提交 90e33f62 编写于 作者: G Grant Likely

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: NGrant Likely <grant.likely@secretlab.ca>
上级 8c11642a
......@@ -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
......
......@@ -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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