diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig
index 19e4e904c9bfcf5bb1ccdfba3faf2b60ced9e7e5..6241678e99aff0859fd7f9437624b331224f6ee0 100644
--- a/drivers/mux/Kconfig
+++ b/drivers/mux/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # Multiplexer devices
 #
diff --git a/drivers/mux/Makefile b/drivers/mux/Makefile
index 0e1e59760e3f36f9ba852993a76704cea68be6ae..c3d883955fd5de332ac5191493818f80c2891a3a 100644
--- a/drivers/mux/Makefile
+++ b/drivers/mux/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for multiplexer devices.
 #
diff --git a/drivers/mux/adg792a.c b/drivers/mux/adg792a.c
index 12aa221ab90d53ea108f05fa68efc34455ffc60b..6a8725cf3d717cce9539e950f6ad9124d57e6d34 100644
--- a/drivers/mux/adg792a.c
+++ b/drivers/mux/adg792a.c
@@ -1,13 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Multiplexer driver for Analog Devices ADG792A/G Triple 4:1 mux
  *
  * Copyright (C) 2017 Axentia Technologies AB
  *
  * Author: Peter Rosin <peda@axentia.se>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 
 #include <linux/err.h>
diff --git a/drivers/mux/core.c b/drivers/mux/core.c
index 2260063b0ea83be7f24e5d780af8bd808c23b427..959d22aaa063c592028d37c19c50129c3a03f343 100644
--- a/drivers/mux/core.c
+++ b/drivers/mux/core.c
@@ -1,13 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Multiplexer subsystem
  *
  * Copyright (C) 2017 Axentia Technologies AB
  *
  * Author: Peter Rosin <peda@axentia.se>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 
 #define pr_fmt(fmt) "mux-core: " fmt
diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index 468bf170960650c5374b478779e6c291d8335201..6fdd9316db8b9f96a6cb163c064862428d434b74 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -1,13 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * GPIO-controlled multiplexer driver
  *
  * Copyright (C) 2017 Axentia Technologies AB
  *
  * Author: Peter Rosin <peda@axentia.se>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 
 #include <linux/err.h>
diff --git a/drivers/mux/mmio.c b/drivers/mux/mmio.c
index 37c1de359a7055afa6179b49b4827a94fdeeb45d..935ac44aa209e9f8753299f01edbc6476cd7d827 100644
--- a/drivers/mux/mmio.c
+++ b/drivers/mux/mmio.c
@@ -1,11 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * MMIO register bitfield-controlled multiplexer driver
  *
  * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 
 #include <linux/bitops.h>
diff --git a/include/linux/mux/consumer.h b/include/linux/mux/consumer.h
index ea96d4c82be7db6c74be886005c3f1f86d96a612..5fc6bb2fefad96a739fc6502ae49330a3d4991dc 100644
--- a/include/linux/mux/consumer.h
+++ b/include/linux/mux/consumer.h
@@ -1,13 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * mux/consumer.h - definitions for the multiplexer consumer interface
  *
  * Copyright (C) 2017 Axentia Technologies AB
  *
  * Author: Peter Rosin <peda@axentia.se>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 
 #ifndef _LINUX_MUX_CONSUMER_H
diff --git a/include/linux/mux/driver.h b/include/linux/mux/driver.h
index 35c3579c3304434814a138c4810165c212c896d1..627a2c6bc02d7f407afe02c0edf956edc0eaebd2 100644
--- a/include/linux/mux/driver.h
+++ b/include/linux/mux/driver.h
@@ -1,13 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * mux/driver.h - definitions for the multiplexer driver interface
  *
  * Copyright (C) 2017 Axentia Technologies AB
  *
  * Author: Peter Rosin <peda@axentia.se>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 
 #ifndef _LINUX_MUX_DRIVER_H