6 files changed, 29 insertions, 0 deletions
diff --git a/arch/sandbox/dts/overlay0.dts b/arch/sandbox/dts/overlay0.dts
index 70c6cf77aa..9e5f38962b 100644
--- a/arch/sandbox/dts/overlay0.dts
+++ b/arch/sandbox/dts/overlay0.dts
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Overlay test file
+ */
+
 /dts-v1/;
 /plugin/;
 
diff --git a/arch/sandbox/dts/overlay1.dts b/arch/sandbox/dts/overlay1.dts
index 51621b3110..303e713f33 100644
--- a/arch/sandbox/dts/overlay1.dts
+++ b/arch/sandbox/dts/overlay1.dts
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Overlay test file
+ */
+
 /dts-v1/;
 /plugin/;
 
diff --git a/arch/sandbox/dts/sandbox.dts b/arch/sandbox/dts/sandbox.dts
index a8938a3acc..127f168f02 100644
--- a/arch/sandbox/dts/sandbox.dts
+++ b/arch/sandbox/dts/sandbox.dts
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Main sandbox devicetree
+ */
+
 /dts-v1/;
 
 #include <config.h>
diff --git a/arch/sandbox/dts/sandbox.dtsi b/arch/sandbox/dts/sandbox.dtsi
index 200fcab6a4..6cf5f14cd1 100644
--- a/arch/sandbox/dts/sandbox.dtsi
+++ b/arch/sandbox/dts/sandbox.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * This is the common sandbox device-tree nodes. This is shared between sandbox
  * and sandbox64 builds.
diff --git a/arch/sandbox/dts/sandbox64.dts b/arch/sandbox/dts/sandbox64.dts
index a39f94feec..ec53106af9 100644
--- a/arch/sandbox/dts/sandbox64.dts
+++ b/arch/sandbox/dts/sandbox64.dts
@@ -1,3 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Main sandbox64 devicetree
+ */
 /dts-v1/;
 
 #include <config.h>
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 1399a14929..b36447c4a7 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -1,3 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Devicetree file for running sandbox tests
+ *
+ * This includes lots of extra devices used by various tests.
+ *
+ * Note that SPL use the main sandbox.dts file
+ */
+
 /dts-v1/;
 
 #include <dt-bindings/gpio/gpio.h>