diff options
| author | Rob Herring <robh@kernel.org> | 2023-03-28 23:16:00 +0300 |
|---|---|---|
| committer | Rob Herring <robh@kernel.org> | 2023-04-14 01:46:35 +0300 |
| commit | ff61bacd77f258bd2ed145efb69e5449b115d4fe (patch) | |
| tree | 66a4d268d0aa376f86b6fe023be2568a63319b72 /drivers/of/address.c | |
| parent | b50c788a56964a900ebcc817c8a5ad35ddad87b6 (diff) | |
| download | linux-ff61bacd77f258bd2ed145efb69e5449b115d4fe.tar.xz | |
of/address: Add of_property_read_reg() helper
Add a helper, of_property_read_reg(), to read "reg" entries untranslated
address and size. This function is intended mainly for cases with an
untranslatable "reg" address (i.e. not MMIO). There's also a few
translatable cases such as address cells containing a bus chip-select
number.
Link: https://lore.kernel.org/r/20230328-dt-address-helpers-v1-5-e2456c3e77ab@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'drivers/of/address.c')
| -rw-r--r-- | drivers/of/address.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/of/address.c b/drivers/of/address.c index 8cfae24148e0..fdb15c6fb3b1 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -760,6 +760,29 @@ const __be32 *__of_get_address(struct device_node *dev, int index, int bar_no, } EXPORT_SYMBOL(__of_get_address); +/** + * of_property_read_reg - Retrieve the specified "reg" entry index without translating + * @np: device tree node for which to retrieve "reg" from + * @idx: "reg" entry index to read + * @addr: return value for the untranslated address + * @size: return value for the entry size + * + * Returns -EINVAL if "reg" is not found. Returns 0 on success with addr and + * size values filled in. + */ +int of_property_read_reg(struct device_node *np, int idx, u64 *addr, u64 *size) +{ + const __be32 *prop = of_get_address(np, idx, size, NULL); + + if (!prop) + return -EINVAL; + + *addr = of_read_number(prop, of_n_addr_cells(np)); + + return 0; +} +EXPORT_SYMBOL(of_property_read_reg); + static int parser_init(struct of_pci_range_parser *parser, struct device_node *node, const char *name) { |