From 2475a2b6c877a0c8d1ca42c3f2b30f8ce518ac0b Mon Sep 17 00:00:00 2001 From: Alistair Popple Date: Mon, 3 Apr 2017 19:51:42 +1000 Subject: 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 Acked-by: Rob Herring Signed-off-by: Michael Ellerman --- drivers/of/base.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) (limited to 'drivers/of') 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 @@ -1212,6 +1212,37 @@ 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. -- cgit