Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/clkdev.h b/include/linux/clkdev.h
index 4890ff0..fd06b27 100644
--- a/include/linux/clkdev.h
+++ b/include/linux/clkdev.h
@@ -1,12 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  *  include/linux/clkdev.h
  *
  *  Copyright (C) 2008 Russell King.
  *
- * 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.
- *
  * Helper for the clk API to assist looking up a struct clk.
  */
 #ifndef __CLKDEV_H
@@ -52,4 +49,8 @@
 int clk_register_clkdev(struct clk *, const char *, const char *);
 int clk_hw_register_clkdev(struct clk_hw *, const char *, const char *);
 
+int devm_clk_hw_register_clkdev(struct device *dev, struct clk_hw *hw,
+				const char *con_id, const char *dev_id);
+void devm_clk_release_clkdev(struct device *dev, const char *con_id,
+			     const char *dev_id);
 #endif