diff --git a/arch/sandbox/include/asm/serial.h b/arch/sandbox/include/asm/serial.h
new file mode 100644
index 0000000000..bc82aebd0e
--- /dev/null
+++ b/arch/sandbox/include/asm/serial.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2020 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#ifndef __asm_serial_h
+#define __asm_serial_h
+
+#include <dt-structs.h>
+
+struct sandbox_serial_plat {
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+	struct dtd_sandbox_serial dtplat;
+#endif
+	int colour;	/* Text colour to use for output, -1 for none */
+};
+
+/**
+ * struct sandbox_serial_priv - Private data for this driver
+ *
+ * @buf: holds input characters available to be read by this driver
+ */
+struct sandbox_serial_priv {
+	struct membuff buf;
+	char serial_buf[16];
+	bool start_of_line;
+};
+
+#endif /* __asm_serial_h */
diff --git a/drivers/serial/sandbox.c b/drivers/serial/sandbox.c
index a05c56458b..19368ba256 100644
--- a/drivers/serial/sandbox.c
+++ b/drivers/serial/sandbox.c
@@ -17,25 +17,11 @@
 #include <serial.h>
 #include <video.h>
 #include <linux/compiler.h>
+#include <asm/serial.h>
 #include <asm/state.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
-struct sandbox_serial_plat {
-	int colour;	/* Text colour to use for output, -1 for none */
-};
-
-/**
- * struct sandbox_serial_priv - Private data for this driver
- *
- * @buf: holds input characters available to be read by this driver
- */
-struct sandbox_serial_priv {
-	struct membuff buf;
-	char serial_buf[16];
-	bool start_of_line;
-};
-
 /**
  * output_ansi_colour() - Output an ANSI colour code
  *