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authorGrant Likely <grant.likely@secretlab.ca>2011-07-05 23:42:28 -0600
committerGrant Likely <grant.likely@secretlab.ca>2011-07-18 16:32:26 -0600
commit90e33f62e027d330485d03598e1b2d8db3ff031c (patch)
tree8dea43baa65a88ba28771a945f126a511024f804 /drivers/of/address.c
parent8c11642a50555e584774737f7c296f9aece310cf (diff)
downloadop-kernel-dev-90e33f62e027d330485d03598e1b2d8db3ff031c.zip
op-kernel-dev-90e33f62e027d330485d03598e1b2d8db3ff031c.tar.gz
of/address: Add of_find_matching_node_by_address helper
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>
Diffstat (limited to 'drivers/of/address.c')
-rw-r--r--drivers/of/address.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/of/address.c b/drivers/of/address.c
index b4559c5..da1f4b9 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -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
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