diff options
| author | Grant Likely <grant.likely@secretlab.ca> | 2011-07-05 23:42:28 -0600 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2011-07-18 16:32:26 -0600 |
| commit | 90e33f62e027d330485d03598e1b2d8db3ff031c (patch) | |
| tree | 8dea43baa65a88ba28771a945f126a511024f804 | |
| parent | 8c11642a50555e584774737f7c296f9aece310cf (diff) | |
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>
| -rw-r--r-- | drivers/of/address.c | 18 | ||||
| -rw-r--r-- | include/linux/of_address.h | 4 |
2 files changed, 22 insertions, 0 deletions
diff --git a/drivers/of/address.c b/drivers/of/address.c index b4559c58c09..da1f4b9605d 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 diff --git a/include/linux/of_address.h b/include/linux/of_address.h index 2feda6ee614..bdfc20d8ff8 100644 --- a/include/linux/of_address.h +++ b/include/linux/of_address.h @@ -6,6 +6,10 @@ extern u64 of_translate_address(struct device_node *np, const __be32 *addr); extern int of_address_to_resource(struct device_node *dev, int index, struct resource *r); +extern struct device_node *of_find_matching_node_by_address( + struct device_node *from, + const struct of_device_id *matches, + u64 base_address); extern void __iomem *of_iomap(struct device_node *device, int index); /* Extract an address from a device, returns the region size and |