diff options
| author | Thierry Reding <thierry.reding@avionic-design.de> | 2013-05-16 17:55:19 +0200 |
|---|---|---|
| committer | Jason Cooper <jason@lakedaemon.net> | 2013-05-19 20:30:10 +0000 |
| commit | 4e23d3f505e8acfeac7cc33d4113fbb5a25c3090 (patch) | |
| tree | 48184aadabb71896e0dd5295ee0daf14de81148c | |
| parent | 45ab9702fb47d18dca116b3a0509efa19fbcb27a (diff) | |
| download | linux-4e23d3f505e8acfeac7cc33d4113fbb5a25c3090.tar.bz2 | |
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>
| -rw-r--r-- | drivers/of/of_pci.c | 25 | ||||
| -rw-r--r-- | include/linux/of_pci.h | 1 |
2 files changed, 26 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); diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h index 91ec484e0045..7a04826018c0 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 |