[PATCH 2/4] environment: implement of_env_get_alias_by_path helper

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

For use by board-code that wants to get the alias pointing at the
backing device of an environment node add a simple
of_env_get_alias_by_path() helper, so board code doesn't need to worry
about property name and whether the binding uses a phandle or string path.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/of/barebox.c |  5 +++++
 include/envfs.h      | 10 ++++++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/of/barebox.c b/drivers/of/barebox.c
index ed5d171e43a8..7d433e280ba5 100644
--- a/drivers/of/barebox.c
+++ b/drivers/of/barebox.c
@@ -15,6 +15,11 @@
 
 #define ENV_MNT_DIR "/boot"	/* If env on filesystem, where to mount */
 
+const char *of_env_get_alias_by_path(const char *of_path)
+{
+	return of_property_get_alias(of_path, "device-path");
+}
+
 /* If dev describes a file on a fs, mount the fs and return a pointer
  * to the file's path.  Otherwise return an error code or NULL if the
  * device path should be used.
diff --git a/include/envfs.h b/include/envfs.h
index 767b34c943de..8bfc83b6b008 100644
--- a/include/envfs.h
+++ b/include/envfs.h
@@ -118,6 +118,16 @@ static inline const char *default_environment_path_get(void)
 }
 #endif
 
+#ifdef CONFIG_OF_BAREBOX_DRIVERS
+const char *of_env_get_alias_by_path(const char *of_path);
+#else
+static inline const char *of_env_get_alias_by_path(const char *of_path)
+{
+	return NULL;
+}
+#endif
+
+
 #ifdef CONFIG_DEFAULT_ENVIRONMENT
 void defaultenv_append(void *buf, unsigned int size, const char *name);
 int defaultenv_load(const char *dir, unsigned flags);
-- 
2.39.5