[libgpiod,2/3] licensing: relicense non-library code under GPL-2.0-or-later

diff --git a/Makefile.am b/Makefile.am
index 203c291..0e44305 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 ACLOCAL_AMFLAGS = -I m4
@@ -8,6 +8,7 @@  SUBDIRS = include lib
 EXTRA_DIST = \
 	LICENSES/CC-BY-SA-4.0.txt \
 	LICENSES/GPL-2.0-only.txt \
+	LICENSES/GPL-2.0-or-later.txt \
 	LICENSES/LGPL-2.1-or-later.txt \
 	LICENSES/Linux-syscall-note.txt
 
diff --git a/autogen.sh b/autogen.sh
index 7d21070..420b821 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,5 +1,5 @@ 
 #!/bin/sh
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 # SPDX-FileCopyrightText: 2017 Thierry Reding <treding@nvidia.com>
 
diff --git a/bindings/Makefile.am b/bindings/Makefile.am
index c5301f9..8f8c762 100644
--- a/bindings/Makefile.am
+++ b/bindings/Makefile.am
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 SUBDIRS = .
diff --git a/bindings/cxx/Makefile.am b/bindings/cxx/Makefile.am
index 23c03f4..655d1cd 100644
--- a/bindings/cxx/Makefile.am
+++ b/bindings/cxx/Makefile.am
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 lib_LTLIBRARIES = libgpiodcxx.la
diff --git a/bindings/cxx/examples/Makefile.am b/bindings/cxx/examples/Makefile.am
index bdd951d..748b581 100644
--- a/bindings/cxx/examples/Makefile.am
+++ b/bindings/cxx/examples/Makefile.am
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 AM_CPPFLAGS = -I$(top_srcdir)/bindings/cxx/ -I$(top_srcdir)/include
diff --git a/bindings/cxx/examples/gpiodetectcxx.cpp b/bindings/cxx/examples/gpiodetectcxx.cpp
index 84dff9d..872cd96 100644
--- a/bindings/cxx/examples/gpiodetectcxx.cpp
+++ b/bindings/cxx/examples/gpiodetectcxx.cpp
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 /* C++ reimplementation of the gpiodetect tool. */
diff --git a/bindings/cxx/examples/gpiofindcxx.cpp b/bindings/cxx/examples/gpiofindcxx.cpp
index cafcbb1..0bccd94 100644
--- a/bindings/cxx/examples/gpiofindcxx.cpp
+++ b/bindings/cxx/examples/gpiofindcxx.cpp
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 /* C++ reimplementation of the gpiofind tool. */
diff --git a/bindings/cxx/examples/gpiogetcxx.cpp b/bindings/cxx/examples/gpiogetcxx.cpp
index 486ff57..94b3dac 100644
--- a/bindings/cxx/examples/gpiogetcxx.cpp
+++ b/bindings/cxx/examples/gpiogetcxx.cpp
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 /* Simplified C++ reimplementation of the gpioget tool. */
diff --git a/bindings/cxx/examples/gpioinfocxx.cpp b/bindings/cxx/examples/gpioinfocxx.cpp
index 76b7bc1..2175adc 100644
--- a/bindings/cxx/examples/gpioinfocxx.cpp
+++ b/bindings/cxx/examples/gpioinfocxx.cpp
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 /* Simplified C++ reimplementation of the gpioinfo tool. */
diff --git a/bindings/cxx/examples/gpiomoncxx.cpp b/bindings/cxx/examples/gpiomoncxx.cpp
index 6b199c4..4d6ac6e 100644
--- a/bindings/cxx/examples/gpiomoncxx.cpp
+++ b/bindings/cxx/examples/gpiomoncxx.cpp
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 /* Simplified C++ reimplementation of the gpiomon tool. */
diff --git a/bindings/cxx/examples/gpiosetcxx.cpp b/bindings/cxx/examples/gpiosetcxx.cpp
index fb093cb..71b27a9 100644
--- a/bindings/cxx/examples/gpiosetcxx.cpp
+++ b/bindings/cxx/examples/gpiosetcxx.cpp
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 /* Simplified C++ reimplementation of the gpioset tool. */
diff --git a/bindings/cxx/tests/Makefile.am b/bindings/cxx/tests/Makefile.am
index 3599c02..cbdecdc 100644
--- a/bindings/cxx/tests/Makefile.am
+++ b/bindings/cxx/tests/Makefile.am
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 AM_CPPFLAGS = -I$(top_srcdir)/bindings/cxx/ -I$(top_srcdir)/include
diff --git a/bindings/cxx/tests/gpiod-cxx-test-main.cpp b/bindings/cxx/tests/gpiod-cxx-test-main.cpp
index 7343c1a..11bf8e5 100644
--- a/bindings/cxx/tests/gpiod-cxx-test-main.cpp
+++ b/bindings/cxx/tests/gpiod-cxx-test-main.cpp
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #define CATCH_CONFIG_MAIN
diff --git a/bindings/cxx/tests/gpiod-cxx-test.cpp b/bindings/cxx/tests/gpiod-cxx-test.cpp
index 1f1f20f..834f372 100644
--- a/bindings/cxx/tests/gpiod-cxx-test.cpp
+++ b/bindings/cxx/tests/gpiod-cxx-test.cpp
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <linux/version.h>
diff --git a/bindings/cxx/tests/tests-chip.cpp b/bindings/cxx/tests/tests-chip.cpp
index bf4db0d..a84b150 100644
--- a/bindings/cxx/tests/tests-chip.cpp
+++ b/bindings/cxx/tests/tests-chip.cpp
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <catch2/catch.hpp>
diff --git a/bindings/cxx/tests/tests-event.cpp b/bindings/cxx/tests/tests-event.cpp
index 25cccde..aeb50dd 100644
--- a/bindings/cxx/tests/tests-event.cpp
+++ b/bindings/cxx/tests/tests-event.cpp
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <catch2/catch.hpp>
diff --git a/bindings/cxx/tests/tests-iter.cpp b/bindings/cxx/tests/tests-iter.cpp
index 11243c9..848889b 100644
--- a/bindings/cxx/tests/tests-iter.cpp
+++ b/bindings/cxx/tests/tests-iter.cpp
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <catch2/catch.hpp>
diff --git a/bindings/cxx/tests/tests-line.cpp b/bindings/cxx/tests/tests-line.cpp
index 01f785d..c1ad8d2 100644
--- a/bindings/cxx/tests/tests-line.cpp
+++ b/bindings/cxx/tests/tests-line.cpp
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <catch2/catch.hpp>
diff --git a/bindings/python/Makefile.am b/bindings/python/Makefile.am
index fd4092d..4405d8f 100644
--- a/bindings/python/Makefile.am
+++ b/bindings/python/Makefile.am
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 pyexec_LTLIBRARIES = gpiod.la
diff --git a/bindings/python/examples/Makefile.am b/bindings/python/examples/Makefile.am
index c9bee28..4169469 100644
--- a/bindings/python/examples/Makefile.am
+++ b/bindings/python/examples/Makefile.am
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 EXTRA_DIST =				\
diff --git a/bindings/python/examples/gpiodetect.py b/bindings/python/examples/gpiodetect.py
index 665f07a..da6ee9a 100755
--- a/bindings/python/examples/gpiodetect.py
+++ b/bindings/python/examples/gpiodetect.py
@@ -1,5 +1,5 @@ 
 #!/usr/bin/env python3
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 '''Reimplementation of the gpiodetect tool in Python.'''
diff --git a/bindings/python/examples/gpiofind.py b/bindings/python/examples/gpiofind.py
index 74aff8e..117d583 100755
--- a/bindings/python/examples/gpiofind.py
+++ b/bindings/python/examples/gpiofind.py
@@ -1,5 +1,5 @@ 
 #!/usr/bin/env python3
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 '''Reimplementation of the gpiofind tool in Python.'''
diff --git a/bindings/python/examples/gpioget.py b/bindings/python/examples/gpioget.py
index 6cff18b..26a2ced 100755
--- a/bindings/python/examples/gpioget.py
+++ b/bindings/python/examples/gpioget.py
@@ -1,5 +1,5 @@ 
 #!/usr/bin/env python3
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 '''Simplified reimplementation of the gpioget tool in Python.'''
diff --git a/bindings/python/examples/gpioinfo.py b/bindings/python/examples/gpioinfo.py
index 238e04c..84188f1 100755
--- a/bindings/python/examples/gpioinfo.py
+++ b/bindings/python/examples/gpioinfo.py
@@ -1,5 +1,5 @@ 
 #!/usr/bin/env python3
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 '''Simplified reimplementation of the gpioinfo tool in Python.'''
diff --git a/bindings/python/examples/gpiomon.py b/bindings/python/examples/gpiomon.py
index 891760e..b29f3ce 100755
--- a/bindings/python/examples/gpiomon.py
+++ b/bindings/python/examples/gpiomon.py
@@ -1,5 +1,5 @@ 
 #!/usr/bin/env python3
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 '''Simplified reimplementation of the gpiomon tool in Python.'''
diff --git a/bindings/python/examples/gpioset.py b/bindings/python/examples/gpioset.py
index 947e916..63e08dc 100755
--- a/bindings/python/examples/gpioset.py
+++ b/bindings/python/examples/gpioset.py
@@ -1,5 +1,5 @@ 
 #!/usr/bin/env python3
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 '''Simplified reimplementation of the gpioset tool in Python.'''
diff --git a/bindings/python/tests/Makefile.am b/bindings/python/tests/Makefile.am
index 7c8bb5e..972b669 100644
--- a/bindings/python/tests/Makefile.am
+++ b/bindings/python/tests/Makefile.am
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 dist_bin_SCRIPTS = gpiod_py_test.py
diff --git a/bindings/python/tests/gpiod_py_test.py b/bindings/python/tests/gpiod_py_test.py
index a1e22e8..f264db3 100755
--- a/bindings/python/tests/gpiod_py_test.py
+++ b/bindings/python/tests/gpiod_py_test.py
@@ -1,5 +1,5 @@ 
 #!/usr/bin/env python3
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 import errno
diff --git a/configure.ac b/configure.ac
index 32b50a8..70896ce 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 AC_PREREQ([2.69])
diff --git a/include/Makefile.am b/include/Makefile.am
index dcbfde0..7f986ec 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 include_HEADERS = gpiod.h
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 1bc86e0..d8b19f0 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 lib_LTLIBRARIES = libgpiod.la
diff --git a/man/Makefile.am b/man/Makefile.am
index c6d589f..4d2c29b 100644
--- a/man/Makefile.am
+++ b/man/Makefile.am
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 if WITH_MANPAGES
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 04fa3b2..49aa215 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 SUBDIRS = mockup
diff --git a/tests/gpiod-test.c b/tests/gpiod-test.c
index 46249a7..2681278 100644
--- a/tests/gpiod-test.c
+++ b/tests/gpiod-test.c
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <errno.h>
diff --git a/tests/gpiod-test.h b/tests/gpiod-test.h
index 9b9e4ba..2688d3c 100644
--- a/tests/gpiod-test.h
+++ b/tests/gpiod-test.h
@@ -1,4 +1,4 @@ 
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 /* SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com> */
 
 /*
diff --git a/tests/mockup/Makefile.am b/tests/mockup/Makefile.am
index af29a95..36cd397 100644
--- a/tests/mockup/Makefile.am
+++ b/tests/mockup/Makefile.am
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 lib_LTLIBRARIES = libgpiomockup.la
diff --git a/tests/tests-bulk.c b/tests/tests-bulk.c
index d079003..ad08f2d 100644
--- a/tests/tests-bulk.c
+++ b/tests/tests-bulk.c
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <errno.h>
diff --git a/tests/tests-chip.c b/tests/tests-chip.c
index 6713565..928dc49 100644
--- a/tests/tests-chip.c
+++ b/tests/tests-chip.c
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <errno.h>
diff --git a/tests/tests-event.c b/tests/tests-event.c
index a213bf0..53d3e8c 100644
--- a/tests/tests-event.c
+++ b/tests/tests-event.c
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <errno.h>
diff --git a/tests/tests-line.c b/tests/tests-line.c
index 8de1e6a..3985990 100644
--- a/tests/tests-line.c
+++ b/tests/tests-line.c
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <errno.h>
diff --git a/tests/tests-misc.c b/tests/tests-misc.c
index a98329f..051ab81 100644
--- a/tests/tests-misc.c
+++ b/tests/tests-misc.c
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <string.h>
diff --git a/tools/Makefile.am b/tools/Makefile.am
index bbfcab6..4a13266 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -1,4 +1,4 @@ 
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 AM_CFLAGS = -I$(top_srcdir)/include/ -include $(top_builddir)/config.h
diff --git a/tools/gpio-tools-test b/tools/gpio-tools-test
index 7d42374..b3d19f5 100755
--- a/tools/gpio-tools-test
+++ b/tools/gpio-tools-test
@@ -1,5 +1,5 @@ 
 #!/usr/bin/env bash
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 MIN_KERNEL_VERSION="5.5.0"
diff --git a/tools/gpio-tools-test.bats b/tools/gpio-tools-test.bats
index ba0a904..b35a36e 100755
--- a/tools/gpio-tools-test.bats
+++ b/tools/gpio-tools-test.bats
@@ -1,5 +1,5 @@ 
 #!/usr/bin/env bats
-# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 # Simple test harness for the gpio-tools.
diff --git a/tools/gpiodetect.c b/tools/gpiodetect.c
index 1780f40..7a2015e 100644
--- a/tools/gpiodetect.c
+++ b/tools/gpiodetect.c
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <dirent.h>
diff --git a/tools/gpiofind.c b/tools/gpiofind.c
index 45033d9..4936c4f 100644
--- a/tools/gpiofind.c
+++ b/tools/gpiofind.c
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <dirent.h>
diff --git a/tools/gpioget.c b/tools/gpioget.c
index 0d8e286..527dc22 100644
--- a/tools/gpioget.c
+++ b/tools/gpioget.c
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <getopt.h>
diff --git a/tools/gpioinfo.c b/tools/gpioinfo.c
index aba5bde..84588bc 100644
--- a/tools/gpioinfo.c
+++ b/tools/gpioinfo.c
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <dirent.h>
diff --git a/tools/gpiomon.c b/tools/gpiomon.c
index e9f2055..8bf2c70 100644
--- a/tools/gpiomon.c
+++ b/tools/gpiomon.c
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <errno.h>
diff --git a/tools/gpioset.c b/tools/gpioset.c
index b34efea..7e9d88f 100644
--- a/tools/gpioset.c
+++ b/tools/gpioset.c
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 #include <errno.h>
diff --git a/tools/tools-common.c b/tools/tools-common.c
index 98a4b9d..80087ee 100644
--- a/tools/tools-common.c
+++ b/tools/tools-common.c
@@ -1,4 +1,4 @@ 
-// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
 
 /* Common code for GPIO tools. */
diff --git a/tools/tools-common.h b/tools/tools-common.h
index 779dde5..5d5b505 100644
--- a/tools/tools-common.h
+++ b/tools/tools-common.h
@@ -1,4 +1,4 @@ 
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 /* SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com> */
 
 #ifndef __GPIOD_TOOLS_COMMON_H__