dt: add helper to read 64-bit integers

Add a helper similar to of_property_read_u32() that handles 64-bit
integers.

v2/v3: constify device node and property name parameters.

Cc: Grant Likely <grant.likely@secretlab.ca>
Reviewed-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/of.h b/include/linux/of.h
index 53107b09cbdf..1cc9930ba06a 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -200,6 +200,8 @@ extern int of_property_read_u32_array(const struct device_node *np,
                                       const char *propname,
                                       u32 *out_values,
                                       size_t sz);
+extern int of_property_read_u64(const struct device_node *np,
+                                const char *propname, u64 *out_value);
 
 extern int of_property_read_string(struct device_node *np,
                                    const char *propname,
@@ -281,6 +283,12 @@ static inline const void *of_get_property(const struct device_node *node,
         return NULL;
 }
 
+static inline int of_property_read_u64(const struct device_node *np,
+                                       const char *propname, u64 *out_value)
+{
+        return -ENOSYS;
+}
+
 #define of_match_ptr(_ptr)      NULL
 #endif /* CONFIG_OF */