diff --git a/Makefile b/Makefile
index cbb3c9c..07311de 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 -include config.mk
 
 # Parameter for current board
diff --git a/src/arch/8051/arch.c b/src/arch/8051/arch.c
index 0b80938..9e9ff0d 100644
--- a/src/arch/8051/arch.c
+++ b/src/arch/8051/arch.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <8051.h>
 
 #include <arch/arch.h>
diff --git a/src/arch/8051/arch.mk b/src/arch/8051/arch.mk
index 8070a8d..1d7ef6c 100644
--- a/src/arch/8051/arch.mk
+++ b/src/arch/8051/arch.mk
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 CC=sdcc -mmcs51 --model-large --Werror
 OBJ=$(patsubst src/%.c,$(BUILD)/%.rel,$(SRC))
 
diff --git a/src/arch/8051/delay.c b/src/arch/8051/delay.c
index 841993c..7c1fefa 100644
--- a/src/arch/8051/delay.c
+++ b/src/arch/8051/delay.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Uses timer 1 to implement delays
 
 #include <8051.h>
diff --git a/src/arch/8051/include/arch/arch.h b/src/arch/8051/include/arch/arch.h
index 6880cf6..27e198d 100644
--- a/src/arch/8051/include/arch/arch.h
+++ b/src/arch/8051/include/arch/arch.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _ARCH_ARCH_H
 #define _ARCH_ARCH_H
 
diff --git a/src/arch/8051/include/arch/delay.h b/src/arch/8051/include/arch/delay.h
index 30fa7db..0d44408 100644
--- a/src/arch/8051/include/arch/delay.h
+++ b/src/arch/8051/include/arch/delay.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _ARCH_DELAY_H
 #define _ARCH_DELAY_H
 
diff --git a/src/arch/8051/include/arch/time.h b/src/arch/8051/include/arch/time.h
index ee243e6..9fb414c 100644
--- a/src/arch/8051/include/arch/time.h
+++ b/src/arch/8051/include/arch/time.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _ARCH_TIME_H
 #define _ARCH_TIME_H
 
diff --git a/src/arch/8051/time.c b/src/arch/8051/time.c
index 6842a1d..3b41927 100644
--- a/src/arch/8051/time.c
+++ b/src/arch/8051/time.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Uses timer 0 to keep track of global time
 
 #include <8051.h>
diff --git a/src/arch/avr/arch.mk b/src/arch/avr/arch.mk
index 248f3fe..a847964 100644
--- a/src/arch/avr/arch.mk
+++ b/src/arch/avr/arch.mk
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 CC=avr-gcc -mmcu=$(EC)
 CFLAGS+=-Os -fstack-usage -Wall -Werror -Wl,--gc-sections -Wl,-u,vfprintf -lprintf_flt
 OBJ=$(patsubst src/%.c,$(BUILD)/%.o,$(SRC))
diff --git a/src/arch/avr/gpio.c b/src/arch/avr/gpio.c
index 95e036d..9d90797 100644
--- a/src/arch/avr/gpio.c
+++ b/src/arch/avr/gpio.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <arch/gpio.h>
 
 bool gpio_get_dir(struct Gpio * gpio) {
diff --git a/src/arch/avr/i2c.c b/src/arch/avr/i2c.c
index eb00faa..5eb4380 100644
--- a/src/arch/avr/i2c.c
+++ b/src/arch/avr/i2c.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdio.h>
 #include <avr/io.h>
 #include <util/twi.h>
diff --git a/src/arch/avr/i2c_slave.c b/src/arch/avr/i2c_slave.c
index fa94d58..48b2a2c 100644
--- a/src/arch/avr/i2c_slave.c
+++ b/src/arch/avr/i2c_slave.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Based on https://github.com/thegouger/avr-i2c-slave
 
 #include <stdio.h>
diff --git a/src/arch/avr/include/arch/gpio.h b/src/arch/avr/include/arch/gpio.h
index f7484f1..35d763c 100644
--- a/src/arch/avr/include/arch/gpio.h
+++ b/src/arch/avr/include/arch/gpio.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _ARCH_GPIO_H
 #define _ARCH_GPIO_H
 
diff --git a/src/arch/avr/include/arch/i2c_slave.h b/src/arch/avr/include/arch/i2c_slave.h
index bf1af8f..be23950 100644
--- a/src/arch/avr/include/arch/i2c_slave.h
+++ b/src/arch/avr/include/arch/i2c_slave.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _ARCH_I2C_SLAVE_H
 #define _ARCH_I2C_SLAVE_H
 
diff --git a/src/arch/avr/include/arch/uart.h b/src/arch/avr/include/arch/uart.h
index 588f295..80e7dfd 100644
--- a/src/arch/avr/include/arch/uart.h
+++ b/src/arch/avr/include/arch/uart.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _ARCH_UART_H
 #define _ARCH_UART_H
 
diff --git a/src/arch/avr/uart.c b/src/arch/avr/uart.c
index 08a084b..c012a72 100644
--- a/src/arch/avr/uart.c
+++ b/src/arch/avr/uart.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdio.h>
 #include <avr/io.h>
 
diff --git a/src/board/arduino/mega2560/battery.c b/src/board/arduino/mega2560/battery.c
index 20be078..5f6ce3d 100644
--- a/src/board/arduino/mega2560/battery.c
+++ b/src/board/arduino/mega2560/battery.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdio.h>
 
 #include <common/i2c.h>
diff --git a/src/board/arduino/mega2560/board.mk b/src/board/arduino/mega2560/board.mk
index 75a2091..238026a 100644
--- a/src/board/arduino/mega2560/board.mk
+++ b/src/board/arduino/mega2560/board.mk
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 EC=atmega2560
 
 PORT=$(wildcard /dev/ttyACM*)
diff --git a/src/board/arduino/mega2560/i2c.c b/src/board/arduino/mega2560/i2c.c
index 4b30c65..46d3ead 100644
--- a/src/board/arduino/mega2560/i2c.c
+++ b/src/board/arduino/mega2560/i2c.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <avr/io.h>
 
 #include <board/cpu.h>
diff --git a/src/board/arduino/mega2560/include/board/battery.h b/src/board/arduino/mega2560/include/board/battery.h
index 935ddad..a851afc 100644
--- a/src/board/arduino/mega2560/include/board/battery.h
+++ b/src/board/arduino/mega2560/include/board/battery.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_BATTERY_H
 #define _BOARD_BATTERY_H
 
diff --git a/src/board/arduino/mega2560/include/board/cpu.h b/src/board/arduino/mega2560/include/board/cpu.h
index 3d1fe04..bddbb11 100644
--- a/src/board/arduino/mega2560/include/board/cpu.h
+++ b/src/board/arduino/mega2560/include/board/cpu.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_CPU_H
 #define _BOARD_CPU_H
 
diff --git a/src/board/arduino/mega2560/include/board/i2c.h b/src/board/arduino/mega2560/include/board/i2c.h
index 450ca6c..735558f 100644
--- a/src/board/arduino/mega2560/include/board/i2c.h
+++ b/src/board/arduino/mega2560/include/board/i2c.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_I2C_H
 #define _BOARD_I2C_H
 
diff --git a/src/board/arduino/mega2560/main.c b/src/board/arduino/mega2560/main.c
index 9a4f5a9..a8067b4 100644
--- a/src/board/arduino/mega2560/main.c
+++ b/src/board/arduino/mega2560/main.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdio.h>
 
 #include <arch/gpio.h>
diff --git a/src/board/arduino/mega2560/parallel.c b/src/board/arduino/mega2560/parallel.c
index 5d14e88..aa3eb93 100644
--- a/src/board/arduino/mega2560/parallel.c
+++ b/src/board/arduino/mega2560/parallel.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // High resolution pinout can be found here:
 // https://osoyoo.com/wp-content/uploads/2017/08/arduino_mega_2560_pinout.png
 
diff --git a/src/board/arduino/micro/board.mk b/src/board/arduino/micro/board.mk
index 1add97b..ea81ddb 100644
--- a/src/board/arduino/micro/board.mk
+++ b/src/board/arduino/micro/board.mk
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 EC=atmega32u4
 
 PORT=$(wildcard /dev/ttyACM*)
diff --git a/src/board/arduino/micro/include/board/cpu.h b/src/board/arduino/micro/include/board/cpu.h
index 3d1fe04..bddbb11 100644
--- a/src/board/arduino/micro/include/board/cpu.h
+++ b/src/board/arduino/micro/include/board/cpu.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_CPU_H
 #define _BOARD_CPU_H
 
diff --git a/src/board/arduino/micro/main.c b/src/board/arduino/micro/main.c
index 4cb9490..cc1b372 100644
--- a/src/board/arduino/micro/main.c
+++ b/src/board/arduino/micro/main.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdio.h>
 
 #include <arch/gpio.h>
diff --git a/src/board/arduino/uno/battery.c b/src/board/arduino/uno/battery.c
index 20be078..5f6ce3d 100644
--- a/src/board/arduino/uno/battery.c
+++ b/src/board/arduino/uno/battery.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdio.h>
 
 #include <common/i2c.h>
diff --git a/src/board/arduino/uno/board.mk b/src/board/arduino/uno/board.mk
index 95c04e3..96c1f4a 100644
--- a/src/board/arduino/uno/board.mk
+++ b/src/board/arduino/uno/board.mk
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 EC=atmega328p
 
 PORT=$(wildcard /dev/ttyACM*)
diff --git a/src/board/arduino/uno/i2c.c b/src/board/arduino/uno/i2c.c
index 4b30c65..46d3ead 100644
--- a/src/board/arduino/uno/i2c.c
+++ b/src/board/arduino/uno/i2c.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <avr/io.h>
 
 #include <board/cpu.h>
diff --git a/src/board/arduino/uno/include/board/battery.h b/src/board/arduino/uno/include/board/battery.h
index 935ddad..a851afc 100644
--- a/src/board/arduino/uno/include/board/battery.h
+++ b/src/board/arduino/uno/include/board/battery.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_BATTERY_H
 #define _BOARD_BATTERY_H
 
diff --git a/src/board/arduino/uno/include/board/cpu.h b/src/board/arduino/uno/include/board/cpu.h
index 3d1fe04..bddbb11 100644
--- a/src/board/arduino/uno/include/board/cpu.h
+++ b/src/board/arduino/uno/include/board/cpu.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_CPU_H
 #define _BOARD_CPU_H
 
diff --git a/src/board/arduino/uno/include/board/i2c.h b/src/board/arduino/uno/include/board/i2c.h
index 450ca6c..735558f 100644
--- a/src/board/arduino/uno/include/board/i2c.h
+++ b/src/board/arduino/uno/include/board/i2c.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_I2C_H
 #define _BOARD_I2C_H
 
diff --git a/src/board/arduino/uno/main.c b/src/board/arduino/uno/main.c
index bd064e0..5e90797 100644
--- a/src/board/arduino/uno/main.c
+++ b/src/board/arduino/uno/main.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdio.h>
 
 #include <arch/gpio.h>
diff --git a/src/board/arduino/uno/parallel.c b/src/board/arduino/uno/parallel.c
index 48ecd34..109be1a 100644
--- a/src/board/arduino/uno/parallel.c
+++ b/src/board/arduino/uno/parallel.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // High resolution pinout can be found here:
 // https://osoyoo.com/wp-content/uploads/2017/08/arduino_mega_2560_pinout.png
 
diff --git a/src/board/system76/addw2/board.c b/src/board/system76/addw2/board.c
index 212ca61..6219134 100644
--- a/src/board/system76/addw2/board.c
+++ b/src/board/system76/addw2/board.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <arch/time.h>
 #include <board/battery.h>
 #include <board/board.h>
diff --git a/src/board/system76/addw2/board.mk b/src/board/system76/addw2/board.mk
index e22aaa2..3a6bd21 100644
--- a/src/board/system76/addw2/board.mk
+++ b/src/board/system76/addw2/board.mk
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 EC=it5570e
 
 # Add keymap to src
diff --git a/src/board/system76/addw2/gpio.c b/src/board/system76/addw2/gpio.c
index 35daa47..17320eb 100644
--- a/src/board/system76/addw2/gpio.c
+++ b/src/board/system76/addw2/gpio.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/gpio.h>
 #include <common/debug.h>
 
diff --git a/src/board/system76/addw2/include/board/gpio.h b/src/board/system76/addw2/include/board/gpio.h
index 36d8879..4aae0b4 100644
--- a/src/board/system76/addw2/include/board/gpio.h
+++ b/src/board/system76/addw2/include/board/gpio.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_GPIO_H
 #define _BOARD_GPIO_H
 
diff --git a/src/board/system76/addw2/include/board/keymap.h b/src/board/system76/addw2/include/board/keymap.h
index eacd404..35df611 100644
--- a/src/board/system76/addw2/include/board/keymap.h
+++ b/src/board/system76/addw2/include/board/keymap.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_KEYMAP_H
 #define _BOARD_KEYMAP_H
 
diff --git a/src/board/system76/addw2/kbled.c b/src/board/system76/addw2/kbled.c
index abacb2a..0f262e4 100644
--- a/src/board/system76/addw2/kbled.c
+++ b/src/board/system76/addw2/kbled.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/kbled.h>
 #include <ec/pwm.h>
 
diff --git a/src/board/system76/addw2/keymap/default.c b/src/board/system76/addw2/keymap/default.c
index 65d46ce..c79628a 100644
--- a/src/board/system76/addw2/keymap/default.c
+++ b/src/board/system76/addw2/keymap/default.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Default layout
 
 #include <board/keymap.h>
diff --git a/src/board/system76/addw2/keymap/jeremy.c b/src/board/system76/addw2/keymap/jeremy.c
index 2d19a63..87a950f 100644
--- a/src/board/system76/addw2/keymap/jeremy.c
+++ b/src/board/system76/addw2/keymap/jeremy.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Default layout
 
 #include <board/keymap.h>
diff --git a/src/board/system76/bonw14/board.c b/src/board/system76/bonw14/board.c
index 69f5cf5..65fc103 100644
--- a/src/board/system76/bonw14/board.c
+++ b/src/board/system76/bonw14/board.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <arch/time.h>
 #include <board/battery.h>
 #include <board/board.h>
diff --git a/src/board/system76/bonw14/board.mk b/src/board/system76/bonw14/board.mk
index a7380be..f5b4438 100644
--- a/src/board/system76/bonw14/board.mk
+++ b/src/board/system76/bonw14/board.mk
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 EC=it5570e
 
 # Add keymap to src
diff --git a/src/board/system76/bonw14/gpio.c b/src/board/system76/bonw14/gpio.c
index d8e690c..007e36f 100644
--- a/src/board/system76/bonw14/gpio.c
+++ b/src/board/system76/bonw14/gpio.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/gpio.h>
 #include <common/debug.h>
 
diff --git a/src/board/system76/bonw14/include/board/gpio.h b/src/board/system76/bonw14/include/board/gpio.h
index 1b8fcd3..1f43e73 100644
--- a/src/board/system76/bonw14/include/board/gpio.h
+++ b/src/board/system76/bonw14/include/board/gpio.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_GPIO_H
 #define _BOARD_GPIO_H
 
diff --git a/src/board/system76/bonw14/include/board/keymap.h b/src/board/system76/bonw14/include/board/keymap.h
index f820f6f..278e5c0 100644
--- a/src/board/system76/bonw14/include/board/keymap.h
+++ b/src/board/system76/bonw14/include/board/keymap.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_KEYMAP_H
 #define _BOARD_KEYMAP_H
 
diff --git a/src/board/system76/bonw14/kbled.c b/src/board/system76/bonw14/kbled.c
index 53db08c..b651279 100644
--- a/src/board/system76/bonw14/kbled.c
+++ b/src/board/system76/bonw14/kbled.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/kbled.h>
 #include <common/debug.h>
 #include <ec/i2c.h>
diff --git a/src/board/system76/bonw14/keymap/default.c b/src/board/system76/bonw14/keymap/default.c
index 65d46ce..c79628a 100644
--- a/src/board/system76/bonw14/keymap/default.c
+++ b/src/board/system76/bonw14/keymap/default.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Default layout
 
 #include <board/keymap.h>
diff --git a/src/board/system76/bonw14/keymap/jeremy.c b/src/board/system76/bonw14/keymap/jeremy.c
index 2d19a63..87a950f 100644
--- a/src/board/system76/bonw14/keymap/jeremy.c
+++ b/src/board/system76/bonw14/keymap/jeremy.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Default layout
 
 #include <board/keymap.h>
diff --git a/src/board/system76/common/acpi.c b/src/board/system76/common/acpi.c
index 06cce93..9f6642d 100644
--- a/src/board/system76/common/acpi.c
+++ b/src/board/system76/common/acpi.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/acpi.h>
 #include <board/battery.h>
 #include <board/dgpu.h>
diff --git a/src/board/system76/common/battery.c b/src/board/system76/common/battery.c
index ca23e54..a2f6228 100644
--- a/src/board/system76/common/battery.c
+++ b/src/board/system76/common/battery.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/battery.h>
 #include <board/smbus.h>
 #include <common/debug.h>
diff --git a/src/board/system76/common/common.mk b/src/board/system76/common/common.mk
index 30c9bff..e1f6224 100644
--- a/src/board/system76/common/common.mk
+++ b/src/board/system76/common/common.mk
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 # Set log level
 # 0 - NONE
 # 1 - ERROR
diff --git a/src/board/system76/common/dgpu.c b/src/board/system76/common/dgpu.c
index 5b25744..c76b714 100644
--- a/src/board/system76/common/dgpu.c
+++ b/src/board/system76/common/dgpu.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/dgpu.h>
 
 #if HAVE_DGPU
diff --git a/src/board/system76/common/ecpm.c b/src/board/system76/common/ecpm.c
index 6aa87ab..fc51a74 100644
--- a/src/board/system76/common/ecpm.c
+++ b/src/board/system76/common/ecpm.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/ecpm.h>
 
 void ecpm_init(void) {
diff --git a/src/board/system76/common/gctrl.c b/src/board/system76/common/gctrl.c
index a13e19d..0ff7d63 100644
--- a/src/board/system76/common/gctrl.c
+++ b/src/board/system76/common/gctrl.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/gctrl.h>
 
 void gctrl_init(void) {
diff --git a/src/board/system76/common/include/board/acpi.h b/src/board/system76/common/include/board/acpi.h
index d9ea9df..c4a36eb 100644
--- a/src/board/system76/common/include/board/acpi.h
+++ b/src/board/system76/common/include/board/acpi.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_ACPI_H
 #define _BOARD_ACPI_H
 
diff --git a/src/board/system76/common/include/board/battery.h b/src/board/system76/common/include/board/battery.h
index eb3c6c5..e6dd781 100644
--- a/src/board/system76/common/include/board/battery.h
+++ b/src/board/system76/common/include/board/battery.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_BATTERY_H
 #define _BOARD_BATTERY_H
 
diff --git a/src/board/system76/common/include/board/board.h b/src/board/system76/common/include/board/board.h
index f7c3dc6..39886ae 100644
--- a/src/board/system76/common/include/board/board.h
+++ b/src/board/system76/common/include/board/board.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_BOARD_H
 #define _BOARD_BOARD_H
 
diff --git a/src/board/system76/common/include/board/cpu.h b/src/board/system76/common/include/board/cpu.h
index 1ed4f4d..d7e7436 100644
--- a/src/board/system76/common/include/board/cpu.h
+++ b/src/board/system76/common/include/board/cpu.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_CPU_H
 #define _BOARD_CPU_H
 
diff --git a/src/board/system76/common/include/board/dgpu.h b/src/board/system76/common/include/board/dgpu.h
index 17166f6..b68fa31 100644
--- a/src/board/system76/common/include/board/dgpu.h
+++ b/src/board/system76/common/include/board/dgpu.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_DGPU_H
 #define _BOARD_DGPU_H
 
diff --git a/src/board/system76/common/include/board/ecpm.h b/src/board/system76/common/include/board/ecpm.h
index 2b10105..fc26719 100644
--- a/src/board/system76/common/include/board/ecpm.h
+++ b/src/board/system76/common/include/board/ecpm.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_ECPM_H
 #define _BOARD_ECPM_H
 
diff --git a/src/board/system76/common/include/board/gctrl.h b/src/board/system76/common/include/board/gctrl.h
index 80eae12..d3ea4a1 100644
--- a/src/board/system76/common/include/board/gctrl.h
+++ b/src/board/system76/common/include/board/gctrl.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_GCTRL_H
 #define _BOARD_GCTRL_H
 
diff --git a/src/board/system76/common/include/board/kbc.h b/src/board/system76/common/include/board/kbc.h
index 742c5f8..dbf7141 100644
--- a/src/board/system76/common/include/board/kbc.h
+++ b/src/board/system76/common/include/board/kbc.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_KBC_H
 #define _BOARD_KBC_H
 
diff --git a/src/board/system76/common/include/board/kbled.h b/src/board/system76/common/include/board/kbled.h
index 895542c..7e82832 100644
--- a/src/board/system76/common/include/board/kbled.h
+++ b/src/board/system76/common/include/board/kbled.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_KBLED_H
 #define _BOARD_KBLED_H
 
diff --git a/src/board/system76/common/include/board/kbscan.h b/src/board/system76/common/include/board/kbscan.h
index f5b8198..2c02769 100644
--- a/src/board/system76/common/include/board/kbscan.h
+++ b/src/board/system76/common/include/board/kbscan.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_KBSCAN_H
 #define _BOARD_KBSCAN_H
 
diff --git a/src/board/system76/common/include/board/lid.h b/src/board/system76/common/include/board/lid.h
index 90ad66a..1ef64b1 100644
--- a/src/board/system76/common/include/board/lid.h
+++ b/src/board/system76/common/include/board/lid.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_LID_H
 #define _BOARD_LID_H
 
diff --git a/src/board/system76/common/include/board/parallel.h b/src/board/system76/common/include/board/parallel.h
index 9eb78dc..e117dba 100644
--- a/src/board/system76/common/include/board/parallel.h
+++ b/src/board/system76/common/include/board/parallel.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_PARALLEL_H
 #define _BOARD_PARALLEL_H
 
diff --git a/src/board/system76/common/include/board/peci.h b/src/board/system76/common/include/board/peci.h
index 9e7015c..745ef69 100644
--- a/src/board/system76/common/include/board/peci.h
+++ b/src/board/system76/common/include/board/peci.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_PECI_H
 #define _BOARD_PECI_H
 
diff --git a/src/board/system76/common/include/board/pmc.h b/src/board/system76/common/include/board/pmc.h
index 65ea613..02f7fdf 100644
--- a/src/board/system76/common/include/board/pmc.h
+++ b/src/board/system76/common/include/board/pmc.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_PMC_H
 #define _BOARD_PMC_H
 
diff --git a/src/board/system76/common/include/board/pnp.h b/src/board/system76/common/include/board/pnp.h
index 53dbb68..09cf8bc 100644
--- a/src/board/system76/common/include/board/pnp.h
+++ b/src/board/system76/common/include/board/pnp.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_PNP_H
 #define _BOARD_PNP_H
 
diff --git a/src/board/system76/common/include/board/power.h b/src/board/system76/common/include/board/power.h
index 9c29f84..5ff6fc6 100644
--- a/src/board/system76/common/include/board/power.h
+++ b/src/board/system76/common/include/board/power.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_POWER_H
 #define _BOARD_POWER_H
 
diff --git a/src/board/system76/common/include/board/ps2.h b/src/board/system76/common/include/board/ps2.h
index 34ad6ac..5b40239 100644
--- a/src/board/system76/common/include/board/ps2.h
+++ b/src/board/system76/common/include/board/ps2.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_PS2_H
 #define _BOARD_PS2_H
 
diff --git a/src/board/system76/common/include/board/pwm.h b/src/board/system76/common/include/board/pwm.h
index 256fde8..6455310 100644
--- a/src/board/system76/common/include/board/pwm.h
+++ b/src/board/system76/common/include/board/pwm.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_PWM_H
 #define _BOARD_PWM_H
 
diff --git a/src/board/system76/common/include/board/scratch.h b/src/board/system76/common/include/board/scratch.h
index 797b92e..f93e778 100644
--- a/src/board/system76/common/include/board/scratch.h
+++ b/src/board/system76/common/include/board/scratch.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_SCRATCH_H
 #define _BOARD_SCRATCH_H
 
diff --git a/src/board/system76/common/include/board/smbus.h b/src/board/system76/common/include/board/smbus.h
index 6b3b141..a3f9512 100644
--- a/src/board/system76/common/include/board/smbus.h
+++ b/src/board/system76/common/include/board/smbus.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_SMBUS_H
 #define _BOARD_SMBUS_H
 
diff --git a/src/board/system76/common/include/board/smfi.h b/src/board/system76/common/include/board/smfi.h
index 2b27cfa..8d5d32b 100644
--- a/src/board/system76/common/include/board/smfi.h
+++ b/src/board/system76/common/include/board/smfi.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_SMFI_H
 #define _BOARD_SMFI_H
 
diff --git a/src/board/system76/common/include/board/touchpad.h b/src/board/system76/common/include/board/touchpad.h
index 05869fc..a5f258c 100644
--- a/src/board/system76/common/include/board/touchpad.h
+++ b/src/board/system76/common/include/board/touchpad.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_TOUCHPAD_H
 #define _BOARD_TOUCHPAD_H
 
diff --git a/src/board/system76/common/kbc.c b/src/board/system76/common/kbc.c
index 43f76b1..39d1e5e 100644
--- a/src/board/system76/common/kbc.c
+++ b/src/board/system76/common/kbc.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/kbc.h>
 #include <board/kbscan.h>
 #include <board/keymap.h>
diff --git a/src/board/system76/common/kbscan.c b/src/board/system76/common/kbscan.c
index 594cdfd..1642d3c 100644
--- a/src/board/system76/common/kbscan.c
+++ b/src/board/system76/common/kbscan.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <arch/delay.h>
 #include <arch/time.h>
 #include <board/gpio.h>
diff --git a/src/board/system76/common/keymap.c b/src/board/system76/common/keymap.c
index 74445e5..9d5d16b 100644
--- a/src/board/system76/common/keymap.c
+++ b/src/board/system76/common/keymap.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/keymap.h>
 #include <common/debug.h>
 
diff --git a/src/board/system76/common/lid.c b/src/board/system76/common/lid.c
index 4c11ae4..6c7d08d 100644
--- a/src/board/system76/common/lid.c
+++ b/src/board/system76/common/lid.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <arch/delay.h>
 #include <board/gpio.h>
 #include <board/lid.h>
diff --git a/src/board/system76/common/main.c b/src/board/system76/common/main.c
index bf52f9c..7a7410f 100644
--- a/src/board/system76/common/main.c
+++ b/src/board/system76/common/main.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <8051.h>
 #include <stdio.h>
 
diff --git a/src/board/system76/common/parallel.c b/src/board/system76/common/parallel.c
index c8f2346..9a6f675 100644
--- a/src/board/system76/common/parallel.c
+++ b/src/board/system76/common/parallel.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <arch/delay.h>
 #include <arch/time.h>
 #include <board/parallel.h>
diff --git a/src/board/system76/common/peci.c b/src/board/system76/common/peci.c
index 2f0f147..85b9a0e 100644
--- a/src/board/system76/common/peci.c
+++ b/src/board/system76/common/peci.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdbool.h>
 
 #include <board/peci.h>
diff --git a/src/board/system76/common/pmc.c b/src/board/system76/common/pmc.c
index d60cd98..87b88a6 100644
--- a/src/board/system76/common/pmc.c
+++ b/src/board/system76/common/pmc.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <arch/delay.h>
 #include <board/acpi.h>
 #include <board/gpio.h>
diff --git a/src/board/system76/common/pnp.c b/src/board/system76/common/pnp.c
index 8ab6cdb..d9a2ba5 100644
--- a/src/board/system76/common/pnp.c
+++ b/src/board/system76/common/pnp.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdint.h>
 
 #include <common/debug.h>
diff --git a/src/board/system76/common/power.c b/src/board/system76/common/power.c
index c939bf5..4105531 100644
--- a/src/board/system76/common/power.c
+++ b/src/board/system76/common/power.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <arch/delay.h>
 #include <arch/time.h>
 #include <board/acpi.h>
diff --git a/src/board/system76/common/ps2.c b/src/board/system76/common/ps2.c
index 237e061..da0c561 100644
--- a/src/board/system76/common/ps2.c
+++ b/src/board/system76/common/ps2.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/ps2.h>
 
 void ps2_init(void) {
diff --git a/src/board/system76/common/pwm.c b/src/board/system76/common/pwm.c
index b36e975..323ac34 100644
--- a/src/board/system76/common/pwm.c
+++ b/src/board/system76/common/pwm.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/pwm.h>
 
 void pwm_init(void) {
diff --git a/src/board/system76/common/scratch.c b/src/board/system76/common/scratch.c
index a675e55..208b792 100644
--- a/src/board/system76/common/scratch.c
+++ b/src/board/system76/common/scratch.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <8051.h>
 #include <stdint.h>
 
diff --git a/src/board/system76/common/scratch/main.c b/src/board/system76/common/scratch/main.c
index dffe493..0998629 100644
--- a/src/board/system76/common/scratch/main.c
+++ b/src/board/system76/common/scratch/main.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/smfi.h>
 
 // Main program while running in scratch ROM
diff --git a/src/board/system76/common/scratch/scratch.mk b/src/board/system76/common/scratch/scratch.mk
index 754f532..34fdc98 100644
--- a/src/board/system76/common/scratch/scratch.mk
+++ b/src/board/system76/common/scratch/scratch.mk
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 # Set scratch ROM parameters
 SCRATCH_OFFSET=1024
 SCRATCH_SIZE=1024
diff --git a/src/board/system76/common/scratch/stdio.c b/src/board/system76/common/scratch/stdio.c
index 62541dd..273947c 100644
--- a/src/board/system76/common/scratch/stdio.c
+++ b/src/board/system76/common/scratch/stdio.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdio.h>
 
 #include <board/smfi.h>
diff --git a/src/board/system76/common/smbus.c b/src/board/system76/common/smbus.c
index a5dfaec..5233ec7 100644
--- a/src/board/system76/common/smbus.c
+++ b/src/board/system76/common/smbus.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/smbus.h>
 #include <ec/i2c.h>
 
diff --git a/src/board/system76/common/smfi.c b/src/board/system76/common/smfi.c
index a1aae0b..1fc6557 100644
--- a/src/board/system76/common/smfi.c
+++ b/src/board/system76/common/smfi.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdint.h>
 #include <stdio.h>
 #include <string.h>
diff --git a/src/board/system76/common/stdio.c b/src/board/system76/common/stdio.c
index f44fe2f..fc925e9 100644
--- a/src/board/system76/common/stdio.c
+++ b/src/board/system76/common/stdio.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdio.h>
 
 #include <board/smfi.h>
diff --git a/src/board/system76/common/touchpad.c b/src/board/system76/common/touchpad.c
index 0b8fb69..f772d18 100644
--- a/src/board/system76/common/touchpad.c
+++ b/src/board/system76/common/touchpad.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/kbc.h>
 #include <board/touchpad.h>
 #include <common/debug.h>
diff --git a/src/board/system76/darp5/board.c b/src/board/system76/darp5/board.c
index cb5a96f..7725700 100644
--- a/src/board/system76/darp5/board.c
+++ b/src/board/system76/darp5/board.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/battery.h>
 #include <board/board.h>
 #include <board/gpio.h>
diff --git a/src/board/system76/darp5/board.mk b/src/board/system76/darp5/board.mk
index 686a64a..8dcfc9a 100644
--- a/src/board/system76/darp5/board.mk
+++ b/src/board/system76/darp5/board.mk
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 EC=it8587e
 
 # Add keymap to src
diff --git a/src/board/system76/darp5/gpio.c b/src/board/system76/darp5/gpio.c
index 279c394..915a3aa 100644
--- a/src/board/system76/darp5/gpio.c
+++ b/src/board/system76/darp5/gpio.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/gpio.h>
 #include <common/debug.h>
 
diff --git a/src/board/system76/darp5/include/board/gpio.h b/src/board/system76/darp5/include/board/gpio.h
index 0f34c23..1d42285 100644
--- a/src/board/system76/darp5/include/board/gpio.h
+++ b/src/board/system76/darp5/include/board/gpio.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_GPIO_H
 #define _BOARD_GPIO_H
 
diff --git a/src/board/system76/darp5/include/board/keymap.h b/src/board/system76/darp5/include/board/keymap.h
index eacd404..35df611 100644
--- a/src/board/system76/darp5/include/board/keymap.h
+++ b/src/board/system76/darp5/include/board/keymap.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_KEYMAP_H
 #define _BOARD_KEYMAP_H
 
diff --git a/src/board/system76/darp5/kbled.c b/src/board/system76/darp5/kbled.c
index 6066e16..f1178bf 100644
--- a/src/board/system76/darp5/kbled.c
+++ b/src/board/system76/darp5/kbled.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <arch/delay.h>
 #include <board/kbled.h>
 #include <common/macro.h>
diff --git a/src/board/system76/darp5/keymap/default.c b/src/board/system76/darp5/keymap/default.c
index 65d46ce..c79628a 100644
--- a/src/board/system76/darp5/keymap/default.c
+++ b/src/board/system76/darp5/keymap/default.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Default layout
 
 #include <board/keymap.h>
diff --git a/src/board/system76/darp5/keymap/jeremy.c b/src/board/system76/darp5/keymap/jeremy.c
index 2d19a63..87a950f 100644
--- a/src/board/system76/darp5/keymap/jeremy.c
+++ b/src/board/system76/darp5/keymap/jeremy.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Default layout
 
 #include <board/keymap.h>
diff --git a/src/board/system76/galp3-c/board.c b/src/board/system76/galp3-c/board.c
index cb5a96f..7725700 100644
--- a/src/board/system76/galp3-c/board.c
+++ b/src/board/system76/galp3-c/board.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/battery.h>
 #include <board/board.h>
 #include <board/gpio.h>
diff --git a/src/board/system76/galp3-c/board.mk b/src/board/system76/galp3-c/board.mk
index 278192e..cbc0f19 100644
--- a/src/board/system76/galp3-c/board.mk
+++ b/src/board/system76/galp3-c/board.mk
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 EC=it8587e
 
 # Add keymap to src
diff --git a/src/board/system76/galp3-c/gpio.c b/src/board/system76/galp3-c/gpio.c
index 5f407f0..16c947c 100644
--- a/src/board/system76/galp3-c/gpio.c
+++ b/src/board/system76/galp3-c/gpio.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/gpio.h>
 #include <common/debug.h>
 
diff --git a/src/board/system76/galp3-c/include/board/gpio.h b/src/board/system76/galp3-c/include/board/gpio.h
index 0f34c23..1d42285 100644
--- a/src/board/system76/galp3-c/include/board/gpio.h
+++ b/src/board/system76/galp3-c/include/board/gpio.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_GPIO_H
 #define _BOARD_GPIO_H
 
diff --git a/src/board/system76/galp3-c/include/board/keymap.h b/src/board/system76/galp3-c/include/board/keymap.h
index e24dce1..bfaa253 100644
--- a/src/board/system76/galp3-c/include/board/keymap.h
+++ b/src/board/system76/galp3-c/include/board/keymap.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_KEYMAP_H
 #define _BOARD_KEYMAP_H
 
diff --git a/src/board/system76/galp3-c/kbled.c b/src/board/system76/galp3-c/kbled.c
index e0c53a1..ccef22a 100644
--- a/src/board/system76/galp3-c/kbled.c
+++ b/src/board/system76/galp3-c/kbled.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/kbled.h>
 #include <common/macro.h>
 #include <ec/dac.h>
diff --git a/src/board/system76/galp3-c/keymap/carl.c b/src/board/system76/galp3-c/keymap/carl.c
index 0e6f79a..6472a19 100644
--- a/src/board/system76/galp3-c/keymap/carl.c
+++ b/src/board/system76/galp3-c/keymap/carl.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Default layout - http://www.keyboard-layout-editor.com/#/gists/6aec6d441a039b76ec0895bd6bbda68d
 
 #include <board/keymap.h>
diff --git a/src/board/system76/galp3-c/keymap/default.c b/src/board/system76/galp3-c/keymap/default.c
index f670879..4220c13 100644
--- a/src/board/system76/galp3-c/keymap/default.c
+++ b/src/board/system76/galp3-c/keymap/default.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Default layout - http://www.keyboard-layout-editor.com/#/gists/6aec6d441a039b76ec0895bd6bbda68d
 
 #include <board/keymap.h>
diff --git a/src/board/system76/galp3-c/keymap/jeremy.c b/src/board/system76/galp3-c/keymap/jeremy.c
index c8a2208..ee0187e 100644
--- a/src/board/system76/galp3-c/keymap/jeremy.c
+++ b/src/board/system76/galp3-c/keymap/jeremy.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Jeremy's layout - http://www.keyboard-layout-editor.com/#/gists/fe00274727fc01b78a79d79473cd547c
 
 #include <board/keymap.h>
diff --git a/src/board/system76/gaze15/board.c b/src/board/system76/gaze15/board.c
index 0e58483..3501528 100644
--- a/src/board/system76/gaze15/board.c
+++ b/src/board/system76/gaze15/board.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <arch/time.h>
 #include <board/battery.h>
 #include <board/board.h>
diff --git a/src/board/system76/gaze15/board.mk b/src/board/system76/gaze15/board.mk
index bb968d7..7452964 100644
--- a/src/board/system76/gaze15/board.mk
+++ b/src/board/system76/gaze15/board.mk
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 EC=it5570e
 
 # Add keymap to src
diff --git a/src/board/system76/gaze15/gpio.c b/src/board/system76/gaze15/gpio.c
index d450a22..bee8be0 100644
--- a/src/board/system76/gaze15/gpio.c
+++ b/src/board/system76/gaze15/gpio.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/gpio.h>
 #include <common/debug.h>
 
diff --git a/src/board/system76/gaze15/include/board/gpio.h b/src/board/system76/gaze15/include/board/gpio.h
index 3cc1671..980aee6 100644
--- a/src/board/system76/gaze15/include/board/gpio.h
+++ b/src/board/system76/gaze15/include/board/gpio.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_GPIO_H
 #define _BOARD_GPIO_H
 
diff --git a/src/board/system76/gaze15/include/board/keymap.h b/src/board/system76/gaze15/include/board/keymap.h
index eacd404..35df611 100644
--- a/src/board/system76/gaze15/include/board/keymap.h
+++ b/src/board/system76/gaze15/include/board/keymap.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_KEYMAP_H
 #define _BOARD_KEYMAP_H
 
diff --git a/src/board/system76/gaze15/kbled.c b/src/board/system76/gaze15/kbled.c
index abacb2a..0f262e4 100644
--- a/src/board/system76/gaze15/kbled.c
+++ b/src/board/system76/gaze15/kbled.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/kbled.h>
 #include <ec/pwm.h>
 
diff --git a/src/board/system76/gaze15/keymap/default.c b/src/board/system76/gaze15/keymap/default.c
index 65d46ce..c79628a 100644
--- a/src/board/system76/gaze15/keymap/default.c
+++ b/src/board/system76/gaze15/keymap/default.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Default layout
 
 #include <board/keymap.h>
diff --git a/src/board/system76/gaze15/keymap/jeremy.c b/src/board/system76/gaze15/keymap/jeremy.c
index 2d19a63..87a950f 100644
--- a/src/board/system76/gaze15/keymap/jeremy.c
+++ b/src/board/system76/gaze15/keymap/jeremy.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Default layout
 
 #include <board/keymap.h>
diff --git a/src/board/system76/lemp9/board.c b/src/board/system76/lemp9/board.c
index 7fe84bd..3d46cdb 100644
--- a/src/board/system76/lemp9/board.c
+++ b/src/board/system76/lemp9/board.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/board.h>
 #include <board/gpio.h>
 #include <board/power.h>
diff --git a/src/board/system76/lemp9/board.mk b/src/board/system76/lemp9/board.mk
index 22f0f10..5d111a1 100644
--- a/src/board/system76/lemp9/board.mk
+++ b/src/board/system76/lemp9/board.mk
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 EC=it5570e
 
 # Add keymap to src
diff --git a/src/board/system76/lemp9/gpio.c b/src/board/system76/lemp9/gpio.c
index b2a212c..60561c7 100644
--- a/src/board/system76/lemp9/gpio.c
+++ b/src/board/system76/lemp9/gpio.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/gpio.h>
 #include <common/debug.h>
 
diff --git a/src/board/system76/lemp9/include/board/gpio.h b/src/board/system76/lemp9/include/board/gpio.h
index f4f7877..fbc923e 100644
--- a/src/board/system76/lemp9/include/board/gpio.h
+++ b/src/board/system76/lemp9/include/board/gpio.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_GPIO_H
 #define _BOARD_GPIO_H
 
diff --git a/src/board/system76/lemp9/include/board/keymap.h b/src/board/system76/lemp9/include/board/keymap.h
index cf81558..543a0c3 100644
--- a/src/board/system76/lemp9/include/board/keymap.h
+++ b/src/board/system76/lemp9/include/board/keymap.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_KEYMAP_H
 #define _BOARD_KEYMAP_H
 
diff --git a/src/board/system76/lemp9/kbled.c b/src/board/system76/lemp9/kbled.c
index 77f20f8..1ef92d1 100644
--- a/src/board/system76/lemp9/kbled.c
+++ b/src/board/system76/lemp9/kbled.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/kbled.h>
 #include <common/macro.h>
 #include <ec/dac.h>
diff --git a/src/board/system76/lemp9/keymap/default.c b/src/board/system76/lemp9/keymap/default.c
index 94ba544..79e16af 100644
--- a/src/board/system76/lemp9/keymap/default.c
+++ b/src/board/system76/lemp9/keymap/default.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Default layout
 
 #include <board/keymap.h>
diff --git a/src/board/system76/lemp9/keymap/ins-prtsc.c b/src/board/system76/lemp9/keymap/ins-prtsc.c
index 9b1c239..ccfc7fa 100644
--- a/src/board/system76/lemp9/keymap/ins-prtsc.c
+++ b/src/board/system76/lemp9/keymap/ins-prtsc.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // PrtSc == Insert
 // Fn + PrtSc == Print Screen
 
diff --git a/src/board/system76/lemp9/keymap/jeremy.c b/src/board/system76/lemp9/keymap/jeremy.c
index 56a9987..f516087 100644
--- a/src/board/system76/lemp9/keymap/jeremy.c
+++ b/src/board/system76/lemp9/keymap/jeremy.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Jeremy's layout
 
 #include <board/keymap.h>
diff --git a/src/board/system76/lemp9/keymap/levi.c b/src/board/system76/lemp9/keymap/levi.c
index 4802632..cfb70fe 100644
--- a/src/board/system76/lemp9/keymap/levi.c
+++ b/src/board/system76/lemp9/keymap/levi.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Default layout
 
 #include <board/keymap.h>
diff --git a/src/board/system76/oryp5/include/board/gpio.h b/src/board/system76/oryp5/include/board/gpio.h
index f78c3e7..66d5a1a 100644
--- a/src/board/system76/oryp5/include/board/gpio.h
+++ b/src/board/system76/oryp5/include/board/gpio.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-only */
+// SPDX-License-Identifier: GPL-3.0-only
 
 #ifndef _BOARD_GPIO_H
 #define _BOARD_GPIO_H
diff --git a/src/board/system76/oryp5/include/board/keymap.h b/src/board/system76/oryp5/include/board/keymap.h
index a96a6bb..35df611 100644
--- a/src/board/system76/oryp5/include/board/keymap.h
+++ b/src/board/system76/oryp5/include/board/keymap.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-only */
+// SPDX-License-Identifier: GPL-3.0-only
 
 #ifndef _BOARD_KEYMAP_H
 #define _BOARD_KEYMAP_H
diff --git a/src/board/system76/oryp6/board.c b/src/board/system76/oryp6/board.c
index 69f5cf5..65fc103 100644
--- a/src/board/system76/oryp6/board.c
+++ b/src/board/system76/oryp6/board.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <arch/time.h>
 #include <board/battery.h>
 #include <board/board.h>
diff --git a/src/board/system76/oryp6/board.mk b/src/board/system76/oryp6/board.mk
index 2064396..f1fea4f 100644
--- a/src/board/system76/oryp6/board.mk
+++ b/src/board/system76/oryp6/board.mk
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 EC=it5570e
 
 # Add keymap to src
diff --git a/src/board/system76/oryp6/gpio.c b/src/board/system76/oryp6/gpio.c
index 0c07ddb..49ff70e 100644
--- a/src/board/system76/oryp6/gpio.c
+++ b/src/board/system76/oryp6/gpio.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/gpio.h>
 #include <common/debug.h>
 
diff --git a/src/board/system76/oryp6/include/board/gpio.h b/src/board/system76/oryp6/include/board/gpio.h
index b3f57d5..a4249e6 100644
--- a/src/board/system76/oryp6/include/board/gpio.h
+++ b/src/board/system76/oryp6/include/board/gpio.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_GPIO_H
 #define _BOARD_GPIO_H
 
diff --git a/src/board/system76/oryp6/include/board/keymap.h b/src/board/system76/oryp6/include/board/keymap.h
index eacd404..35df611 100644
--- a/src/board/system76/oryp6/include/board/keymap.h
+++ b/src/board/system76/oryp6/include/board/keymap.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _BOARD_KEYMAP_H
 #define _BOARD_KEYMAP_H
 
diff --git a/src/board/system76/oryp6/kbled.c b/src/board/system76/oryp6/kbled.c
index abacb2a..0f262e4 100644
--- a/src/board/system76/oryp6/kbled.c
+++ b/src/board/system76/oryp6/kbled.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/kbled.h>
 #include <ec/pwm.h>
 
diff --git a/src/board/system76/oryp6/keymap/default.c b/src/board/system76/oryp6/keymap/default.c
index 65d46ce..c79628a 100644
--- a/src/board/system76/oryp6/keymap/default.c
+++ b/src/board/system76/oryp6/keymap/default.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Default layout
 
 #include <board/keymap.h>
diff --git a/src/board/system76/oryp6/keymap/jeremy.c b/src/board/system76/oryp6/keymap/jeremy.c
index 2d19a63..87a950f 100644
--- a/src/board/system76/oryp6/keymap/jeremy.c
+++ b/src/board/system76/oryp6/keymap/jeremy.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 // Default layout
 
 #include <board/keymap.h>
diff --git a/src/common/i2c.c b/src/common/i2c.c
index d3ecf65..d1ccd69 100644
--- a/src/common/i2c.c
+++ b/src/common/i2c.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <common/i2c.h>
 
 int i2c_recv(struct I2C * i2c, uint8_t addr, uint8_t* data, int length) {
diff --git a/src/common/include/common/command.h b/src/common/include/common/command.h
index 0f36400..2b8eafc 100644
--- a/src/common/include/common/command.h
+++ b/src/common/include/common/command.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _COMMON_COMMAND_H
 #define _COMMON_COMMAND_H
 
diff --git a/src/common/include/common/debug.h b/src/common/include/common/debug.h
index 76449c4..f7eeb31 100644
--- a/src/common/include/common/debug.h
+++ b/src/common/include/common/debug.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _COMMON_DEBUG_H
 #define _COMMON_DEBUG_H
 
diff --git a/src/common/include/common/i2c.h b/src/common/include/common/i2c.h
index 9e3b9b3..e89951f 100644
--- a/src/common/include/common/i2c.h
+++ b/src/common/include/common/i2c.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _COMMON_I2C_H
 #define _COMMON_I2C_H
 
diff --git a/src/common/include/common/keymap.h b/src/common/include/common/keymap.h
index 7605455..c699f03 100644
--- a/src/common/include/common/keymap.h
+++ b/src/common/include/common/keymap.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _COMMON_KEYMAP_H
 #define _COMMON_KEYMAP_H
 
diff --git a/src/common/include/common/macro.h b/src/common/include/common/macro.h
index b785aad..2da1d2b 100644
--- a/src/common/include/common/macro.h
+++ b/src/common/include/common/macro.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _COMMON_MACRO_H
 #define _COMMON_MACRO_H
 
diff --git a/src/common/include/common/version.h b/src/common/include/common/version.h
index ccf6c8a..0fc88fb 100644
--- a/src/common/include/common/version.h
+++ b/src/common/include/common/version.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _COMMON_VERSION_H
 #define _COMMON_VERSION_H
 
diff --git a/src/common/keymap.c b/src/common/keymap.c
index f032f4b..7fc0923 100644
--- a/src/common/keymap.c
+++ b/src/common/keymap.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <common/keymap.h>
 
 // Prevent failures to compile on AVR
diff --git a/src/common/version.c b/src/common/version.c
index 1eaae41..385fd5c 100644
--- a/src/common/version.c
+++ b/src/common/version.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <common/macro.h>
 
 // Prevent failures to compile on AVR
diff --git a/src/ec/atmega2560/ec.mk b/src/ec/atmega2560/ec.mk
index 40fb5ae..dbdd77d 100644
--- a/src/ec/atmega2560/ec.mk
+++ b/src/ec/atmega2560/ec.mk
@@ -1 +1,3 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 ARCH=avr
diff --git a/src/ec/atmega328p/ec.mk b/src/ec/atmega328p/ec.mk
index 40fb5ae..dbdd77d 100644
--- a/src/ec/atmega328p/ec.mk
+++ b/src/ec/atmega328p/ec.mk
@@ -1 +1,3 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 ARCH=avr
diff --git a/src/ec/atmega32u4/ec.mk b/src/ec/atmega32u4/ec.mk
index 40fb5ae..dbdd77d 100644
--- a/src/ec/atmega32u4/ec.mk
+++ b/src/ec/atmega32u4/ec.mk
@@ -1 +1,3 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 ARCH=avr
diff --git a/src/ec/it5570e/ec.c b/src/ec/it5570e/ec.c
index 9bc9085..22f5484 100644
--- a/src/ec/it5570e/ec.c
+++ b/src/ec/it5570e/ec.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <ec/ec.h>
 #include <ec/gctrl.h>
 
diff --git a/src/ec/it5570e/ec.mk b/src/ec/it5570e/ec.mk
index 1aa8151..fa1f312 100644
--- a/src/ec/it5570e/ec.mk
+++ b/src/ec/it5570e/ec.mk
@@ -1 +1,3 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 ARCH=8051
diff --git a/src/ec/it5570e/gpio.c b/src/ec/it5570e/gpio.c
index a0118f8..fe372ef 100644
--- a/src/ec/it5570e/gpio.c
+++ b/src/ec/it5570e/gpio.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <ec/gpio.h>
 
 bool gpio_get(struct Gpio * gpio) {
diff --git a/src/ec/it5570e/i2c.c b/src/ec/it5570e/i2c.c
index 8733010..1ee8813 100644
--- a/src/ec/it5570e/i2c.c
+++ b/src/ec/it5570e/i2c.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdbool.h>
 
 #include <common/i2c.h>
diff --git a/src/ec/it5570e/include/ec/bram.h b/src/ec/it5570e/include/ec/bram.h
index 7b9dc53..5e63f36 100644
--- a/src/ec/it5570e/include/ec/bram.h
+++ b/src/ec/it5570e/include/ec/bram.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_BRAM_H
 #define _EC_BRAM_H
 
diff --git a/src/ec/it5570e/include/ec/dac.h b/src/ec/it5570e/include/ec/dac.h
index af02a91..f79d904 100644
--- a/src/ec/it5570e/include/ec/dac.h
+++ b/src/ec/it5570e/include/ec/dac.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_DAC_H
 #define _EC_DAC_H
 
diff --git a/src/ec/it5570e/include/ec/ec.h b/src/ec/it5570e/include/ec/ec.h
index 4a40997..0183336 100644
--- a/src/ec/it5570e/include/ec/ec.h
+++ b/src/ec/it5570e/include/ec/ec.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_EC_H
 #define _EC_EC_H
 
diff --git a/src/ec/it5570e/include/ec/ecpm.h b/src/ec/it5570e/include/ec/ecpm.h
index 7546215..605c833 100644
--- a/src/ec/it5570e/include/ec/ecpm.h
+++ b/src/ec/it5570e/include/ec/ecpm.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_ECPM_H
 #define _EC_ECPM_H
 
diff --git a/src/ec/it5570e/include/ec/etwd.h b/src/ec/it5570e/include/ec/etwd.h
index ee86635..12eac7c 100644
--- a/src/ec/it5570e/include/ec/etwd.h
+++ b/src/ec/it5570e/include/ec/etwd.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_ECWD_H
 #define _EC_ECWD_H
 
diff --git a/src/ec/it5570e/include/ec/gctrl.h b/src/ec/it5570e/include/ec/gctrl.h
index 1704ab3..d4c6d00 100644
--- a/src/ec/it5570e/include/ec/gctrl.h
+++ b/src/ec/it5570e/include/ec/gctrl.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_GCTRL_H
 #define _EC_GCTRL_H
 
diff --git a/src/ec/it5570e/include/ec/gpio.h b/src/ec/it5570e/include/ec/gpio.h
index cf33f77..207fa91 100644
--- a/src/ec/it5570e/include/ec/gpio.h
+++ b/src/ec/it5570e/include/ec/gpio.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_GPIO_H
 #define _EC_GPIO_H
 
diff --git a/src/ec/it5570e/include/ec/i2c.h b/src/ec/it5570e/include/ec/i2c.h
index 641ccd5..fb09360 100644
--- a/src/ec/it5570e/include/ec/i2c.h
+++ b/src/ec/it5570e/include/ec/i2c.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_I2C_H
 #define _EC_I2C_H
 
diff --git a/src/ec/it5570e/include/ec/kbc.h b/src/ec/it5570e/include/ec/kbc.h
index b8bd8d9..c091a18 100644
--- a/src/ec/it5570e/include/ec/kbc.h
+++ b/src/ec/it5570e/include/ec/kbc.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_KBC_H
 #define _EC_KBC_H
 
diff --git a/src/ec/it5570e/include/ec/kbscan.h b/src/ec/it5570e/include/ec/kbscan.h
index 58dc162..180dc13 100644
--- a/src/ec/it5570e/include/ec/kbscan.h
+++ b/src/ec/it5570e/include/ec/kbscan.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_KBSCAN_H
 #define _EC_KBSCAN_H
 
diff --git a/src/ec/it5570e/include/ec/peci.h b/src/ec/it5570e/include/ec/peci.h
index acba568..6ad701d 100644
--- a/src/ec/it5570e/include/ec/peci.h
+++ b/src/ec/it5570e/include/ec/peci.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_PECI_H
 #define _EC_PECI_H
 
diff --git a/src/ec/it5570e/include/ec/pmc.h b/src/ec/it5570e/include/ec/pmc.h
index d51ef11..1397326 100644
--- a/src/ec/it5570e/include/ec/pmc.h
+++ b/src/ec/it5570e/include/ec/pmc.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_PMC_H
 #define _EC_PMC_H
 
diff --git a/src/ec/it5570e/include/ec/ps2.h b/src/ec/it5570e/include/ec/ps2.h
index cb75460..757f177 100644
--- a/src/ec/it5570e/include/ec/ps2.h
+++ b/src/ec/it5570e/include/ec/ps2.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_PS2_H
 #define _EC_PS2_H
 
diff --git a/src/ec/it5570e/include/ec/pwm.h b/src/ec/it5570e/include/ec/pwm.h
index 7145404..b45ae2c 100644
--- a/src/ec/it5570e/include/ec/pwm.h
+++ b/src/ec/it5570e/include/ec/pwm.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_PWM_H
 #define _EC_PWM_H
 
diff --git a/src/ec/it5570e/include/ec/smbus.h b/src/ec/it5570e/include/ec/smbus.h
index eef6592..599541b 100644
--- a/src/ec/it5570e/include/ec/smbus.h
+++ b/src/ec/it5570e/include/ec/smbus.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_SMBUS_H
 #define _EC_SMBUS_H
 
diff --git a/src/ec/it5570e/kbc.c b/src/ec/it5570e/kbc.c
index 7a3c935..9b7364f 100644
--- a/src/ec/it5570e/kbc.c
+++ b/src/ec/it5570e/kbc.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <ec/kbc.h>
 
 struct Kbc __code KBC = {
diff --git a/src/ec/it5570e/pmc.c b/src/ec/it5570e/pmc.c
index c909dac..da33000 100644
--- a/src/ec/it5570e/pmc.c
+++ b/src/ec/it5570e/pmc.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <ec/pmc.h>
 
 #define PMC(NUM) { \
diff --git a/src/ec/it5570e/ps2.c b/src/ec/it5570e/ps2.c
index d9d7465..b2c3ae7 100644
--- a/src/ec/it5570e/ps2.c
+++ b/src/ec/it5570e/ps2.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdbool.h>
 
 #include <ec/ps2.h>
diff --git a/src/ec/it5570e/signature.c b/src/ec/it5570e/signature.c
index 05ee931..274d311 100644
--- a/src/ec/it5570e/signature.c
+++ b/src/ec/it5570e/signature.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 static __code char __at(0x40) SIGNATURE[32] = {
     0xA5, 0xA5, 0xA5, 0xA5, 0xA5, 0xA5, 0xA5, 0x94,
     0x85, 0x12, 0x5A, 0x5A, 0xAA, 0x00, 0x55, 0x55,
diff --git a/src/ec/it8587e/ec.c b/src/ec/it8587e/ec.c
index cea867b..6f9b812 100644
--- a/src/ec/it8587e/ec.c
+++ b/src/ec/it8587e/ec.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <ec/ec.h>
 #include <ec/gctrl.h>
 
diff --git a/src/ec/it8587e/ec.mk b/src/ec/it8587e/ec.mk
index 1aa8151..fa1f312 100644
--- a/src/ec/it8587e/ec.mk
+++ b/src/ec/it8587e/ec.mk
@@ -1 +1,3 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
 ARCH=8051
diff --git a/src/ec/it8587e/gpio.c b/src/ec/it8587e/gpio.c
index a0118f8..fe372ef 100644
--- a/src/ec/it8587e/gpio.c
+++ b/src/ec/it8587e/gpio.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <ec/gpio.h>
 
 bool gpio_get(struct Gpio * gpio) {
diff --git a/src/ec/it8587e/i2c.c b/src/ec/it8587e/i2c.c
index cfbbdce..ebbad06 100644
--- a/src/ec/it8587e/i2c.c
+++ b/src/ec/it8587e/i2c.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdbool.h>
 
 #include <common/i2c.h>
diff --git a/src/ec/it8587e/include/ec/bram.h b/src/ec/it8587e/include/ec/bram.h
index 7b9dc53..5e63f36 100644
--- a/src/ec/it8587e/include/ec/bram.h
+++ b/src/ec/it8587e/include/ec/bram.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_BRAM_H
 #define _EC_BRAM_H
 
diff --git a/src/ec/it8587e/include/ec/dac.h b/src/ec/it8587e/include/ec/dac.h
index af02a91..f79d904 100644
--- a/src/ec/it8587e/include/ec/dac.h
+++ b/src/ec/it8587e/include/ec/dac.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_DAC_H
 #define _EC_DAC_H
 
diff --git a/src/ec/it8587e/include/ec/ec.h b/src/ec/it8587e/include/ec/ec.h
index 4a40997..0183336 100644
--- a/src/ec/it8587e/include/ec/ec.h
+++ b/src/ec/it8587e/include/ec/ec.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_EC_H
 #define _EC_EC_H
 
diff --git a/src/ec/it8587e/include/ec/ecpm.h b/src/ec/it8587e/include/ec/ecpm.h
index 7546215..605c833 100644
--- a/src/ec/it8587e/include/ec/ecpm.h
+++ b/src/ec/it8587e/include/ec/ecpm.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_ECPM_H
 #define _EC_ECPM_H
 
diff --git a/src/ec/it8587e/include/ec/etwd.h b/src/ec/it8587e/include/ec/etwd.h
index ee86635..12eac7c 100644
--- a/src/ec/it8587e/include/ec/etwd.h
+++ b/src/ec/it8587e/include/ec/etwd.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_ECWD_H
 #define _EC_ECWD_H
 
diff --git a/src/ec/it8587e/include/ec/gctrl.h b/src/ec/it8587e/include/ec/gctrl.h
index 28882c2..2f7bd99 100644
--- a/src/ec/it8587e/include/ec/gctrl.h
+++ b/src/ec/it8587e/include/ec/gctrl.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_GCTRL_H
 #define _EC_GCTRL_H
 
diff --git a/src/ec/it8587e/include/ec/gpio.h b/src/ec/it8587e/include/ec/gpio.h
index e9a1605..b4798cd 100644
--- a/src/ec/it8587e/include/ec/gpio.h
+++ b/src/ec/it8587e/include/ec/gpio.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_GPIO_H
 #define _EC_GPIO_H
 
diff --git a/src/ec/it8587e/include/ec/i2c.h b/src/ec/it8587e/include/ec/i2c.h
index ee513bc..25b0c1d 100644
--- a/src/ec/it8587e/include/ec/i2c.h
+++ b/src/ec/it8587e/include/ec/i2c.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_I2C_H
 #define _EC_I2C_H
 
diff --git a/src/ec/it8587e/include/ec/kbc.h b/src/ec/it8587e/include/ec/kbc.h
index b8bd8d9..c091a18 100644
--- a/src/ec/it8587e/include/ec/kbc.h
+++ b/src/ec/it8587e/include/ec/kbc.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_KBC_H
 #define _EC_KBC_H
 
diff --git a/src/ec/it8587e/include/ec/kbscan.h b/src/ec/it8587e/include/ec/kbscan.h
index 58dc162..180dc13 100644
--- a/src/ec/it8587e/include/ec/kbscan.h
+++ b/src/ec/it8587e/include/ec/kbscan.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_KBSCAN_H
 #define _EC_KBSCAN_H
 
diff --git a/src/ec/it8587e/include/ec/peci.h b/src/ec/it8587e/include/ec/peci.h
index acba568..6ad701d 100644
--- a/src/ec/it8587e/include/ec/peci.h
+++ b/src/ec/it8587e/include/ec/peci.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_PECI_H
 #define _EC_PECI_H
 
diff --git a/src/ec/it8587e/include/ec/pmc.h b/src/ec/it8587e/include/ec/pmc.h
index d51ef11..1397326 100644
--- a/src/ec/it8587e/include/ec/pmc.h
+++ b/src/ec/it8587e/include/ec/pmc.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_PMC_H
 #define _EC_PMC_H
 
diff --git a/src/ec/it8587e/include/ec/ps2.h b/src/ec/it8587e/include/ec/ps2.h
index cb75460..757f177 100644
--- a/src/ec/it8587e/include/ec/ps2.h
+++ b/src/ec/it8587e/include/ec/ps2.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_PS2_H
 #define _EC_PS2_H
 
diff --git a/src/ec/it8587e/include/ec/pwm.h b/src/ec/it8587e/include/ec/pwm.h
index 7145404..b45ae2c 100644
--- a/src/ec/it8587e/include/ec/pwm.h
+++ b/src/ec/it8587e/include/ec/pwm.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_PWM_H
 #define _EC_PWM_H
 
diff --git a/src/ec/it8587e/include/ec/smbus.h b/src/ec/it8587e/include/ec/smbus.h
index b47cd1c..8024ab9 100644
--- a/src/ec/it8587e/include/ec/smbus.h
+++ b/src/ec/it8587e/include/ec/smbus.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #ifndef _EC_SMBUS_H
 #define _EC_SMBUS_H
 
diff --git a/src/ec/it8587e/kbc.c b/src/ec/it8587e/kbc.c
index 7a3c935..9b7364f 100644
--- a/src/ec/it8587e/kbc.c
+++ b/src/ec/it8587e/kbc.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <ec/kbc.h>
 
 struct Kbc __code KBC = {
diff --git a/src/ec/it8587e/pmc.c b/src/ec/it8587e/pmc.c
index c909dac..da33000 100644
--- a/src/ec/it8587e/pmc.c
+++ b/src/ec/it8587e/pmc.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <ec/pmc.h>
 
 #define PMC(NUM) { \
diff --git a/src/ec/it8587e/ps2.c b/src/ec/it8587e/ps2.c
index d9d7465..b2c3ae7 100644
--- a/src/ec/it8587e/ps2.c
+++ b/src/ec/it8587e/ps2.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <stdbool.h>
 
 #include <ec/ps2.h>
diff --git a/src/ec/it8587e/signature.c b/src/ec/it8587e/signature.c
index 05ee931..274d311 100644
--- a/src/ec/it8587e/signature.c
+++ b/src/ec/it8587e/signature.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 static __code char __at(0x40) SIGNATURE[32] = {
     0xA5, 0xA5, 0xA5, 0xA5, 0xA5, 0xA5, 0xA5, 0x94,
     0x85, 0x12, 0x5A, 0x5A, 0xAA, 0x00, 0x55, 0x55,