Commit 2475a2b6 authored by Alistair Popple's avatar Alistair Popple Committed by Michael Ellerman
Browse files

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: default avatarAlistair Popple <alistair@popple.id.au>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent f6f9195b

drivers/of/base.c

+31 −0
Original line number Diff line number Diff line
@@ -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.

include/linux/of.h

+3 −0
Original line number Diff line number Diff line
@@ -292,6 +292,9 @@ extern int of_property_count_elems_of_size(const struct device_node *np, 
extern int of_property_read_u32_index(const struct device_node *np,

				       const char *propname,

				       u32 index, u32 *out_value);

extern int of_property_read_u64_index(const struct device_node *np,

				       const char *propname,

				       u32 index, u64 *out_value);

extern int of_property_read_variable_u8_array(const struct device_node *np,

					const char *propname, u8 *out_values,

					size_t sz_min, size_t sz_max);