diff --git a/tools/testing/selftests/rkpinctrl/iomux.c b/tools/testing/selftests/rkpinctrl/iomux.c
index 6d829c36bc30..f17443b5a26c 100644
--- a/tools/testing/selftests/rkpinctrl/iomux.c
+++ b/tools/testing/selftests/rkpinctrl/iomux.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (c) 2022 Rockchip Electronics Co. Ltd.
+ * Copyright (c) 2022 Rockchip Electronics Co., Ltd.
  */
 
 #include <errno.h>