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>

49 files changed, 49 insertions, 0 deletions

diff --git a/sound/soc/Makefile b/sound/soc/Makefile
index 39c27a5..bf8c1e2 100644
--- a/sound/soc/Makefile
+++ b/sound/soc/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 snd-soc-core-objs := soc-core.o soc-dapm.o soc-jack.o soc-cache.o soc-utils.o
 snd-soc-core-objs += soc-pcm.o soc-io.o soc-devres.o soc-ops.o
 snd-soc-core-$(CONFIG_SND_SOC_COMPRESS) += soc-compress.o
diff --git a/sound/soc/amd/acp.h b/sound/soc/amd/acp.h
index 330832e..9d33821 100644
--- a/sound/soc/amd/acp.h
+++ b/sound/soc/amd/acp.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __ACP_HW_H
 #define __ACP_HW_H
 
diff --git a/sound/soc/atmel/Makefile b/sound/soc/atmel/Makefile
index 67e10cb..4440646 100644
--- a/sound/soc/atmel/Makefile
+++ b/sound/soc/atmel/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # AT91 Platform Support
 snd-soc-atmel-pcm-pdc-objs := atmel-pcm-pdc.o
 snd-soc-atmel-pcm-dma-objs := atmel-pcm-dma.o
diff --git a/sound/soc/atmel/atmel-classd.h b/sound/soc/atmel/atmel-classd.h
index 73f8fdd..0f2e25a 100644
--- a/sound/soc/atmel/atmel-classd.h
+++ b/sound/soc/atmel/atmel-classd.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __ATMEL_CLASSD_H_
 #define __ATMEL_CLASSD_H_
 
diff --git a/sound/soc/atmel/atmel-pdmic.h b/sound/soc/atmel/atmel-pdmic.h
index 4527ac7..1dd3518 100644
--- a/sound/soc/atmel/atmel-pdmic.h
+++ b/sound/soc/atmel/atmel-pdmic.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __ATMEL_PDMIC_H_
 #define __ATMEL_PDMIC_H_
 
diff --git a/sound/soc/au1x/Makefile b/sound/soc/au1x/Makefile
index 9207105..33183d7 100644
--- a/sound/soc/au1x/Makefile
+++ b/sound/soc/au1x/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # Au1200/Au1550 PSC audio
 snd-soc-au1xpsc-dbdma-objs := dbdma2.o
 snd-soc-au1xpsc-i2s-objs := psc-i2s.o
diff --git a/sound/soc/blackfin/Makefile b/sound/soc/blackfin/Makefile
index f21e948..ebeb6a9 100644
--- a/sound/soc/blackfin/Makefile
+++ b/sound/soc/blackfin/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # Blackfin Platform Support
 snd-bf5xx-ac97-objs := bf5xx-ac97-pcm.o
 snd-bf5xx-i2s-objs := bf5xx-i2s-pcm.o
diff --git a/sound/soc/cirrus/Makefile b/sound/soc/cirrus/Makefile
index 5514146..bfb8dc4 100644
--- a/sound/soc/cirrus/Makefile
+++ b/sound/soc/cirrus/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # EP93xx Platform Support
 snd-soc-ep93xx-objs				:= ep93xx-pcm.o
 snd-soc-ep93xx-i2s-objs	 			:= ep93xx-i2s.o
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 77c1818..05018b7 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 snd-soc-88pm860x-objs := 88pm860x-codec.o
 snd-soc-ab8500-codec-objs := ab8500-codec.o
 snd-soc-ac97-objs := ac97.o
diff --git a/sound/soc/codecs/adau-utils.h b/sound/soc/codecs/adau-utils.h
index 939b5f3..bf5947b 100644
--- a/sound/soc/codecs/adau-utils.h
+++ b/sound/soc/codecs/adau-utils.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef SOUND_SOC_CODECS_ADAU_PLL_H
 #define SOUND_SOC_CODECS_ADAU_PLL_H
 
diff --git a/sound/soc/codecs/adau1373.h b/sound/soc/codecs/adau1373.h
index c6ab553..56320d5 100644
--- a/sound/soc/codecs/adau1373.h
+++ b/sound/soc/codecs/adau1373.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __ADAU1373_H__
 #define __ADAU1373_H__
 
diff --git a/sound/soc/codecs/adau17x1.h b/sound/soc/codecs/adau17x1.h
index bf04b7ef..ebae545 100644
--- a/sound/soc/codecs/adau17x1.h
+++ b/sound/soc/codecs/adau17x1.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __ADAU17X1_H__
 #define __ADAU17X1_H__
 
diff --git a/sound/soc/codecs/cs4271.h b/sound/soc/codecs/cs4271.h
index 9adad8e..290283a 100644
--- a/sound/soc/codecs/cs4271.h
+++ b/sound/soc/codecs/cs4271.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _CS4271_PRIV_H
 #define _CS4271_PRIV_H
 
diff --git a/sound/soc/codecs/es8328.h b/sound/soc/codecs/es8328.h
index 8930322..9109f6b 100644
--- a/sound/soc/codecs/es8328.h
+++ b/sound/soc/codecs/es8328.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * es8328.h  --  ES8328 ALSA SoC Audio driver
  */
diff --git a/sound/soc/codecs/hdac_hdmi.h b/sound/soc/codecs/hdac_hdmi.h
index dfc3a9c..b5b57a5 100644
--- a/sound/soc/codecs/hdac_hdmi.h
+++ b/sound/soc/codecs/hdac_hdmi.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __HDAC_HDMI_H__
 #define __HDAC_HDMI_H__
 
diff --git a/sound/soc/codecs/inno_rk3036.h b/sound/soc/codecs/inno_rk3036.h
index da759c6..44bb240 100644
--- a/sound/soc/codecs/inno_rk3036.h
+++ b/sound/soc/codecs/inno_rk3036.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Driver of Inno Codec for rk3036 by Rockchip Inc.
  *
diff --git a/sound/soc/codecs/rt5631.h b/sound/soc/codecs/rt5631.h
index 1340158..8a6b99a 100644
--- a/sound/soc/codecs/rt5631.h
+++ b/sound/soc/codecs/rt5631.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __RTCODEC5631_H__
 #define __RTCODEC5631_H__
 
diff --git a/sound/soc/codecs/tlv320aic26.h b/sound/soc/codecs/tlv320aic26.h
index 629b85e..1f2879b 100644
--- a/sound/soc/codecs/tlv320aic26.h
+++ b/sound/soc/codecs/tlv320aic26.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Texas Instruments TLV320AIC26 low power audio CODEC
  * register definitions
diff --git a/sound/soc/codecs/uda134x.h b/sound/soc/codecs/uda134x.h
index e41ab38..664618c 100644
--- a/sound/soc/codecs/uda134x.h
+++ b/sound/soc/codecs/uda134x.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _UDA134X_CODEC_H
 #define _UDA134X_CODEC_H
 
diff --git a/sound/soc/codecs/wm8993.h b/sound/soc/codecs/wm8993.h
index 4478b40..91811aa 100644
--- a/sound/soc/codecs/wm8993.h
+++ b/sound/soc/codecs/wm8993.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef WM8993_H
 #define WM8993_H
 
diff --git a/sound/soc/codecs/wm9713.h b/sound/soc/codecs/wm9713.h
index 7ecffc5..f0800dc 100644
--- a/sound/soc/codecs/wm9713.h
+++ b/sound/soc/codecs/wm9713.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * wm9713.h  --  WM9713 Soc Audio driver
  */
diff --git a/sound/soc/davinci/Makefile b/sound/soc/davinci/Makefile
index f883933..23c6592 100644
--- a/sound/soc/davinci/Makefile
+++ b/sound/soc/davinci/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # DAVINCI Platform Support
 snd-soc-edma-objs := edma-pcm.o
 snd-soc-davinci-i2s-objs := davinci-i2s.o
diff --git a/sound/soc/fsl/Makefile b/sound/soc/fsl/Makefile
index d28dc25..c67bf11 100644
--- a/sound/soc/fsl/Makefile
+++ b/sound/soc/fsl/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # MPC8610 HPCD Machine Support
 snd-soc-mpc8610-hpcd-objs := mpc8610_hpcd.o
 obj-$(CONFIG_SND_SOC_MPC8610_HPCD) += snd-soc-mpc8610-hpcd.o
diff --git a/sound/soc/fsl/imx-audmux.h b/sound/soc/fsl/imx-audmux.h
index 38a4209..f75b4d3 100644
--- a/sound/soc/fsl/imx-audmux.h
+++ b/sound/soc/fsl/imx-audmux.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __IMX_AUDMUX_H
 #define __IMX_AUDMUX_H
 
diff --git a/sound/soc/fsl/mpc5200_dma.h b/sound/soc/fsl/mpc5200_dma.h
index dff253f..d7ee33b 100644
--- a/sound/soc/fsl/mpc5200_dma.h
+++ b/sound/soc/fsl/mpc5200_dma.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Freescale MPC5200 Audio DMA driver
  */
diff --git a/sound/soc/generic/Makefile b/sound/soc/generic/Makefile
index 9e00052..9dec293 100644
--- a/sound/soc/generic/Makefile
+++ b/sound/soc/generic/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 snd-soc-simple-card-utils-objs	:= simple-card-utils.o
 snd-soc-simple-card-objs	:= simple-card.o
 snd-soc-simple-scu-card-objs	:= simple-scu-card.o
diff --git a/sound/soc/img/Makefile b/sound/soc/img/Makefile
index 0508c1c..3e7b0fd 100644
--- a/sound/soc/img/Makefile
+++ b/sound/soc/img/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_SND_SOC_IMG_I2S_IN) += img-i2s-in.o
 obj-$(CONFIG_SND_SOC_IMG_I2S_OUT) += img-i2s-out.o
 obj-$(CONFIG_SND_SOC_IMG_PARALLEL_OUT) += img-parallel-out.o
diff --git a/sound/soc/intel/Makefile b/sound/soc/intel/Makefile
index cdd495f..62f37ff 100644
--- a/sound/soc/intel/Makefile
+++ b/sound/soc/intel/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # Core support
 obj-$(CONFIG_SND_SOC_INTEL_SST) += common/
 
diff --git a/sound/soc/intel/atom/Makefile b/sound/soc/intel/atom/Makefile
index aa6548c..1dc6047 100644
--- a/sound/soc/intel/atom/Makefile
+++ b/sound/soc/intel/atom/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 snd-soc-sst-atom-hifi2-platform-objs :=	sst-mfld-platform-pcm.o \
 					sst-mfld-platform-compress.o \
 					sst-atom-controls.o
diff --git a/sound/soc/intel/atom/sst/Makefile b/sound/soc/intel/atom/sst/Makefile
index fd21726..795d1cf 100644
--- a/sound/soc/intel/atom/sst/Makefile
+++ b/sound/soc/intel/atom/sst/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 snd-intel-sst-core-objs := sst.o sst_ipc.o sst_stream.o sst_drv_interface.o sst_loader.o sst_pvt.o
 snd-intel-sst-pci-objs += sst_pci.o
 snd-intel-sst-acpi-objs += sst_acpi.o
diff --git a/sound/soc/intel/boards/Makefile b/sound/soc/intel/boards/Makefile
index a5c5bc5..69d2dfa 100644
--- a/sound/soc/intel/boards/Makefile
+++ b/sound/soc/intel/boards/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 snd-soc-sst-haswell-objs := haswell.o
 snd-soc-sst-byt-rt5640-mach-objs := byt-rt5640.o
 snd-soc-sst-byt-max98090-mach-objs := byt-max98090.o
diff --git a/sound/soc/intel/common/Makefile b/sound/soc/intel/common/Makefile
index 1a35149..0e029f3 100644
--- a/sound/soc/intel/common/Makefile
+++ b/sound/soc/intel/common/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 snd-soc-sst-dsp-objs := sst-dsp.o
 snd-soc-sst-acpi-objs := sst-acpi.o
 snd-soc-sst-match-objs := sst-match-acpi.o
diff --git a/sound/soc/intel/skylake/Makefile b/sound/soc/intel/skylake/Makefile
index 3380deb..d1ccbec 100644
--- a/sound/soc/intel/skylake/Makefile
+++ b/sound/soc/intel/skylake/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 snd-soc-skl-objs := skl.o skl-pcm.o skl-nhlt.o skl-messages.o \
 skl-topology.o
 
diff --git a/sound/soc/mediatek/mt8173/Makefile b/sound/soc/mediatek/mt8173/Makefile
index 0357b27..c1eed0d 100644
--- a/sound/soc/mediatek/mt8173/Makefile
+++ b/sound/soc/mediatek/mt8173/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # MTK Platform Support
 obj-$(CONFIG_SND_SOC_MT8173) += mt8173-afe-pcm.o
 # Machine support
diff --git a/sound/soc/mxs/Makefile b/sound/soc/mxs/Makefile
index 565b5b5..ab0a9a5 100644
--- a/sound/soc/mxs/Makefile
+++ b/sound/soc/mxs/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # MXS Platform Support
 snd-soc-mxs-objs := mxs-saif.o
 snd-soc-mxs-pcm-objs := mxs-pcm.o
diff --git a/sound/soc/nuc900/Makefile b/sound/soc/nuc900/Makefile
index 7e46c71..c7ba2b9 100644
--- a/sound/soc/nuc900/Makefile
+++ b/sound/soc/nuc900/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # NUC900 series audio
 snd-soc-nuc900-pcm-objs := nuc900-pcm.o
 snd-soc-nuc900-ac97-objs := nuc900-ac97.o
diff --git a/sound/soc/omap/Makefile b/sound/soc/omap/Makefile
index db36fbd..a6785dc 100644
--- a/sound/soc/omap/Makefile
+++ b/sound/soc/omap/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # OMAP Platform Support
 snd-soc-omap-objs := omap-pcm.o
 snd-soc-omap-dmic-objs := omap-dmic.o
diff --git a/sound/soc/pxa/Makefile b/sound/soc/pxa/Makefile
index 2cff67b..5b26566 100644
--- a/sound/soc/pxa/Makefile
+++ b/sound/soc/pxa/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # PXA Platform Support
 snd-soc-pxa2xx-objs := pxa2xx-pcm.o
 snd-soc-pxa2xx-ac97-objs := pxa2xx-ac97.o
diff --git a/sound/soc/qcom/Makefile b/sound/soc/qcom/Makefile
index 79e5c50..d528035 100644
--- a/sound/soc/qcom/Makefile
+++ b/sound/soc/qcom/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # Platform
 snd-soc-lpass-cpu-objs := lpass-cpu.o
 snd-soc-lpass-platform-objs := lpass-platform.o
diff --git a/sound/soc/rockchip/Makefile b/sound/soc/rockchip/Makefile
index 105f0e1..05b078e 100644
--- a/sound/soc/rockchip/Makefile
+++ b/sound/soc/rockchip/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # ROCKCHIP Platform Support
 snd-soc-rockchip-i2s-objs := rockchip_i2s.o
 snd-soc-rockchip-pdm-objs := rockchip_pdm.o
diff --git a/sound/soc/samsung/Makefile b/sound/soc/samsung/Makefile
index b6c2ee3..030949e 100644
--- a/sound/soc/samsung/Makefile
+++ b/sound/soc/samsung/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # S3c24XX Platform Support
 snd-soc-s3c-dma-objs := dmaengine.o
 snd-soc-idma-objs := idma.o
diff --git a/sound/soc/sh/Makefile b/sound/soc/sh/Makefile
index aaf3dcd..51bd7c8 100644
--- a/sound/soc/sh/Makefile
+++ b/sound/soc/sh/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 ## DMA engines
 snd-soc-dma-sh7760-objs	:= dma-sh7760.o
 obj-$(CONFIG_SND_SOC_PCM_SH7760)	+= snd-soc-dma-sh7760.o
diff --git a/sound/soc/sirf/Makefile b/sound/soc/sirf/Makefile
index dd917f2..16ed119 100644
--- a/sound/soc/sirf/Makefile
+++ b/sound/soc/sirf/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 snd-soc-sirf-audio-objs := sirf-audio.o
 snd-soc-sirf-audio-port-objs := sirf-audio-port.o
 snd-soc-sirf-usp-objs := sirf-usp.o
diff --git a/sound/soc/spear/Makefile b/sound/soc/spear/Makefile
index c4ea716..31d9dae 100644
--- a/sound/soc/spear/Makefile
+++ b/sound/soc/spear/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # SPEAR Platform Support
 snd-soc-spear-pcm-objs := spear_pcm.o
 snd-soc-spear-spdif-in-objs := spdif_in.o
diff --git a/sound/soc/stm/Makefile b/sound/soc/stm/Makefile
index 4ed22e6..5b7f0fa 100644
--- a/sound/soc/stm/Makefile
+++ b/sound/soc/stm/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # SAI
 snd-soc-stm32-sai-sub-objs := stm32_sai_sub.o
 obj-$(CONFIG_SND_SOC_STM32_SAI) += snd-soc-stm32-sai-sub.o
diff --git a/sound/soc/sunxi/Makefile b/sound/soc/sunxi/Makefile
index 1f1af62..4a9ef67 100644
--- a/sound/soc/sunxi/Makefile
+++ b/sound/soc/sunxi/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_SND_SUN4I_CODEC) += sun4i-codec.o
 obj-$(CONFIG_SND_SUN4I_I2S) += sun4i-i2s.o
 obj-$(CONFIG_SND_SUN4I_SPDIF) += sun4i-spdif.o
diff --git a/sound/soc/tegra/Makefile b/sound/soc/tegra/Makefile
index f214a3f..2329b72 100644
--- a/sound/soc/tegra/Makefile
+++ b/sound/soc/tegra/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # Tegra platform Support
 snd-soc-tegra-pcm-objs := tegra_pcm.o
 snd-soc-tegra-utils-objs += tegra_asoc_utils.o
diff --git a/sound/soc/txx9/Makefile b/sound/soc/txx9/Makefile
index 551f16c..37ad833 100644
--- a/sound/soc/txx9/Makefile
+++ b/sound/soc/txx9/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # Platform
 snd-soc-txx9aclc-objs := txx9aclc.o
 snd-soc-txx9aclc-ac97-objs := txx9aclc-ac97.o
diff --git a/sound/soc/ux500/Makefile b/sound/soc/ux500/Makefile
index cce0c11..e7d6de5 100644
--- a/sound/soc/ux500/Makefile
+++ b/sound/soc/ux500/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # Ux500 Platform Support
 
 snd-soc-ux500-plat-msp-i2s-objs := ux500_msp_dai.o ux500_msp_i2s.o