diff --git a/app/boards/arm/planck/CMakeLists.txt b/app/boards/arm/planck/CMakeLists.txt
index f26de66e..6a0ec73e 100644
--- a/app/boards/arm/planck/CMakeLists.txt
+++ b/app/boards/arm/planck/CMakeLists.txt
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: Apache-2.0
+# SPDX-License-Identifier: MIT
 
 list(APPEND EXTRA_DTC_FLAGS "-qq")
 
diff --git a/app/boards/arm/planck/Kconfig.board b/app/boards/arm/planck/Kconfig.board
index 280b48f7..b744528f 100644
--- a/app/boards/arm/planck/Kconfig.board
+++ b/app/boards/arm/planck/Kconfig.board
@@ -1,7 +1,7 @@
 # STM32F3DISCOVERY board configuration
 
 # Copyright (c) 2017 I-SENSE group of ICCS
-# SPDX-License-Identifier: Apache-2.0
+# SPDX-License-Identifier: MIT
 
 config BOARD_STM32F3_DISCO
 	bool "STM32F3DISCOVERY Development Board"
diff --git a/app/boards/arm/planck/Kconfig.defconfig b/app/boards/arm/planck/Kconfig.defconfig
index 3ccd1783..855cf450 100644
--- a/app/boards/arm/planck/Kconfig.defconfig
+++ b/app/boards/arm/planck/Kconfig.defconfig
@@ -1,7 +1,7 @@
 # Planck keyboard configuration
 
 # Copyright (c) 2017 I-SENSE group of ICCS
-# SPDX-License-Identifier: Apache-2.0
+# SPDX-License-Identifier: MIT
 
 if BOARD_PLANCK_REV6
 
diff --git a/app/boards/arm/planck/board.cmake b/app/boards/arm/planck/board.cmake
index e2bdf482..4843c415 100644
--- a/app/boards/arm/planck/board.cmake
+++ b/app/boards/arm/planck/board.cmake
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: Apache-2.0
+# SPDX-License-Identifier: MIT
 
 board_runner_args(jlink "--device=STM32F303VC" "--speed=4000")
 
diff --git a/app/boards/arm/planck/pinmux.c b/app/boards/arm/planck/pinmux.c
index 76bd6d13..5df5c90e 100644
--- a/app/boards/arm/planck/pinmux.c
+++ b/app/boards/arm/planck/pinmux.c
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2017 I-SENSE group of ICCS
  *
- * SPDX-License-Identifier: Apache-2.0
+ * SPDX-License-Identifier: MIT
  */
 
 #include <kernel.h>
@@ -17,11 +17,11 @@ static const struct pin_config pinconf[] = {
 #ifdef CONFIG_UART_1
 	{STM32_PIN_PC4, STM32F3_PINMUX_FUNC_PC4_USART1_TX},
 	{STM32_PIN_PC5, STM32F3_PINMUX_FUNC_PC5_USART1_RX},
-#endif	/* CONFIG_UART_1 */
+#endif /* CONFIG_UART_1 */
 #ifdef CONFIG_UART_2
 	{STM32_PIN_PA2, STM32F3_PINMUX_FUNC_PA2_USART2_TX},
 	{STM32_PIN_PA3, STM32F3_PINMUX_FUNC_PA3_USART2_RX},
-#endif	/* CONFIG_UART_2 */
+#endif /* CONFIG_UART_2 */
 #ifdef CONFIG_I2C_1
 	{STM32_PIN_PB6, STM32F3_PINMUX_FUNC_PB6_I2C1_SCL},
 	{STM32_PIN_PB7, STM32F3_PINMUX_FUNC_PB7_I2C1_SDA},
@@ -49,7 +49,7 @@ static const struct pin_config pinconf[] = {
 #ifdef CONFIG_USB_DC_STM32
 	{STM32_PIN_PA11, STM32F3_PINMUX_FUNC_PA11_USB_DM},
 	{STM32_PIN_PA12, STM32F3_PINMUX_FUNC_PA12_USB_DP},
-#endif	/* CONFIG_USB_DC_STM32 */
+#endif /* CONFIG_USB_DC_STM32 */
 #ifdef CONFIG_CAN_1
 	{STM32_PIN_PD0, STM32F3_PINMUX_FUNC_PD0_CAN1_RX},
 	{STM32_PIN_PD1, STM32F3_PINMUX_FUNC_PD1_CAN1_TX},
@@ -66,4 +66,4 @@ static int pinmux_stm32_init(struct device *port)
 }
 
 SYS_INIT(pinmux_stm32_init, PRE_KERNEL_1,
-		CONFIG_PINMUX_STM32_DEVICE_INITIALIZATION_PRIORITY);
+		 CONFIG_PINMUX_STM32_DEVICE_INITIALIZATION_PRIORITY);
diff --git a/app/boards/arm/planck/planck_rev6.dts b/app/boards/arm/planck/planck_rev6.dts
index 58de7a44..ef23bfd8 100644
--- a/app/boards/arm/planck/planck_rev6.dts
+++ b/app/boards/arm/planck/planck_rev6.dts
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2017 I-SENSE group of ICCS
  *
- * SPDX-License-Identifier: Apache-2.0
+ * SPDX-License-Identifier: MIT
  */
 
 /dts-v1/;
diff --git a/app/boards/arm/planck/planck_rev6_defconfig b/app/boards/arm/planck/planck_rev6_defconfig
index 17330e2c..caa93604 100644
--- a/app/boards/arm/planck/planck_rev6_defconfig
+++ b/app/boards/arm/planck/planck_rev6_defconfig
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: Apache-2.0
+# SPDX-License-Identifier: MIT
 
 CONFIG_SOC_SERIES_STM32F3X=y
 CONFIG_SOC_STM32F303XC=y
diff --git a/app/boards/shields/petejohanson_handwire/Kconfig.shield b/app/boards/shields/petejohanson_handwire/Kconfig.shield
index f6e8a3fd..defb90a2 100644
--- a/app/boards/shields/petejohanson_handwire/Kconfig.shield
+++ b/app/boards/shields/petejohanson_handwire/Kconfig.shield
@@ -1,5 +1,5 @@
 # Copyright (c) 2019 Linaro Limited
-# SPDX-License-Identifier: Apache-2.0
+# SPDX-License-Identifier: MIT
 
 config SHIELD_PETEJOHANSON_HANDWIRE
 	def_bool $(shields_list_contains,petejohanson_handwire)
diff --git a/app/drivers/zephyr/dts/bindings/gpio-kscan.yaml b/app/drivers/zephyr/dts/bindings/gpio-kscan.yaml
index 0698c3ef..748d3fa1 100644
--- a/app/drivers/zephyr/dts/bindings/gpio-kscan.yaml
+++ b/app/drivers/zephyr/dts/bindings/gpio-kscan.yaml
@@ -1,5 +1,5 @@
 # Copyright (c) 2020, Pete Johanson
-# SPDX-License-Identifier: Apache-2.0
+# SPDX-License-Identifier: MIT
 
 description: GPIO keyboard matrix controller
 
@@ -8,18 +8,18 @@ compatible: "gpio-kscan"
 include: kscan.yaml
 
 properties:
-    row-gpios:
-        type: phandle-array
-        required: true
-    col-gpios:
-        type: phandle-array
-        required: true
-    debounce-period:
-        type: int
-        default: 5
-    diode-direction:
-        type: string
-        default: row2col
-        enum:
-          - row2col
-          - col2row
+  row-gpios:
+    type: phandle-array
+    required: true
+  col-gpios:
+    type: phandle-array
+    required: true
+  debounce-period:
+    type: int
+    default: 5
+  diode-direction:
+    type: string
+    default: row2col
+    enum:
+      - row2col
+      - col2row
diff --git a/app/drivers/zephyr/kscan_gpio.c b/app/drivers/zephyr/kscan_gpio.c
index a53e2f91..76606d8b 100644
--- a/app/drivers/zephyr/kscan_gpio.c
+++ b/app/drivers/zephyr/kscan_gpio.c
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2020 Peter Johanson <peter@peterjohanson.com>
  *
- * SPDX-License-Identifier: Apache-2.0
+ * SPDX-License-Identifier: MIT
  */
 
 #define DT_DRV_COMPAT gpio_kscan