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of/address: Add of_find_matching_node_by_address helper

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of_find_matching_node_by_address() can be used to find a device tree
node for a device at a specific address.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Grant Likely
2011-07-05 23:42:28 -06:00
parent 8c11642a50
commit 90e33f62e0
2 changed files with 22 additions and 0 deletions
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18
drivers/of/address.c
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@@ -577,6 +577,24 @@ int of_address_to_resource(struct device_node *dev, int index,
}
EXPORT_SYMBOL_GPL(of_address_to_resource);
struct device_node *of_find_matching_node_by_address(struct device_node *from,
const struct of_device_id *matches,
u64 base_address)
{
struct device_node *dn = of_find_matching_node(from, matches);
struct resource res;
while (dn) {
if (of_address_to_resource(dn, 0, &res))
continue;
if (res.start == base_address)
return dn;
dn = of_find_matching_node(dn, matches);
}
return NULL;
}
/**
* of_iomap - Maps the memory mapped IO for a given device_node