Correctly spelled comments make it easier for the reader to understand
the code.

Fix typos:
'hearbeat' -> 'heartbeat',
'retrigggers' -> 'retriggers',
'funtions' -> 'functions',
'Resgister' -> 'Register'.

Signed-off-by: Yan Zhen <yanzhen@vivo.com>
---
 drivers/watchdog/pcwd.c           | 2 +-
 drivers/watchdog/rzn1_wdt.c       | 2 +-
 drivers/watchdog/smsc37b787_wdt.c | 2 +-
 drivers/watchdog/starfive-wdt.c   | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/watchdog/pcwd.c b/drivers/watchdog/pcwd.c
index a793b03a785d..c57293335d6c 100644
--- a/drivers/watchdog/pcwd.c
+++ b/drivers/watchdog/pcwd.c
@@ -835,7 +835,7 @@ static int pcwd_isa_match(struct device *dev, unsigned int id)
 			port0 = inb_p(base_addr);
 			port1 = inb_p(base_addr + 1);
 
-			/* Has either hearbeat bit changed?  */
+			/* Has either heartbeat bit changed?  */
 			if ((port0 ^ last_port0) & WD_HRTBT ||
 			    (port1 ^ last_port1) & WD_REVC_HRBT) {
 				retval = 1;
diff --git a/drivers/watchdog/rzn1_wdt.c b/drivers/watchdog/rzn1_wdt.c
index 7d3192d34afd..96fd04fbc2a2 100644
--- a/drivers/watchdog/rzn1_wdt.c
+++ b/drivers/watchdog/rzn1_wdt.c
@@ -52,7 +52,7 @@ static int rzn1_wdt_ping(struct watchdog_device *w)
 {
 	struct rzn1_watchdog *wdt = watchdog_get_drvdata(w);
 
-	/* Any value retrigggers the watchdog */
+	/* Any value retriggers the watchdog */
 	writel(0, wdt->base + RZN1_WDT_RETRIGGER);
 
 	return 0;
diff --git a/drivers/watchdog/smsc37b787_wdt.c b/drivers/watchdog/smsc37b787_wdt.c
index 7463df479d11..798562e8b92e 100644
--- a/drivers/watchdog/smsc37b787_wdt.c
+++ b/drivers/watchdog/smsc37b787_wdt.c
@@ -485,7 +485,7 @@ static long wb_smsc_wdt_ioctl(struct file *file,
 	}
 }
 
-/* -- Notifier funtions -----------------------------------------*/
+/* -- Notifier functions -----------------------------------------*/
 
 static int wb_smsc_wdt_notify_sys(struct notifier_block *this,
 					unsigned long code, void *unused)
diff --git a/drivers/watchdog/starfive-wdt.c b/drivers/watchdog/starfive-wdt.c
index 19a2620d3d38..a8b6cf767117 100644
--- a/drivers/watchdog/starfive-wdt.c
+++ b/drivers/watchdog/starfive-wdt.c
@@ -80,7 +80,7 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 		 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 
 struct starfive_wdt_variant {
-	unsigned int control;		/* Watchdog Control Resgister for reset enable */
+	unsigned int control;		/* Watchdog Control Register for reset enable */
 	unsigned int load;		/* Watchdog Load register */
 	unsigned int reload;		/* Watchdog Reload Control register */
 	unsigned int enable;		/* Watchdog Enable Register */
-- 
2.34.1