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-rw-r--r--drivers/of/base.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 8f165b112e03..4cc06c702c41 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1960,6 +1960,32 @@ int of_alias_get_id(struct device_node *np, const char *stem)
}
EXPORT_SYMBOL_GPL(of_alias_get_id);
+/**
+ * of_alias_get_highest_id - Get highest alias id for the given stem
+ * @stem: Alias stem to be examined
+ *
+ * The function travels the lookup table to get the highest alias id for the
+ * given alias stem. It returns the alias id if found.
+ */
+int of_alias_get_highest_id(const char *stem)
+{
+ struct alias_prop *app;
+ int id = -ENODEV;
+
+ mutex_lock(&of_mutex);
+ list_for_each_entry(app, &aliases_lookup, link) {
+ if (strcmp(app->stem, stem) != 0)
+ continue;
+
+ if (app->id > id)
+ id = app->id;
+ }
+ mutex_unlock(&of_mutex);
+
+ return id;
+}
+EXPORT_SYMBOL_GPL(of_alias_get_highest_id);
+
const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
u32 *pu)
{