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-rw-r--r--drivers/of/base.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 74eaedd5b860..33011b88ed3f 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -16,6 +16,7 @@
#define pr_fmt(fmt) "OF: " fmt
+#include <linux/bitmap.h>
#include <linux/console.h>
#include <linux/ctype.h>
#include <linux/cpu.h>
@@ -1943,6 +1944,57 @@ int of_alias_get_id(struct device_node *np, const char *stem)
EXPORT_SYMBOL_GPL(of_alias_get_id);
/**
+ * of_alias_get_alias_list - Get alias list for the given device driver
+ * @matches: Array of OF device match structures to search in
+ * @stem: Alias stem of the given device_node
+ * @bitmap: Bitmap field pointer
+ * @nbits: Maximum number of alias ID which can be recorded it bitmap
+ *
+ * The function travels the lookup table to record alias ids for the given
+ * device match structures and alias stem.
+ *
+ * Return: 0 or -ENOSYS when !CONFIG_OF
+ */
+int of_alias_get_alias_list(const struct of_device_id *matches,
+ const char *stem, unsigned long *bitmap,
+ unsigned int nbits)
+{
+ struct alias_prop *app;
+
+ /* Zero bitmap field to make sure that all the time it is clean */
+ bitmap_zero(bitmap, nbits);
+
+ mutex_lock(&of_mutex);
+ pr_debug("%s: Looking for stem: %s\n", __func__, stem);
+ list_for_each_entry(app, &aliases_lookup, link) {
+ pr_debug("%s: stem: %s, id: %d\n",
+ __func__, app->stem, app->id);
+
+ if (strcmp(app->stem, stem) != 0) {
+ pr_debug("%s: stem comparison doesn't passed %s\n",
+ __func__, app->stem);
+ continue;
+ }
+
+ if (app->id >= nbits) {
+ pr_debug("%s: ID %d greater then bitmap field %d\n",
+ __func__, app->id, nbits);
+ continue;
+ }
+
+ if (of_match_node(matches, app->np)) {
+ pr_debug("%s: Allocated ID %d\n", __func__, app->id);
+ set_bit(app->id, bitmap);
+ }
+ /* Alias exist but it not compatible with matches */
+ }
+ mutex_unlock(&of_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_alias_get_alias_list);
+
+/**
* of_alias_get_highest_id - Get highest alias id for the given stem
* @stem: Alias stem to be examined
*