Re: [RFC PATCH v3 2/2] drivers: mfd: vexpress: add Serial PowerController (SPC) support

[Olof Johansson]

On Fri, Jun 14, 2013 at 02:04:00PM +0100, Pawel Moll wrote:
> On Thu, 2013-06-13 at 23:52 +0100, Olof Johansson wrote:
> > > +     reg = <0 0x7FFF0000 0 0x1000>;
> > 
> > #size-cells 2 on the parent bus? That's somewhat unusual. 
> 
> LPAE == 40 bit physical addresses == potential > 32 bit sizes (memory
> blocks > 4GB)

Yeah, I guess that's most commonly needed for the /memory nodes -- having
devices with more than 4GB of register space is quite unusual.

It doesn't really matter much, but it saves some padding of 0s if you
pick a smaller value.

I thought we used 2/1 for address/size-cells on PA Semi hardware, but I just
checked and we had 2/2. Maybe it was Apple that used 2/1.

Anyway, no big deal.


-Olof
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