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Date: Wed, 3 Apr 2013 16:45:09 +0200 From: Thierry Reding <thierry.reding@...onic-design.de> To: Grant Likely <grant.likely@...retlab.ca>, Rob Herring <rob.herring@...xeda.com>, Stephen Warren <swarren@...dotorg.org>, Bjorn Helgaas <bhelgaas@...gle.com> Cc: Russell King <linux@....linux.org.uk>, Andrew Murray <andrew.murray@....com>, Jason Gunthorpe <jgunthorpe@...idianresearch.com>, Arnd Bergmann <arnd@...db.de>, Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>, devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org, linux-pci@...r.kernel.org Subject: [PATCH v3 03/12] of/pci: Add of_pci_parse_bus_range() function This function can be used to parse a bus-range property as specified by device nodes representing PCI bridges. Signed-off-by: Thierry Reding <thierry.reding@...onic-design.de> --- drivers/of/of_pci.c | 25 +++++++++++++++++++++++++ include/linux/of_pci.h | 1 + 2 files changed, 26 insertions(+) diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c index 4dd7b9b..42c687a 100644 --- a/drivers/of/of_pci.c +++ b/drivers/of/of_pci.c @@ -64,3 +64,28 @@ int of_pci_get_devfn(struct device_node *np) return (be32_to_cpup(reg) >> 8) & 0xff; } EXPORT_SYMBOL_GPL(of_pci_get_devfn); + +/** + * of_pci_parse_bus_range() - parse the bus-range property of a PCI device + * @node: device node + * @res: address to a struct resource to return the bus-range + * + * Returns 0 on success or a negative error-code on failure. + */ +int of_pci_parse_bus_range(struct device_node *node, struct resource *res) +{ + const __be32 *values; + int len; + + values = of_get_property(node, "bus-range", &len); + if (!values || len < sizeof(*values) * 2) + return -EINVAL; + + res->name = node->name; + res->start = be32_to_cpup(values++); + res->end = be32_to_cpup(values); + res->flags = IORESOURCE_BUS; + + return 0; +} +EXPORT_SYMBOL_GPL(of_pci_parse_bus_range); diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h index 91ec484..7a04826 100644 --- a/include/linux/of_pci.h +++ b/include/linux/of_pci.h @@ -11,5 +11,6 @@ struct device_node; struct device_node *of_pci_find_child_device(struct device_node *parent, unsigned int devfn); int of_pci_get_devfn(struct device_node *np); +int of_pci_parse_bus_range(struct device_node *node, struct resource *res); #endif -- 1.8.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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