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Commit 90e33f62 authored by Grant Likely's avatar Grant Likely
Browse files

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: default avatarGrant Likely <grant.likely@secretlab.ca>
parent 8c11642a

drivers/of/address.c

+18 −0
Original line number Diff line number Diff line
@@ -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

include/linux/of_address.h

+4 −0
Original line number Diff line number Diff line
@@ -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