linux-kernel - Re: [PATCH 1/6] of/pci: Provide support for parsing PCI DT ranges property

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Date:	Sat, 23 Mar 2013 14:37:04 +0100
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Jingoo Han <jg1.han@...sung.com>,
	'Kukjin Kim' <kgene.kim@...sung.com>,
	'Bjorn Helgaas' <bhelgaas@...gle.com>,
	'Jason Gunthorpe' <jgunthorpe@...idianresearch.com>,
	linux-samsung-soc@...r.kernel.org,
	'Siva Reddy Kallam' <siva.kallam@...sung.com>,
	linux-pci@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	'Thierry Reding' <thierry.reding@...onic-design.de>,
	linux-kernel@...r.kernel.org,
	'Grant Likely' <grant.likely@...retlab.ca>,
	'Surendranath Gurivireddy Balla' <suren.reddy@...sung.com>,
	'Thomas Abraham' <thomas.abraham@...aro.org>,
	'Andrew Murray' <andrew.murray@....com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/6] of/pci: Provide support for parsing PCI DT ranges
 property


On Sat, 23 Mar 2013 10:41:56 +0000, Russell King - ARM Linux wrote:

> Please look at how IORESOURCE_* stuff is defined:
> #define IORESOURCE_TYPE_BITS    0x00001f00      /* Resource type */
> #define IORESOURCE_IO           0x00000100      /* PCI/ISA I/O ports */
> #define IORESOURCE_MEM          0x00000200
> #define IORESOURCE_REG          0x00000300      /* Register offsets */
> #define IORESOURCE_IRQ          0x00000400
> #define IORESOURCE_DMA          0x00000800
> #define IORESOURCE_BUS          0x00001000
> 
> Notice that it's not an array of bits.
> 
> So this should be:
> 		if ((iter.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO) {

What I've done for the Marvell PCIe driver is:

+	for_each_of_pci_range(&iter, np) {
+		unsigned long restype = iter.flags & IORESOURCE_TYPE_BITS;
+		if (restype == IORESOURCE_IO) {
[...]
+		if (restype == IORESOURCE_MEM) {
[...]

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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