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

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Message-Id: <390B3F94-C058-47D6-82CE-0393E60014FF@codeaurora.org>
Date:	Mon, 2 Jun 2014 10:40:30 -0500
From:	Kumar Gala <galak@...eaurora.org>
To:	Grant Likely <grant.likely@...aro.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 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.

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

- k

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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