License cleanup: add SPDX GPL-2.0 license identifier to files with no license

Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

80 files changed, 80 insertions, 0 deletions

diff --git a/arch/mips/boot/dts/Makefile b/arch/mips/boot/dts/Makefile
index cbac26ce063e..e0a4e939f843 100644
--- a/arch/mips/boot/dts/Makefile
+++ b/arch/mips/boot/dts/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 dts-dirs	+= brcm
 dts-dirs	+= cavium-octeon
 dts-dirs	+= img
diff --git a/arch/mips/boot/dts/brcm/Makefile b/arch/mips/boot/dts/brcm/Makefile
index d61bc2aebf69..9e09cc4556b3 100644
--- a/arch/mips/boot/dts/brcm/Makefile
+++ b/arch/mips/boot/dts/brcm/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_DT_BCM93384WVG)		+= bcm93384wvg.dtb
 dtb-$(CONFIG_DT_BCM93384WVG_VIPER)	+= bcm93384wvg_viper.dtb
 dtb-$(CONFIG_DT_BCM96368MVWG)		+= bcm96368mvwg.dtb
diff --git a/arch/mips/boot/dts/brcm/bcm3368-netgear-cvg834g.dts b/arch/mips/boot/dts/brcm/bcm3368-netgear-cvg834g.dts
index 2f2e80fdcde8..ed6023a91763 100644
--- a/arch/mips/boot/dts/brcm/bcm3368-netgear-cvg834g.dts
+++ b/arch/mips/boot/dts/brcm/bcm3368-netgear-cvg834g.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm3368.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm3368.dtsi b/arch/mips/boot/dts/brcm/bcm3368.dtsi
index bee855cb8073..277cde02b744 100644
--- a/arch/mips/boot/dts/brcm/bcm3368.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm3368.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm3384_viper.dtsi b/arch/mips/boot/dts/brcm/bcm3384_viper.dtsi
index aa406b43c65f..eb2a9c6ed604 100644
--- a/arch/mips/boot/dts/brcm/bcm3384_viper.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm3384_viper.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm3384_zephyr.dtsi b/arch/mips/boot/dts/brcm/bcm3384_zephyr.dtsi
index a7bd8564e9f6..d7ad769a42fc 100644
--- a/arch/mips/boot/dts/brcm/bcm3384_zephyr.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm3384_zephyr.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm63268-comtrend-vr-3032u.dts b/arch/mips/boot/dts/brcm/bcm63268-comtrend-vr-3032u.dts
index 430d35ca33d5..2bc0d8401ad6 100644
--- a/arch/mips/boot/dts/brcm/bcm63268-comtrend-vr-3032u.dts
+++ b/arch/mips/boot/dts/brcm/bcm63268-comtrend-vr-3032u.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm63268.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm63268.dtsi b/arch/mips/boot/dts/brcm/bcm63268.dtsi
index 7e6bf2cc0287..3b09f44e67fb 100644
--- a/arch/mips/boot/dts/brcm/bcm63268.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm63268.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm6328.dtsi b/arch/mips/boot/dts/brcm/bcm6328.dtsi
index 5633b9d90f55..644486fe4159 100644
--- a/arch/mips/boot/dts/brcm/bcm6328.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm6328.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm6358-neufbox4-sercomm.dts b/arch/mips/boot/dts/brcm/bcm6358-neufbox4-sercomm.dts
index 702eae2a22a0..5e62190aa3d5 100644
--- a/arch/mips/boot/dts/brcm/bcm6358-neufbox4-sercomm.dts
+++ b/arch/mips/boot/dts/brcm/bcm6358-neufbox4-sercomm.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm6358.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm6358.dtsi b/arch/mips/boot/dts/brcm/bcm6358.dtsi
index f9d8d392162b..682df7fb7069 100644
--- a/arch/mips/boot/dts/brcm/bcm6358.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm6358.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm6362-neufbox6-sercomm.dts b/arch/mips/boot/dts/brcm/bcm6362-neufbox6-sercomm.dts
index 480f2a5bf1da..3e83bee5b91e 100644
--- a/arch/mips/boot/dts/brcm/bcm6362-neufbox6-sercomm.dts
+++ b/arch/mips/boot/dts/brcm/bcm6362-neufbox6-sercomm.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm6362.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm6362.dtsi b/arch/mips/boot/dts/brcm/bcm6362.dtsi
index c507da594f2f..a82a5e5de672 100644
--- a/arch/mips/boot/dts/brcm/bcm6362.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm6362.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm6368.dtsi b/arch/mips/boot/dts/brcm/bcm6368.dtsi
index d0e3a70b32e2..7a72f59ae457 100644
--- a/arch/mips/boot/dts/brcm/bcm6368.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm6368.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm7125.dtsi b/arch/mips/boot/dts/brcm/bcm7125.dtsi
index 79f838ed96c5..2f9ef565e5d0 100644
--- a/arch/mips/boot/dts/brcm/bcm7125.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm7125.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm7346.dtsi b/arch/mips/boot/dts/brcm/bcm7346.dtsi
index da7bfa45a57d..02e426fe6013 100644
--- a/arch/mips/boot/dts/brcm/bcm7346.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm7346.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm7358.dtsi b/arch/mips/boot/dts/brcm/bcm7358.dtsi
index 9b05760453f0..1089d6ebc841 100644
--- a/arch/mips/boot/dts/brcm/bcm7358.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm7358.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm7360.dtsi b/arch/mips/boot/dts/brcm/bcm7360.dtsi
index 57b613c6acf2..4b87ebec407a 100644
--- a/arch/mips/boot/dts/brcm/bcm7360.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm7360.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm7362.dtsi b/arch/mips/boot/dts/brcm/bcm7362.dtsi
index c2a2843aaa9a..ca657df34b6d 100644
--- a/arch/mips/boot/dts/brcm/bcm7362.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm7362.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm7420.dtsi b/arch/mips/boot/dts/brcm/bcm7420.dtsi
index 532fc8a15796..d262e11bc3f9 100644
--- a/arch/mips/boot/dts/brcm/bcm7420.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm7420.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm7425.dtsi b/arch/mips/boot/dts/brcm/bcm7425.dtsi
index f56fb25f2e6b..e4fb9b6e6dce 100644
--- a/arch/mips/boot/dts/brcm/bcm7425.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm7425.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm7435.dtsi b/arch/mips/boot/dts/brcm/bcm7435.dtsi
index f2cead2eae5c..1484e8990e52 100644
--- a/arch/mips/boot/dts/brcm/bcm7435.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm7435.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/brcm/bcm93384wvg.dts b/arch/mips/boot/dts/brcm/bcm93384wvg.dts
index d1e44a17d41a..601e4d9293ab 100644
--- a/arch/mips/boot/dts/brcm/bcm93384wvg.dts
+++ b/arch/mips/boot/dts/brcm/bcm93384wvg.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm3384_zephyr.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm93384wvg_viper.dts b/arch/mips/boot/dts/brcm/bcm93384wvg_viper.dts
index 1ecb2696aca8..938a8e66128c 100644
--- a/arch/mips/boot/dts/brcm/bcm93384wvg_viper.dts
+++ b/arch/mips/boot/dts/brcm/bcm93384wvg_viper.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm3384_viper.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm96368mvwg.dts b/arch/mips/boot/dts/brcm/bcm96368mvwg.dts
index 8c71c6845730..6d772c394e41 100644
--- a/arch/mips/boot/dts/brcm/bcm96368mvwg.dts
+++ b/arch/mips/boot/dts/brcm/bcm96368mvwg.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm6368.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm97125cbmb.dts b/arch/mips/boot/dts/brcm/bcm97125cbmb.dts
index d72bc423ceaa..7f59ea2ded6c 100644
--- a/arch/mips/boot/dts/brcm/bcm97125cbmb.dts
+++ b/arch/mips/boot/dts/brcm/bcm97125cbmb.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm7125.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm97346dbsmb.dts b/arch/mips/boot/dts/brcm/bcm97346dbsmb.dts
index ea52d7b5772f..9e7d5228f2b7 100644
--- a/arch/mips/boot/dts/brcm/bcm97346dbsmb.dts
+++ b/arch/mips/boot/dts/brcm/bcm97346dbsmb.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm7346.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm97358svmb.dts b/arch/mips/boot/dts/brcm/bcm97358svmb.dts
index 71357fdc19af..708207a0002d 100644
--- a/arch/mips/boot/dts/brcm/bcm97358svmb.dts
+++ b/arch/mips/boot/dts/brcm/bcm97358svmb.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm7358.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm97360svmb.dts b/arch/mips/boot/dts/brcm/bcm97360svmb.dts
index e2fed406c6ee..73c6dc9c8c6d 100644
--- a/arch/mips/boot/dts/brcm/bcm97360svmb.dts
+++ b/arch/mips/boot/dts/brcm/bcm97360svmb.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm7360.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm97362svmb.dts b/arch/mips/boot/dts/brcm/bcm97362svmb.dts
index 78bffdf11872..37bacfdcf9d9 100644
--- a/arch/mips/boot/dts/brcm/bcm97362svmb.dts
+++ b/arch/mips/boot/dts/brcm/bcm97362svmb.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm7362.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm97420c.dts b/arch/mips/boot/dts/brcm/bcm97420c.dts
index d62b448a152d..f96241e94874 100644
--- a/arch/mips/boot/dts/brcm/bcm97420c.dts
+++ b/arch/mips/boot/dts/brcm/bcm97420c.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm7420.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm97425svmb.dts b/arch/mips/boot/dts/brcm/bcm97425svmb.dts
index 73aa006bd9ce..ce762c7b2e54 100644
--- a/arch/mips/boot/dts/brcm/bcm97425svmb.dts
+++ b/arch/mips/boot/dts/brcm/bcm97425svmb.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm7425.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm97435svmb.dts b/arch/mips/boot/dts/brcm/bcm97435svmb.dts
index 0a915f3feab6..d4dd31a543fd 100644
--- a/arch/mips/boot/dts/brcm/bcm97435svmb.dts
+++ b/arch/mips/boot/dts/brcm/bcm97435svmb.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm7435.dtsi"
diff --git a/arch/mips/boot/dts/brcm/bcm97xxx-nand-cs1-bch24.dtsi b/arch/mips/boot/dts/brcm/bcm97xxx-nand-cs1-bch24.dtsi
index 3c24f97de922..96c30d857be4 100644
--- a/arch/mips/boot/dts/brcm/bcm97xxx-nand-cs1-bch24.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm97xxx-nand-cs1-bch24.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 &nand {
 	nandcs@1 {
 		compatible = "brcm,nandcs";
diff --git a/arch/mips/boot/dts/brcm/bcm97xxx-nand-cs1-bch4.dtsi b/arch/mips/boot/dts/brcm/bcm97xxx-nand-cs1-bch4.dtsi
index cb531816ef4c..7b5afefbbfab 100644
--- a/arch/mips/boot/dts/brcm/bcm97xxx-nand-cs1-bch4.dtsi
+++ b/arch/mips/boot/dts/brcm/bcm97xxx-nand-cs1-bch4.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 &nand {
 	nandcs@1 {
 		compatible = "brcm,nandcs";
diff --git a/arch/mips/boot/dts/brcm/bcm9ejtagprb.dts b/arch/mips/boot/dts/brcm/bcm9ejtagprb.dts
index 1da4608680aa..8d58c1971b30 100644
--- a/arch/mips/boot/dts/brcm/bcm9ejtagprb.dts
+++ b/arch/mips/boot/dts/brcm/bcm9ejtagprb.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "bcm6328.dtsi"
diff --git a/arch/mips/boot/dts/cavium-octeon/Makefile b/arch/mips/boot/dts/cavium-octeon/Makefile
index 5b99c40a058f..35300e091573 100644
--- a/arch/mips/boot/dts/cavium-octeon/Makefile
+++ b/arch/mips/boot/dts/cavium-octeon/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_CAVIUM_OCTEON_SOC)	+= octeon_3xxx.dtb octeon_68xx.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
diff --git a/arch/mips/boot/dts/cavium-octeon/octeon_3xxx.dts b/arch/mips/boot/dts/cavium-octeon/octeon_3xxx.dts
index ca6b4467bcd3..0fa3dd1819ff 100644
--- a/arch/mips/boot/dts/cavium-octeon/octeon_3xxx.dts
+++ b/arch/mips/boot/dts/cavium-octeon/octeon_3xxx.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * OCTEON 3XXX, 5XXX, 63XX device tree skeleton.
  *
diff --git a/arch/mips/boot/dts/cavium-octeon/octeon_3xxx.dtsi b/arch/mips/boot/dts/cavium-octeon/octeon_3xxx.dtsi
index 5302148e05a3..3c296623d870 100644
--- a/arch/mips/boot/dts/cavium-octeon/octeon_3xxx.dtsi
+++ b/arch/mips/boot/dts/cavium-octeon/octeon_3xxx.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* OCTEON 3XXX DTS common parts. */
 
 /dts-v1/;
diff --git a/arch/mips/boot/dts/cavium-octeon/octeon_68xx.dts b/arch/mips/boot/dts/cavium-octeon/octeon_68xx.dts
index 79b46fcb0a11..3d0acbb2e15f 100644
--- a/arch/mips/boot/dts/cavium-octeon/octeon_68xx.dts
+++ b/arch/mips/boot/dts/cavium-octeon/octeon_68xx.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 /*
  * OCTEON 68XX device tree skeleton.
diff --git a/arch/mips/boot/dts/img/Makefile b/arch/mips/boot/dts/img/Makefile
index 3d70958d0f5a..139bcd887b86 100644
--- a/arch/mips/boot/dts/img/Makefile
+++ b/arch/mips/boot/dts/img/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_FIT_IMAGE_FDT_BOSTON)	+= boston.dtb
 
 dtb-$(CONFIG_MACH_PISTACHIO)	+= pistachio_marduk.dtb
diff --git a/arch/mips/boot/dts/img/boston.dts b/arch/mips/boot/dts/img/boston.dts
index 53bfa29a7093..2cd49b60e030 100644
--- a/arch/mips/boot/dts/img/boston.dts
+++ b/arch/mips/boot/dts/img/boston.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 #include <dt-bindings/clock/boston-clock.h>
diff --git a/arch/mips/boot/dts/ingenic/Makefile b/arch/mips/boot/dts/ingenic/Makefile
index f2b864f07850..7798262570da 100644
--- a/arch/mips/boot/dts/ingenic/Makefile
+++ b/arch/mips/boot/dts/ingenic/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_JZ4740_QI_LB60)	+= qi_lb60.dtb
 dtb-$(CONFIG_JZ4780_CI20)	+= ci20.dtb
 
diff --git a/arch/mips/boot/dts/ingenic/ci20.dts b/arch/mips/boot/dts/ingenic/ci20.dts
index 6c381844929c..a4cc52214dbd 100644
--- a/arch/mips/boot/dts/ingenic/ci20.dts
+++ b/arch/mips/boot/dts/ingenic/ci20.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 #include "jz4780.dtsi"
diff --git a/arch/mips/boot/dts/ingenic/jz4740.dtsi b/arch/mips/boot/dts/ingenic/jz4740.dtsi
index 2ca7ce7481f1..cd5185bb90ae 100644
--- a/arch/mips/boot/dts/ingenic/jz4740.dtsi
+++ b/arch/mips/boot/dts/ingenic/jz4740.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <dt-bindings/clock/jz4740-cgu.h>
 
 / {
diff --git a/arch/mips/boot/dts/ingenic/jz4780.dtsi b/arch/mips/boot/dts/ingenic/jz4780.dtsi
index e906134ecaef..ff3298f29ec4 100644
--- a/arch/mips/boot/dts/ingenic/jz4780.dtsi
+++ b/arch/mips/boot/dts/ingenic/jz4780.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <dt-bindings/clock/jz4780-cgu.h>
 
 / {
diff --git a/arch/mips/boot/dts/ingenic/qi_lb60.dts b/arch/mips/boot/dts/ingenic/qi_lb60.dts
index b715ee2ac2ee..76aaf8982554 100644
--- a/arch/mips/boot/dts/ingenic/qi_lb60.dts
+++ b/arch/mips/boot/dts/ingenic/qi_lb60.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 #include "jz4740.dtsi"
diff --git a/arch/mips/boot/dts/lantiq/Makefile b/arch/mips/boot/dts/lantiq/Makefile
index 0906c62141b9..0c50e3246a63 100644
--- a/arch/mips/boot/dts/lantiq/Makefile
+++ b/arch/mips/boot/dts/lantiq/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_DT_EASY50712)	+= easy50712.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
diff --git a/arch/mips/boot/dts/lantiq/danube.dtsi b/arch/mips/boot/dts/lantiq/danube.dtsi
index d4c59e003708..2dd950181f8a 100644
--- a/arch/mips/boot/dts/lantiq/danube.dtsi
+++ b/arch/mips/boot/dts/lantiq/danube.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/lantiq/easy50712.dts b/arch/mips/boot/dts/lantiq/easy50712.dts
index b59962585dde..c37a33962f28 100644
--- a/arch/mips/boot/dts/lantiq/easy50712.dts
+++ b/arch/mips/boot/dts/lantiq/easy50712.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "danube.dtsi"
diff --git a/arch/mips/boot/dts/mti/Makefile b/arch/mips/boot/dts/mti/Makefile
index fcabd69b7030..5ee06f73c348 100644
--- a/arch/mips/boot/dts/mti/Makefile
+++ b/arch/mips/boot/dts/mti/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_MIPS_MALTA)	+= malta.dtb
 dtb-$(CONFIG_LEGACY_BOARD_SEAD3)	+= sead3.dtb
 
diff --git a/arch/mips/boot/dts/mti/malta.dts b/arch/mips/boot/dts/mti/malta.dts
index ffe3a1508e72..9944e716eac8 100644
--- a/arch/mips/boot/dts/mti/malta.dts
+++ b/arch/mips/boot/dts/mti/malta.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 #include <dt-bindings/interrupt-controller/irq.h>
diff --git a/arch/mips/boot/dts/mti/sead3.dts b/arch/mips/boot/dts/mti/sead3.dts
index 4f8bc83c2960..192c26ff1d3d 100644
--- a/arch/mips/boot/dts/mti/sead3.dts
+++ b/arch/mips/boot/dts/mti/sead3.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /memreserve/ 0x00000000 0x00001000;	// reserved
diff --git a/arch/mips/boot/dts/netlogic/Makefile b/arch/mips/boot/dts/netlogic/Makefile
index 9868057140b5..1cb2fdbd8949 100644
--- a/arch/mips/boot/dts/netlogic/Makefile
+++ b/arch/mips/boot/dts/netlogic/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_DT_XLP_EVP)	+= xlp_evp.dtb
 dtb-$(CONFIG_DT_XLP_SVP)	+= xlp_svp.dtb
 dtb-$(CONFIG_DT_XLP_FVP)	+= xlp_fvp.dtb
diff --git a/arch/mips/boot/dts/netlogic/xlp_evp.dts b/arch/mips/boot/dts/netlogic/xlp_evp.dts
index ec16ec2d8d02..e63e55926e04 100644
--- a/arch/mips/boot/dts/netlogic/xlp_evp.dts
+++ b/arch/mips/boot/dts/netlogic/xlp_evp.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * XLP8XX Device Tree Source for EVP boards
  */
diff --git a/arch/mips/boot/dts/netlogic/xlp_fvp.dts b/arch/mips/boot/dts/netlogic/xlp_fvp.dts
index 4bcebe641d8e..d05abf13fb7d 100644
--- a/arch/mips/boot/dts/netlogic/xlp_fvp.dts
+++ b/arch/mips/boot/dts/netlogic/xlp_fvp.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * XLP2XX Device Tree Source for FVP boards
  */
diff --git a/arch/mips/boot/dts/netlogic/xlp_gvp.dts b/arch/mips/boot/dts/netlogic/xlp_gvp.dts
index b3ccb82ad7e4..d47de4851786 100644
--- a/arch/mips/boot/dts/netlogic/xlp_gvp.dts
+++ b/arch/mips/boot/dts/netlogic/xlp_gvp.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * XLP9XX Device Tree Source for GVP boards
  */
diff --git a/arch/mips/boot/dts/netlogic/xlp_rvp.dts b/arch/mips/boot/dts/netlogic/xlp_rvp.dts
index 3783639a318a..aa0faee194ec 100644
--- a/arch/mips/boot/dts/netlogic/xlp_rvp.dts
+++ b/arch/mips/boot/dts/netlogic/xlp_rvp.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * XLP5XX Device Tree Source for RVP boards
  */
diff --git a/arch/mips/boot/dts/netlogic/xlp_svp.dts b/arch/mips/boot/dts/netlogic/xlp_svp.dts
index 44d6640c1441..3bb0b2e08e4a 100644
--- a/arch/mips/boot/dts/netlogic/xlp_svp.dts
+++ b/arch/mips/boot/dts/netlogic/xlp_svp.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * XLP3XX Device Tree Source for SVP boards
  */
diff --git a/arch/mips/boot/dts/pic32/Makefile b/arch/mips/boot/dts/pic32/Makefile
index 7ac790551ec9..a86ddd289cfd 100644
--- a/arch/mips/boot/dts/pic32/Makefile
+++ b/arch/mips/boot/dts/pic32/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_DTB_PIC32_MZDA_SK)		+= pic32mzda_sk.dtb
 
 dtb-$(CONFIG_DTB_PIC32_NONE)		+= \
diff --git a/arch/mips/boot/dts/qca/Makefile b/arch/mips/boot/dts/qca/Makefile
index 63a9ddf048c9..eabd94eb59db 100644
--- a/arch/mips/boot/dts/qca/Makefile
+++ b/arch/mips/boot/dts/qca/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # All DTBs
 dtb-$(CONFIG_ATH79)			+= ar9132_tl_wr1043nd_v1.dtb
 dtb-$(CONFIG_ATH79)			+= ar9331_dpt_module.dtb
diff --git a/arch/mips/boot/dts/qca/ar9132.dtsi b/arch/mips/boot/dts/qca/ar9132.dtsi
index 302f0a8d2988..1fe561c5f90e 100644
--- a/arch/mips/boot/dts/qca/ar9132.dtsi
+++ b/arch/mips/boot/dts/qca/ar9132.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <dt-bindings/clock/ath79-clk.h>
 
 / {
diff --git a/arch/mips/boot/dts/qca/ar9132_tl_wr1043nd_v1.dts b/arch/mips/boot/dts/qca/ar9132_tl_wr1043nd_v1.dts
index 3c3b7ce5737b..3931033e47c8 100644
--- a/arch/mips/boot/dts/qca/ar9132_tl_wr1043nd_v1.dts
+++ b/arch/mips/boot/dts/qca/ar9132_tl_wr1043nd_v1.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 #include <dt-bindings/gpio/gpio.h>
diff --git a/arch/mips/boot/dts/qca/ar9331.dtsi b/arch/mips/boot/dts/qca/ar9331.dtsi
index cf47ed4d8569..efd5f0722206 100644
--- a/arch/mips/boot/dts/qca/ar9331.dtsi
+++ b/arch/mips/boot/dts/qca/ar9331.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <dt-bindings/clock/ath79-clk.h>
 
 / {
diff --git a/arch/mips/boot/dts/qca/ar9331_dpt_module.dts b/arch/mips/boot/dts/qca/ar9331_dpt_module.dts
index 98e74500e79d..d4e4502daaa8 100644
--- a/arch/mips/boot/dts/qca/ar9331_dpt_module.dts
+++ b/arch/mips/boot/dts/qca/ar9331_dpt_module.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 #include <dt-bindings/gpio/gpio.h>
diff --git a/arch/mips/boot/dts/qca/ar9331_dragino_ms14.dts b/arch/mips/boot/dts/qca/ar9331_dragino_ms14.dts
index 56f832076a69..4f95ccf17c4c 100644
--- a/arch/mips/boot/dts/qca/ar9331_dragino_ms14.dts
+++ b/arch/mips/boot/dts/qca/ar9331_dragino_ms14.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 #include <dt-bindings/gpio/gpio.h>
diff --git a/arch/mips/boot/dts/qca/ar9331_omega.dts b/arch/mips/boot/dts/qca/ar9331_omega.dts
index b2be3b04479d..f70f79c4d0d5 100644
--- a/arch/mips/boot/dts/qca/ar9331_omega.dts
+++ b/arch/mips/boot/dts/qca/ar9331_omega.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 #include <dt-bindings/gpio/gpio.h>
diff --git a/arch/mips/boot/dts/qca/ar9331_tl_mr3020.dts b/arch/mips/boot/dts/qca/ar9331_tl_mr3020.dts
index 919cf3b854a5..748131aea22e 100644
--- a/arch/mips/boot/dts/qca/ar9331_tl_mr3020.dts
+++ b/arch/mips/boot/dts/qca/ar9331_tl_mr3020.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 #include <dt-bindings/gpio/gpio.h>
diff --git a/arch/mips/boot/dts/ralink/Makefile b/arch/mips/boot/dts/ralink/Makefile
index 55e2937b61f3..a80eeeecf613 100644
--- a/arch/mips/boot/dts/ralink/Makefile
+++ b/arch/mips/boot/dts/ralink/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_DTB_RT2880_EVAL)	+= rt2880_eval.dtb
 dtb-$(CONFIG_DTB_RT305X_EVAL)	+= rt3052_eval.dtb
 dtb-$(CONFIG_DTB_RT3883_EVAL)	+= rt3883_eval.dtb
diff --git a/arch/mips/boot/dts/ralink/mt7620a.dtsi b/arch/mips/boot/dts/ralink/mt7620a.dtsi
index 793c0c7ca921..1f6e5320f486 100644
--- a/arch/mips/boot/dts/ralink/mt7620a.dtsi
+++ b/arch/mips/boot/dts/ralink/mt7620a.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/ralink/mt7620a_eval.dts b/arch/mips/boot/dts/ralink/mt7620a_eval.dts
index 709f58132f5c..8de8f89f31b8 100644
--- a/arch/mips/boot/dts/ralink/mt7620a_eval.dts
+++ b/arch/mips/boot/dts/ralink/mt7620a_eval.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "mt7620a.dtsi"
diff --git a/arch/mips/boot/dts/ralink/rt2880.dtsi b/arch/mips/boot/dts/ralink/rt2880.dtsi
index fb2faef0ab79..8fc1987d9063 100644
--- a/arch/mips/boot/dts/ralink/rt2880.dtsi
+++ b/arch/mips/boot/dts/ralink/rt2880.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/ralink/rt2880_eval.dts b/arch/mips/boot/dts/ralink/rt2880_eval.dts
index 0a685db093d4..759bc1dd5b83 100644
--- a/arch/mips/boot/dts/ralink/rt2880_eval.dts
+++ b/arch/mips/boot/dts/ralink/rt2880_eval.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "rt2880.dtsi"
diff --git a/arch/mips/boot/dts/ralink/rt3050.dtsi b/arch/mips/boot/dts/ralink/rt3050.dtsi
index d3cb57f985da..23062333a76d 100644
--- a/arch/mips/boot/dts/ralink/rt3050.dtsi
+++ b/arch/mips/boot/dts/ralink/rt3050.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/ralink/rt3052_eval.dts b/arch/mips/boot/dts/ralink/rt3052_eval.dts
index ec9e9a035541..674efdd42e74 100644
--- a/arch/mips/boot/dts/ralink/rt3052_eval.dts
+++ b/arch/mips/boot/dts/ralink/rt3052_eval.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 #include "rt3050.dtsi"
diff --git a/arch/mips/boot/dts/ralink/rt3883.dtsi b/arch/mips/boot/dts/ralink/rt3883.dtsi
index 3d6fc9afdaf6..61132cf157e5 100644
--- a/arch/mips/boot/dts/ralink/rt3883.dtsi
+++ b/arch/mips/boot/dts/ralink/rt3883.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/ralink/rt3883_eval.dts b/arch/mips/boot/dts/ralink/rt3883_eval.dts
index e8df21a5d10d..c22bc84df219 100644
--- a/arch/mips/boot/dts/ralink/rt3883_eval.dts
+++ b/arch/mips/boot/dts/ralink/rt3883_eval.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 /include/ "rt3883.dtsi"
diff --git a/arch/mips/boot/dts/xilfpga/Makefile b/arch/mips/boot/dts/xilfpga/Makefile
index 913a752a9ff1..498ac081e2fe 100644
--- a/arch/mips/boot/dts/xilfpga/Makefile
+++ b/arch/mips/boot/dts/xilfpga/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_XILFPGA_NEXYS4DDR)	+= nexys4ddr.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
diff --git a/arch/mips/boot/dts/xilfpga/microAptiv.dtsi b/arch/mips/boot/dts/xilfpga/microAptiv.dtsi
index 81d518e75785..87b2b1f9a1b0 100644
--- a/arch/mips/boot/dts/xilfpga/microAptiv.dtsi
+++ b/arch/mips/boot/dts/xilfpga/microAptiv.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;
diff --git a/arch/mips/boot/dts/xilfpga/nexys4ddr.dts b/arch/mips/boot/dts/xilfpga/nexys4ddr.dts
index 09a62f2e2f8f..41fee03dc312 100644
--- a/arch/mips/boot/dts/xilfpga/nexys4ddr.dts
+++ b/arch/mips/boot/dts/xilfpga/nexys4ddr.dts
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
 #include "microAptiv.dtsi"