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authorThierry Reding <thierry.reding@avionic-design.de>2013-05-16 19:55:19 +0400
committerJason Cooper <jason@lakedaemon.net>2013-05-20 00:30:10 +0400
commit4e23d3f505e8acfeac7cc33d4113fbb5a25c3090 (patch)
tree48184aadabb71896e0dd5295ee0daf14de81148c /drivers/of
parent45ab9702fb47d18dca116b3a0509efa19fbcb27a (diff)
downloadlinux-4e23d3f505e8acfeac7cc33d4113fbb5a25c3090.tar.xz
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@avionic-design.de> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/of_pci.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 4dd7b9b80076..42c687a820ac 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);