mscc_miim_setup
rc = mscc_miim_setup(dev, &bus, "VSC9953 internal MDIO bus",
EXPORT_SYMBOL(mscc_miim_setup);
ret = mscc_miim_setup(dev, &bus, "mscc_miim", mii_regmap, 0, false);
int mscc_miim_setup(struct device *device, struct mii_bus **bus,