Re: [PATCH 1/5 v2] Add the explanation and a sample of RapidIO DTS sector to the document of booting-without-of.txt file.

[Segher Boessenkool <segher@kernel.crashing.org>]

> > 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

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