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    Subject[RFC PATCH 02/11] of/address: Add of_find_matching_node_by_address helper
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    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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