Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/pinctrl/consumer.h b/include/linux/pinctrl/consumer.h
index 0412cc9..7f8c7d9 100644
--- a/include/linux/pinctrl/consumer.h
+++ b/include/linux/pinctrl/consumer.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Consumer interface the pin control subsystem
  *
@@ -6,8 +7,6 @@
  * Based on bits of regulator core, gpio core and clk core
  *
  * Author: Linus Walleij <linus.walleij@linaro.org>
- *
- * License terms: GNU General Public License (GPL) version 2
  */
 #ifndef __LINUX_PINCTRL_CONSUMER_H
 #define __LINUX_PINCTRL_CONSUMER_H
@@ -25,6 +24,7 @@
 #ifdef CONFIG_PINCTRL
 
 /* External interface to pin control */
+extern bool pinctrl_gpio_can_use_line(unsigned gpio);
 extern int pinctrl_gpio_request(unsigned gpio);
 extern void pinctrl_gpio_free(unsigned gpio);
 extern int pinctrl_gpio_direction_input(unsigned gpio);
@@ -62,6 +62,11 @@
 
 #else /* !CONFIG_PINCTRL */
 
+static inline bool pinctrl_gpio_can_use_line(unsigned gpio)
+{
+	return true;
+}
+
 static inline int pinctrl_gpio_request(unsigned gpio)
 {
 	return 0;