Hi Anson, On Wed, Apr 25, 2018 at 2:36 AM, Anson Huang <anson.huang at nxp.com> wrote: > Sorry, I made a mistake here, the MAX7320 IO0 is for adjusting FEC1's voltage, In this case you need to pass the 'phy-supply' property inside the fec node and add a regulator that is controlled via MAX7320 IO0 pin.