diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 318d826..e4ed6c6 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-1.0+
 /*
  *  bus driver for ccw devices
  *