diff options
author | Alistair Popple <alistair@popple.id.au> | 2017-04-03 19:51:42 +1000 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-03 23:35:59 +1000 |
commit | 2475a2b6c877a0c8d1ca42c3f2b30f8ce518ac0b (patch) | |
tree | b4413f8113475bc42b6f7dd3a371ba6b568f70eb /drivers/of | |
parent | f6f9195ba0b0b1406af384037d9e7eb8215aca98 (diff) |
drivers/of/base.c: Add of_property_read_u64_index
There is of_property_read_u32_index but no u64 variant. This patch
adds one similar to the u32 version for u64.
Signed-off-by: Alistair Popple <alistair@popple.id.au>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/of')
-rw-r--r-- | drivers/of/base.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index d7c4629a3a2d..0ea16bd3c8f1 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -1213,6 +1213,37 @@ int of_property_read_u32_index(const struct device_node *np, EXPORT_SYMBOL_GPL(of_property_read_u32_index); /** + * of_property_read_u64_index - Find and read a u64 from a multi-value property. + * + * @np: device node from which the property value is to be read. + * @propname: name of the property to be searched. + * @index: index of the u64 in the list of values + * @out_value: pointer to return value, modified only if no error. + * + * Search for a property in a device node and read nth 64-bit value from + * it. Returns 0 on success, -EINVAL if the property does not exist, + * -ENODATA if property does not have a value, and -EOVERFLOW if the + * property data isn't large enough. + * + * The out_value is modified only if a valid u64 value can be decoded. + */ +int of_property_read_u64_index(const struct device_node *np, + const char *propname, + u32 index, u64 *out_value) +{ + const u64 *val = of_find_property_value_of_size(np, propname, + ((index + 1) * sizeof(*out_value)), + 0, NULL); + + if (IS_ERR(val)) + return PTR_ERR(val); + + *out_value = be64_to_cpup(((__be64 *)val) + index); + return 0; +} +EXPORT_SYMBOL_GPL(of_property_read_u64_index); + +/** * of_property_read_variable_u8_array - Find and read an array of u8 from a * property, with bounds on the minimum and maximum array size. * |