linux-kernel - RE: [PATCH v10 07/10] OF: Introduce helper function for getting PCI domain

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Date:	Thu, 11 Sep 2014 14:11:05 +0000
From:	Phil Edworthy <phil.edworthy@...esas.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Liviu Dudau <Liviu.Dudau@....com>
CC:	Yijing Wang <wangyijing@...wei.com>,
	Rob Herring <robherring2@...il.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Rob Herring <robh+dt@...nel.org>,
	"Jason Gunthorpe" <jgunthorpe@...idianresearch.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Will Deacon <Will.Deacon@....com>,
	Russell King <linux@....linux.org.uk>,
	linux-pci <linux-pci@...r.kernel.org>,
	"Linus Walleij" <linus.walleij@...aro.org>,
	Tanmay Inamdar <tinamdar@....com>,
	"Grant Likely" <grant.likely@...retlab.ca>,
	Sinan Kaya <okaya@...eaurora.org>,
	"Jingoo Han" <jg1.han@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	"Suravee Suthikulanit" <suravee.suthikulpanit@....com>,
	linux-arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Device Tree ML" <devicetree@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>
Subject: RE: [PATCH v10 07/10] OF: Introduce helper function for getting PCI
 domain_nr

Hi,

On 10 September 2014 19:20, Arnd wrote:
> On Tuesday 09 September 2014 12:20:54 Catalin Marinas wrote:
> >
> > We can assume that if a domain is not specified and there is a single
> > top level PCIe node, the domain defaults to 0. Are there any arm32
> > platforms that require multiple domains (and do not specify a number in
> > the DT)?
> 
> In theory, I think all of them could work with a single domain, but then
> you need to partition the bus number space between the host controllers,
> so you have the exact same situation that you either need to make up
> random bus numbers or put them in DT.
> 
> Using multiple domains is way cleaner for this, even if we have to
> make up the numbers.

Maybe this is a stupid question, but why would you want to specify the domain
in the DT at all? Doesn't every instance of a driver imply a separate domain?

Thanks
Phil 
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