Using mdio-gpio driver with smsc PHY driver (driver stacking?)

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I am interested in using mdio-gpio driver to emulate the MDIO bus over
GPIO. This is needed to control the SMSC LAN 8700 PHY. Now, there is a
driver that already exists to control the phy (smsc.c).

How do I 'connect' the two drivers? Do I write a new driver? Or do I use
the mdio-gpio to set up the necessary pins, and then the smsc.c phy
driver (which uses MDIO already) will automatically use the mdio over
gpio.

I hope I made some sense.

Thanks,
Amit

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