dt: add 'const' for of_property_read_string parameter **out_string

The existing dt codes usually call of_get_property to get a string
property and save it as a 'const char *'.  The patch adds'const' for
of_property_read_string parameter **out_string to make the converting
of existing code a little easier.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/of.h b/include/linux/of.h
index 4fc4c1b8d5d5..b23852002b30 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -198,7 +198,7 @@ extern struct property *of_find_property(const struct device_node *np,
 extern int of_property_read_u32(struct device_node *np, char *propname,
                                         u32 *out_value);
 extern int of_property_read_string(struct device_node *np, char *propname,
-                                        char **out_string);
+                                        const char **out_string);
 extern int of_device_is_compatible(const struct device_node *device,
                                    const char *);
 extern int of_device_is_available(const struct device_node *device);