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-rw-r--r--drivers/of/base.c31
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.
*