linux-kernel - Re: [PATCH v11 08/10] OF: PCI: Add support for parsing PCI host bridge resources from DT

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Date:	Tue, 23 Sep 2014 09:56:37 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Liviu Dudau <Liviu.Dudau@....com>,
	Robert Richter <rric@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-pci <linux-pci@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Will Deacon <Will.Deacon@....com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Tanmay Inamdar <tinamdar@....com>,
	linux-arch <linux-arch@...r.kernel.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Jingoo Han <jg1.han@...sung.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Device Tree ML <devicetree@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Sinan Kaya <okaya@...eaurora.org>,
	Sunil Goutham <sunil.goutham@...iumnetworks.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Suravee Suthikulanit <suravee.suthikulpanit@....com>
Subject: Re: [PATCH v11 08/10] OF: PCI: Add support for parsing PCI host bridge resources from DT

On Monday 22 September 2014 12:43:17 Liviu Dudau wrote:
> > 
> > From e798af4fc2f664d1aff7e863489b8298f90e716e Mon Sep 17 00:00:00 2001
> > From: Robert Richter <rrichter@...ium.com>
> > Date: Mon, 22 Sep 2014 10:46:01 +0200
> > Subject: [PATCH] OF: PCI: Fix creation of mem-mapped pci host bridges
> > 
> > The pci host bridge was not created if io_base was not set when
> > calling of_pci_get_host_bridge_resources(). This is esp. the case for
> > mem-mapped io (IORESOURCE_MEM). This patch fixes this. Function
> > parameter io_base is optional now.
> 
> I think the message is misleading. What you want to do is make io_base
> optional for the case where the PCI host bridge only expects to have only
> IORESOURCE_MEM ranges and doesn't care about IORESOURCE_IO ones.
> 
> As I'm going to touch this area again to address a comment from Bjorn,
> do you mind if I roll this patch into mine with your Signed-off-by and
> the mention that you have made io_base optional?

I think the best way to deal with this is to move the check for 
io_base down into the place where it is used: As long as the DT only
specifies IORESOURCE_MEM windows, we don't need to look at io_base,
but if the host controller driver does not support IORESOURCE_IO
while the DT specifies it, I guess it would be nice to return an
error.

	Arnd
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