Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/dt-bindings/clock/ath79-clk.h b/include/dt-bindings/clock/ath79-clk.h
index 27359ad..eec8f39 100644
--- a/include/dt-bindings/clock/ath79-clk.h
+++ b/include/dt-bindings/clock/ath79-clk.h
@@ -1,10 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Copyright (C) 2014, 2016 Antony Pavlov <antonynpavlov@gmail.com>
- *
- * 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.
- *
  */
 
 #ifndef __DT_BINDINGS_ATH79_CLK_H
@@ -13,7 +9,9 @@
 #define ATH79_CLK_CPU		0
 #define ATH79_CLK_DDR		1
 #define ATH79_CLK_AHB		2
+#define ATH79_CLK_REF		3
+#define ATH79_CLK_MDIO		4
 
-#define ATH79_CLK_END		3
+#define ATH79_CLK_END		5
 
 #endif /* __DT_BINDINGS_ATH79_CLK_H */