linux-kernel - Re: [RFC PATCH RESEND v2] of/pci: Provide support for parsing PCI DT ranges property

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Date:	Fri, 22 Mar 2013 09:39:36 +0000
From:	Andrew Murray <andrew.murray@....com>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Liviu Dudau <Liviu.Dudau@....com>
Subject: Re: [RFC PATCH RESEND v2] of/pci: Provide support for parsing PCI
 DT ranges property

On Thu, Mar 21, 2013 at 04:06:25PM +0000, Thomas Petazzoni wrote:
> Dear Andrew Murray,
> 
> On Fri,  1 Mar 2013 12:23:36 +0000, Andrew Murray wrote:
> > This patch factors out common implementations patterns to reduce overall kernel
> > code and provide a means for host bridge drivers to directly obtain struct
> > resources from the DT's ranges property without relying on architecture specific
> > DT handling. This will make it easier to write archiecture independent host bridge
> > drivers and mitigate against further duplication of DT parsing code.
> > 
> > This patch can be used in the following way:
> > 
> > 	struct of_pci_range_iter iter;
> > 	for_each_of_pci_range(&iter, np) {
> > 
> > 		//directly access properties of the address range, e.g.:
> > 		//iter.pci_space, iter.pci_addr, iter.cpu_addr, iter.size or
> > 		//iter.flags
> > 
> > 		//alternatively obtain a struct resource, e.g.:
> > 		//struct resource res;
> > 		//range_iter_fill_resource(iter, np, res);
> > 	}
> > 
> > Additionally the implementation takes care of adjacent ranges and merges them
> > into a single range (as was the case with powerpc and microblaze).
> > 
> > The modifications to microblaze, mips and powerpc have not been tested.
> > 
> > v2:
> >   This follows on from suggestions made by Grant Likely
> >   (marc.info/?l=linux-kernel&m=136079602806328)
> > 
> > Signed-off-by: Andrew Murray <Andrew.Murray@....com>
> > Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
> 
> Thanks, I've tested this successfully with the Marvell PCIe driver. I'm
> about to send a new version of the Marvell PCIe patch set that includes
> this RFC proposal.
> 
> I only made two small changes compared to your version, detailed below.

Thanks for the feedback, all looks good to me. Do I need to give ack?

Andrew Murray
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