linux-kernel - Re: [PATCH v2 03/18] PCI: designware: Configuration space should be specified in 'reg'

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Message-ID: <20140529151840.GD1677@bart.dudau.co.uk>
Date:	Thu, 29 May 2014 16:18:40 +0100
From:	"Liviu Dudau" <liviu@...au.co.uk>
To:	Kumar Gala <galak@...eaurora.org>
Cc:	Kishon Vijay Abraham I <kishon@...com>, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Marek Vasut <marex@...x.de>,
	arnd@...db.de, tony@...mide.com, Mohit Kumar <mohit.kumar@...com>,
	jg1.han@...sung.com,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v2 03/18] PCI: designware: Configuration space should be
 specified in 'reg'

On Thu, May 29, 2014 at 10:03:54AM -0500, Kumar Gala wrote:
> 
> On May 29, 2014, at 1:38 AM, Kishon Vijay Abraham I <kishon@...com> wrote:
> 
> > The configuration address space has so far been specified in *ranges*,
> > however it should be specified in *reg* making it a platform MEM resource.
> > Hence used 'platform_get_resource_*' API to get configuration address
> > space in the designware driver.
> > 
> > Cc: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
> > Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> > Cc: Mohit Kumar <mohit.kumar@...com>
> > Cc: Jingoo Han <jg1.han@...sung.com>
> > Cc: Marek Vasut <marex@...x.de>
> > Cc: Arnd Bergmann <arnd@...db.de>
> > Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> > ---
> > .../devicetree/bindings/pci/designware-pcie.txt    |    1 +
> > drivers/pci/host/pcie-designware.c                 |   17 +++++++++++++++--
> > 2 files changed, 16 insertions(+), 2 deletions(-)
> 
> Why should the cfg space be defined in *reg* instead of ranges?

Because what you end up using is a struct resource to represent the cfg space and
the conversion between ranges and resources breaks down for CFG space (we don't
have a flag in the resource flags to say this is CFG resource). Specifying it
as a *reg* property makes it a MEM resource and no special casing is needed.

Best regards,
Liviu

> 
> - 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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