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 <alist...@popple.id.au>
Acked-by: Rob Herring <r...@kernel.org>
---
drivers/of/base.c | 31 +++++++++++++++++++++++++++++++
include/linux/of.h | 3 +++
2 files changed, 34 insertions(+)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index d7c4629..0ea16bd 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.
*
diff --git a/include/linux/of.h b/include/linux/of.h
index 21e6323..d08788d 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -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);
--
2.1.4
