On that we agree. Maybe I was just misunderstanding the earlier
conversation where I thought you would not allow specific drivers to
access MMS other than 0,1,4 and the ones that map to MMDs.

I would be disappointed to see a driver access registers which is not
in its address space. The LED driver can be in the MAC driver, or the
PHY driver, depending on where its registers are. The PTP driver can
be in the MAC driver, or the PHY driver, depending on where its
registers are. Hopefully you don't have anything which is split over
both addresses spaces.

     Andrew