quoted

No.  The #address-cells is determined by the bus binding,
so that all RapidIO busses on the planet can be represented
in a similar way in the OF device tree.  Take for example
the PCI binding, which gives you three address cells -- one
to distinguish between different address spaces (configuration
space, legacy I/O space, memory mapped space) and to contain
some flags (prefetchable vs. non-prefetchable, etc.); the
other two 32-bit cells contain a 64-bit address, although
config and legacy I/O never are more than 32 bit, and many
PCI devices can't do 64-bit addressing at all.

Now, there is no OF binding for RapidIO yet of course, but
it would be good to start thinking about one while doing
the binding for your specific controller -- it will make
life easier down the line for everyone, including yourself.

How about I add more words here for more clear expression?
Such as "<2> for 34 and 50 bit address, <3> for 66 bit address".

You should more explicitly define the address format, i.e.
what every bit means -- just saying it is 64 or 96 bits isn't
enough.  While you're doing that, think of a way that can
represent _every possible_ RapidIO address, not just the ones
supported by this particular controller.


Segher