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Subject[RFC PATCH 02/11] of/address: Add of_find_matching_node_by_address helper
From
Date
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>
---
drivers/of/address.c | 18 ++++++++++++++++++
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 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
diff --git a/include/linux/of_address.h b/include/linux/of_address.h
index 2feda6e..bdfc20d 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


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