_sc92031_mii_cmd
_sc92031_mii_cmd(port_base, Mii_SCAN, 0x1 << 6);
return _sc92031_mii_cmd(port_base, Mii_READ, reg << 6) >> 13;
_sc92031_mii_cmd(port_base, Mii_WRITE, (reg << 6) | ((u32)val << 11));