linux-kernel - Re: [PATCH v3] of/pci: Provide support for parsing PCI DT ranges property

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Message-ID: <20130327130418.GA10480@avionic-0098.mockup.avionic-design.de>
Date:	Wed, 27 Mar 2013 14:04:18 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Andrew Murray <Andrew.Murray@....com>
Cc:	'Bjorn Helgaas' <bhelgaas@...gle.com>,
	'Grant Likely' <grant.likely@...retlab.ca>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Jingoo Han <jg1.han@...sung.com>,
	'Kukjin Kim' <kgene.kim@...sung.com>,
	'Jason Gunthorpe' <jgunthorpe@...idianresearch.com>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	'Siva Reddy Kallam' <siva.kallam@...sung.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	'Surendranath Gurivireddy Balla' <suren.reddy@...sung.com>,
	'Thomas Abraham' <thomas.abraham@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Arnd Bergmann <arnd@...db.de>,
	Liviu Dudau <Liviu.Dudau@....com>
Subject: Re: [PATCH v3] of/pci: Provide support for parsing PCI DT ranges
 property

On Tue, Mar 26, 2013 at 04:20:23PM +0000, Andrew Murray wrote:
> This patch factors out common implementation 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_parser parser;
> 	struct of_pci_range range;
> 
> 	if (of_pci_range_parser(&parser, np))
> 		; //no ranges property
> 
> 	for_each_of_pci_range(&parser, &range) {
> 
> 		/*
> 			directly access properties of the address range, e.g.:
> 			range.pci_space, range.pci_addr, range.cpu_addr,
> 			range.size, range.flags
> 
> 			alternatively obtain a struct resource, e.g.:
> 			struct resource res;
> 			of_pci_range_to_resource(&range, 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.
> 
> Signed-off-by: Andrew Murray <Andrew.Murray@....com>
> Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>

Tested-by: Thierry Reding <thierry.reding@...onic-design.de>

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