Re: [PATCH v1 3/3] ARM64 LPC: update binding doc

liviu.dudau
2016-01-13T10:09:18Z

On Tue, Jan 12, 2016 at 11:54:59PM +0100, Arnd Bergmann wrote:
> On Tuesday 12 January 2016 10:14:18 liviu.dudau@arm.com wrote:
> >
> > OK, looking at of_translate_one() comments it looks like a missing "ranges" property is
> > only accepted on PowerPC. I suggest you have an empty "ranges" property in your isa
> > parent node, that will signal to the OF parsing code that the mapping is 1:1. Then have
> > the IPMI node use the reg = <0x0 0xe4 4>; property values instead of reg = <0x1 0xe4 4>;
> >
> >
>
> A missing ranges property means that there is no translation, while an
> empty ranges means a 1:1 translation to the parent bus.
>
> We really want the former here, as I/O port addresses are not mapped into
> the MMIO space of the parent bus.

Agree. However of_translate_one()'s behaviour doesn't match our expectations and I have no
useful suggestions on what the right behaviour should be.

Best regards,
Liviu

>
> Arnd
>

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