diff --git a/arch/arm/dts/ast2500-u-boot.dtsi b/arch/arm/dts/ast2500-u-boot.dtsi
index 29b08f16ac..51a5244766 100644
--- a/arch/arm/dts/ast2500-u-boot.dtsi
+++ b/arch/arm/dts/ast2500-u-boot.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <dt-bindings/clock/aspeed-clock.h>
 #include <dt-bindings/reset/ast2500-reset.h>
 
diff --git a/include/dt-bindings/clock/aspeed-clock.h b/include/dt-bindings/clock/aspeed-clock.h
index e6599deeb9..a1aa8c07ce 100644
--- a/include/dt-bindings/clock/aspeed-clock.h
+++ b/include/dt-bindings/clock/aspeed-clock.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
+// SPDX-License-Identifier: GPL-2.0
 
 #define ASPEED_CLK_GATE_ECLK		0
 #define ASPEED_CLK_GATE_GCLK		1