linux-kernel - Re: [PATCH 05/17] pci: host: pcie-dra7xx: add support for pcie-dra7xx controller

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Date:	Wed, 07 May 2014 11:25:45 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Kishon Vijay Abraham I <kishon@...com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Marek Vasut <marex@...x.de>, devicetree@...r.kernel.org,
	balajitk@...com, linux-doc@...r.kernel.org,
	linux-pci@...r.kernel.org, Jingoo Han <jg1.han@...sung.com>,
	linux-kernel@...r.kernel.org, Mohit Kumar <mohit.kumar@...com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-omap@...r.kernel.org, rogerq@...com
Subject: Re: [PATCH 05/17] pci: host: pcie-dra7xx: add support for pcie-dra7xx controller

On Wednesday 07 May 2014 14:52:47 Kishon Vijay Abraham I wrote:
> On Tuesday 06 May 2014 10:05 PM, Jason Gunthorpe wrote:
> > On Tue, May 06, 2014 at 07:03:51PM +0530, Kishon Vijay Abraham I wrote:
> >> +Example:
> >> +pcie@...00000 {
> >> +    compatible = "ti,dra7xx-pcie";
> >> +    reg = <0x51002000 0x14c>, <0x51000000 0x2000>;
> >> +    reg-names = "ti_conf", "rc_dbics";
> >> +    interrupts = <0 232 0x4>, <0 233 0x4>;
> >> +    #address-cells = >;
> >> +    #size-cells = <2>;
> >> +    device_type = "pci";
> >> +    ti,device_type = >;
> >> +    ranges = <0x00000800 0 0x20001000 0x20001000 0 0x00002000  /* Configuration Space */
> > 
> > Configuration space should not show up in the ranges, please don't
> > copy that mistake from other drivers, put it in reg.
> 
> But then it needs pcie-designware.c to be modified and it will be breaking
> other platforms no?

I think the pcie-designware driver should be changed to allow either way.
Ideally we would deprecate the existing method in a way that for new front-ends
it doesn't work, but the old front-ends can still deal with it but also work
if you put it into the reg property.

	Arnd
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