[PATCH 2/3] Derive ebc ranges property from EBC registers

[Josh Boyer]

On Wed, May 16, 2007 at 09:09:30AM +1000, David Gibson wrote:
> > Do we want a "ranges;" here as a placeholder?  I don't see where it's
> > absolutely required, but it makes me feel better for some reason...
> 
> Absolutely not.  An empty ranges property indicates that the child bus
> address space is the same as the parent bus address space.  If we're
> using the chip-select/offset addressing form for the EBC peripherals,
> that's manifestly not the case.

Ah ok.  My lack of device tree experience showing through again.

> > So this sets the ranges for the EBC bus, but not the "regs" properties
> > of the child nodes.  Without that, the child nodes will not be mapped to
> > the correct addresses...
> 
> Well, no, the child reg properties can't be deduced from the EBC
> registers.

Right, I didn't mean to imply the could be.

> > Did you have a plan on how to fixup the child "regs" properties so that
> > when the DIP switches are flipped around, the children show up
> > correctly?
> 
> Well, on Ebony (AFAICT), the only child reg property that might need
> adjustment is the small flash.  My MTD enabling patch includes some
> code in the boot wrapper to toggle the appropriate bit in it's reg
> property.

Hm, ok.  On Bamboo, it's more complicated.  I'll have to think of something
there I suppose.

josh