sandbox: Add license headers to the dts files
Many of these files are missing a header. Fix this.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/sandbox/dts/overlay0.dts b/arch/sandbox/dts/overlay0.dts
index 70c6cf7..9e5f389 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 51621b3..303e713 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 a8938a3..127f168 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 200fcab..6cf5f14 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 a39f94f..ec53106 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 1399a14..b36447c 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>