unimac_mdio_readl
cmd = unimac_mdio_readl(priv, MDIO_CMD);
reg = unimac_mdio_readl(priv, MDIO_CFG);
reg = unimac_mdio_readl(priv, MDIO_CMD);
return read_poll_timeout(unimac_mdio_readl, val, !(val & MDIO_START_BUSY),