From: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxx>
---
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 d6e6de5..fb92ded 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -85,3 +85,28 @@ 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 9118321..fb6e95e 100644
--- a/include/linux/of_pci.h
+++ b/include/linux/of_pci.h
@@ -12,5 +12,6 @@ struct device_node *of_pci_find_child_device(struct device_node *parent,
unsigned int devfn);
int of_pci_get_bus(struct device_node *np);
int of_pci_get_devfn(struct device_node *np);
+int of_pci_parse_bus_range(struct device_node *node, struct resource *res);
#endif
--
1.7.9.5
--
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