diff --git a/lib/logic_pio.c b/lib/logic_pio.c
index f32fe48..07b4b9a 100644
--- a/lib/logic_pio.c
+++ b/lib/logic_pio.c
@@ -28,6 +28,8 @@ static DEFINE_MUTEX(io_range_mutex);
  * @new_range: pointer to the IO range to be registered.
  *
  * Returns 0 on success, the error code in case of failure.
+ * If the range already exists, -EEXIST will be returned, which should be
+ * considered a success.
  *
  * Register a new IO range node in the IO range list.
  */
@@ -51,6 +53,7 @@ int logic_pio_register_range(struct logic_pio_hwaddr *new_range)
 	list_for_each_entry(range, &io_range_list, list) {
 		if (range->fwnode == new_range->fwnode) {
 			/* range already there */
+			ret = -EEXIST;
 			goto end_register;
 		}
 		if (range->flags == LOGIC_PIO_CPU_MMIO &&