of: implement of_property_read_u64_array

For reading reg with #address-cells and #size-cells of 2,
an of_property_read_u64_array can be quite convenient.
Add one.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 41 insertions, 0 deletions

diff --git a/include/of.h b/include/of.h
index 1b3ceaff40..0f866f624b 100644
--- a/include/of.h
+++ b/include/of.h
@@ -201,6 +201,11 @@ extern int of_property_read_u32_array(const struct device_node *np,
 extern int of_property_read_u64(const struct device_node *np,
 				const char *propname, u64 *out_value);
 
+extern int of_property_read_variable_u64_array(const struct device_node *np,
+					const char *propname,
+					u64 *out_values,
+					size_t sz);
+
 extern int of_property_read_string(struct device_node *np,
 				   const char *propname,
 				   const char **out_string);
@@ -467,6 +472,14 @@ static inline int of_property_read_u64(const struct device_node *np,
 	return -ENOSYS;
 }
 
+static inline int of_property_read_variable_u64_array(const struct device_node *np,
+					const char *propname,
+					u64 *out_values,
+					size_t sz)
+{
+	return -ENOSYS;
+}
+
 static inline int of_property_read_string(struct device_node *np,
 				const char *propname, const char **out_string)
 {
@@ -877,6 +890,34 @@ static inline int of_property_read_u32(const struct device_node *np,
 	return of_property_read_u32_array(np, propname, out_value, 1);
 }
 
+/**
+ * of_property_read_u64_array - Find and read an array of 64 bit integers
+ * from a property.
+ *
+ * @np:		device node from which the property value is to be read.
+ * @propname:	name of the property to be searched.
+ * @out_values:	pointer to return value, modified only if return value is 0.
+ * @sz:		number of array elements to read
+ *
+ * Search for a property in a device node and read 64-bit value(s) 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_values is modified only if a valid u64 value can be decoded.
+ */
+static inline int of_property_read_u64_array(const struct device_node *np,
+					     const char *propname,
+					     u64 *out_values, size_t sz)
+{
+	int ret = of_property_read_variable_u64_array(np, propname, out_values,
+						      sz);
+	if (ret >= 0)
+		return 0;
+	else
+		return ret;
+}
+
 /*
  * struct property *prop;
  * const __be32 *p;