| From: Grant Likely <grant.likely@secretlab.ca> |
| Subject: 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> |
| (cherry picked from commit 90e33f62e027d330485d03598e1b2d8db3ff031c) |
| |
| Signed-off-by: Simon Horman <horms@verge.net.au> |
| --- |
| drivers/of/address.c | 18 ++++++++++++++++++ |
| include/linux/of_address.h | 4 ++++ |
| 2 files changed, 22 insertions(+) |
| |
| 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 2feda6ee..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 |
| -- |
| 1.7.10.2.484.gcd07cc5 |
| |
| _______________________________________________ |
| LTSI-dev mailing list |
| LTSI-dev@lists.linuxfoundation.org |
| https://lists.linuxfoundation.org/mailman/listinfo/ltsi-dev |