Hi Stuart

Is the intent to eventually purge the device trees of enable-method/cpu-release-addr
and have that set by the boot firmware?  Or, keep the spin-table method 
around as a least common denominator mechanism and override it when
necessary?   Wondering what the longer term thinking is...

Personally I'd like to see anything that's not a fixed HW property be
omitted in the DTS and injected by the boot firmware. Certainly anything
which is a property of the FW should be injected by that FW.

That would cover:

- Any enable-method property and related properties and/or nodes. This
  is heavily dependent on the boot firmware configuration, and can
  differ substantially between instances of a given board.

- Most /memreserve/ uses (as these typically protect firmware or
  trampoline code).

- Any memory nodes where memory can be dynamically populated on the
  board.

- CPU nodes if the presence of said CPUs is dynamically determined. 
  
In the long term I'd like to see DTS get fully decoupled from the
kernel.

Cheers,
Mark.