diff --git a/arch/sandbox/dts/cros-ec-keyboard.dtsi b/arch/sandbox/dts/cros-ec-keyboard.dtsi
index 9c7fb0a..d885a5e 100644
--- a/arch/sandbox/dts/cros-ec-keyboard.dtsi
+++ b/arch/sandbox/dts/cros-ec-keyboard.dtsi
@@ -1,12 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Keyboard dts fragment for devices that use cros-ec-keyboard
  *
  * Copyright (c) 2014 Google, Inc
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
-*/
+ * This file is taken from Linux
+ * arch/arm/boot/dts/cros-ec-keyboard.dtsi.
+ *
+ * A duplicate KEY_BACKSLASH key had to be removed.
+ */
 
 #include <dt-bindings/input/input.h>
 
@@ -22,6 +24,7 @@
 			MATRIX_KEY(0x00, 0x02, KEY_F1)
 			MATRIX_KEY(0x00, 0x03, KEY_B)
 			MATRIX_KEY(0x00, 0x04, KEY_F10)
+			MATRIX_KEY(0x00, 0x05, KEY_RO)
 			MATRIX_KEY(0x00, 0x06, KEY_N)
 			MATRIX_KEY(0x00, 0x08, KEY_EQUAL)
 			MATRIX_KEY(0x00, 0x0a, KEY_RIGHTALT)
@@ -34,6 +37,7 @@
 			MATRIX_KEY(0x01, 0x08, KEY_APOSTROPHE)
 			MATRIX_KEY(0x01, 0x09, KEY_F9)
 			MATRIX_KEY(0x01, 0x0b, KEY_BACKSPACE)
+			MATRIX_KEY(0x01, 0x0c, KEY_HENKAN)
 
 			MATRIX_KEY(0x02, 0x00, KEY_LEFTCTRL)
 			MATRIX_KEY(0x02, 0x01, KEY_TAB)
@@ -45,6 +49,7 @@
 			MATRIX_KEY(0x02, 0x07, KEY_102ND)
 			MATRIX_KEY(0x02, 0x08, KEY_LEFTBRACE)
 			MATRIX_KEY(0x02, 0x09, KEY_F8)
+			MATRIX_KEY(0x02, 0x0a, KEY_YEN)
 
 			MATRIX_KEY(0x03, 0x01, KEY_GRAVE)
 			MATRIX_KEY(0x03, 0x02, KEY_F2)
@@ -52,7 +57,9 @@
 			MATRIX_KEY(0x03, 0x04, KEY_F5)
 			MATRIX_KEY(0x03, 0x06, KEY_6)
 			MATRIX_KEY(0x03, 0x08, KEY_MINUS)
+			MATRIX_KEY(0x03, 0x09, KEY_F13)
 			MATRIX_KEY(0x03, 0x0b, KEY_BACKSLASH)
+			MATRIX_KEY(0x03, 0x0c, KEY_MUHENKAN)
 
 			MATRIX_KEY(0x04, 0x00, KEY_RIGHTCTRL)
 			MATRIX_KEY(0x04, 0x01, KEY_A)
@@ -63,7 +70,10 @@
 			MATRIX_KEY(0x04, 0x06, KEY_J)
 			MATRIX_KEY(0x04, 0x08, KEY_SEMICOLON)
 			MATRIX_KEY(0x04, 0x09, KEY_L)
-			MATRIX_KEY(0x04, 0x0a, KEY_BACKSLASH)
+			/*
+			 * Do not map any key twice
+			 * MATRIX_KEY(0x04, 0x0a, KEY_BACKSLASH)
+			 */
 			MATRIX_KEY(0x04, 0x0b, KEY_ENTER)
 
 			MATRIX_KEY(0x05, 0x01, KEY_Z)