linux-kernel - Re: [PATCH 1/2] pci: Add IORESOURCE_BIT entry for PCIe ECAM resources.

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Message-Id: <20140602162306.4AB0FC40476@trevor.secretlab.ca>
Date:	Mon, 02 Jun 2014 17:23:06 +0100
From:	Grant Likely <grant.likely@...aro.org>
To:	Kumar Gala <galak@...eaurora.org>
Cc:	Arnd Bergmann <arnd@...db.de>, Liviu Dudau <Liviu.Dudau@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Rob Herring <robherring2@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH 1/2] pci: Add IORESOURCE_BIT entry for PCIe ECAM
 resources.

On Mon, 2 Jun 2014 10:40:30 -0500, Kumar Gala <galak@...eaurora.org> wrote:
> 
> On Jun 2, 2014, at 10:09 AM, Grant Likely <grant.likely@...aro.org> wrote:
> 
> > On Sat, 31 May 2014 20:41:04 +0200, Arnd Bergmann <arnd@...db.de> wrote:
> >> On Saturday 31 May 2014 01:36:40 Liviu Dudau wrote:
> >>> We would like to be able to describe PCIe ECAM resources as
> >>> IORESOURCE_MEM blocks while distinguish them from standard
> >>> memory resources. Add an IORESOURCE_BIT entry for this case.
> >>> 
> >>> Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
> >> 
> >> I still don't see any value in this at all. What is the advantage
> >> of doing this opposed to just having a standardized 'reg' property
> >> for a particular compatible string?
> > 
> > I'm inclined to agree. It doesn't seem appropriate to put config space
> > in ranges, and the host controller binding is responsible for
> > identifying how config space is memory mapped.
> > 
> > g.
> 
> I don’t agree when it comes to ECAM, but we can drop this for now
> until someone really does that.

Okay, humor me then. What would a ranges property look like for ECAM? Do
you have an example? I believe there would need to be a separate entry
for each and every PCI device on the bus to get the config spaces to be
contiguous.

> However, what do we do with the 2 cases that exist in upstream that
> are using ranges for cfg space?

Ignore them in the core code? Make the specific host controller handle
them I would think.

g.

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