think we cannot use mdio-mux-mmioreg since the register for doing
the switch is in middle of the "System Control" and shared with
other functions.  This is why we use a sycon/regmap for selecting
the MDIO.

You could add a mdio-mux-regmap.c.

However, it probably need restructuring of the stmmac mdio code, to
make the mdio bus usable as a separate driver. You need stmmac mdio
to probe first, then mdio-mux-remap should probe, and then lastly
stmmmac mac driver.

With stmmac mdio and stmmac mac being in one driver, there is no time
in the middle to allow the mux driver to probe.

It is some effort, but a nice cleanup and generalization.

   Andrew
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