linux-kernel - Re: commit e38c0a1f breaks powerpc boards with uli1575 chip

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Date:	Thu, 2 Jan 2014 18:04:17 -0600
From:	Scott Wood <scottwood@...escale.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Nikita Yushchenko <nyushchenko@....rtsoft.ru>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Dmitry Krivoschekov <dkrivoschokov@....rtsoft.ru>,
	"Alexey Lugovskoy" <lugovskoy@....rtsoft.ru>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	<linux-kernel@...r.kernel.org>,
	"Rob Herring" <robherring2@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	<linuxppc-dev@...ts.ozlabs.org>
Subject: Re: commit e38c0a1f breaks powerpc boards with uli1575 chip

On Mon, 2013-12-30 at 14:13 +1100, Benjamin Herrenschmidt wrote:
> On Thu, 2013-12-19 at 08:42 +0400, Nikita Yushchenko wrote:
> > No, this does not help.
> > 
> > I've dumped the actual content of 'range' and 'addr' at the failure
> > point 
> > (i.e. ar point that returns error with e38c0a1f but passes without 
> > e38c0a1f ):
> > 
> > OF: default map, cp=0, s=10000, da=70
> > range:  01 00 00 00 00 00 00 00 00 00 00 00
> >  addr:  00 00 00 00 00 00 00 00 00 00 00 70
> 
> Something that has a #address-cells larger than 2, or more generally,
> an address field that contains more than a single number, must have
> a specific translation backend, like we have for PCI.
> 
> This is a bit annoying but originates from the original OFW stuff on
> which this stuff is based where the bus node would provide the methods
> for translation.

I can maybe see that for PCI which has a special encoding, but why is it
always needed?  E.g. if Freescale localbus had a 64-bit offset instead
of 32-bit, the child nodes would have 3 address cells, but
straightforward use of ranges would bring it down to 2 for the final
physical address.  Existing localbus nodes already have "an address
field that contains more than a single number"; it's just a simple
enough encoding that it works to treat it as if it were a single large
number.

-Scott


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