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/drivers/of/base.c b/drivers/of/base.c
index b8b65fddbeb5..57ec27bed44f 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -639,7 +639,7 @@ EXPORT_SYMBOL_GPL(of_property_read_u32);
  * The out_string pointer is modified only if a valid string can be decoded.
  */
 int of_property_read_string(struct device_node *np, char *propname,
-                                char **out_string)
+                                const char **out_string)
 {
         struct property *prop = of_find_property(np, propname, NULL);
         if (!prop)