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Commit 4e23d3f5 authored by Thierry Reding's avatar Thierry Reding Committed by Jason Cooper
Browse files

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: default avatarThierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
parent 45ab9702

drivers/of/of_pci.c

+25 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/of_pci.h

+1 −0
Original line number Diff line number Diff line
@@ -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