sys/dev: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

3 files changed, 6 insertions, 0 deletions

diff --git a/sys/dev/sio/sio.c b/sys/dev/sio/sio.c
index a6bd17607799..4fd5fbe6ffdb 100644
--- a/sys/dev/sio/sio.c
+++ b/sys/dev/sio/sio.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1991 The Regents of the University of California.
  * All rights reserved.
  *
diff --git a/sys/dev/sio/sioreg.h b/sys/dev/sio/sioreg.h
index a826411ea69b..64ba19e757bf 100644
--- a/sys/dev/sio/sioreg.h
+++ b/sys/dev/sio/sioreg.h
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1991 The Regents of the University of California.
  * All rights reserved.
  *
diff --git a/sys/dev/sio/siovar.h b/sys/dev/sio/siovar.h
index 6706986f5cfb..91a907de102c 100644
--- a/sys/dev/sio/siovar.h
+++ b/sys/dev/sio/siovar.h
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1991 The Regents of the University of California.
  * All rights reserved.
  *