linux-kernel - Re: [PATCH v12 10/12] PCI: Assign unassigned bus resources in pci_scan_root

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Message-ID: <6332476.od04BfvKGr@wuerfel>
Date:	Mon, 29 Sep 2014 20:18:02 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Liviu Dudau <liviu@...au.co.uk>,
	linux-arch <linux-arch@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Device Tree ML <devicetree@...r.kernel.org>,
	linux-pci <linux-pci@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Jingoo Han <jg1.han@...sung.com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Will Deacon <Will.Deacon@....com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Rob Herring <robh+dt@...nel.org>,
	Tanmay Inamdar <tinamdar@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Sinan Kaya <okaya@...eaurora.org>
Subject: Re: [PATCH v12 10/12] PCI: Assign unassigned bus resources in pci_scan_root_bus()

On Sunday 28 September 2014 16:16:21 Suravee Suthikulpanit wrote:
> >
> > I'm not opposed to it, but I have the same question as for setting up
> > the domain: how does pci_scan_root_bus() learn what to assign to
> > bus->msi?  It currently only gets a "void *sysdata" so there's no
> > obvious place to put it there.  You could add a pcibios interface to
> > retrieve it, I suppose, but I'm starting to get uncomfortable with
> > adding more of those because we have such a mess of them already.
> >
> 
> [Suravee] Liviu and I had a talk during Linaro Connect, and we came up
> with a new binding for the pcie controller called "msi-parent" which is
> supposed to contain phandle to the corresponded msi-controller.

Is this based on the property that we have in the pci-mvebu driver?

I hope this is meant to be compatible so we can share the implementation.

	Arnd
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