diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c
index ceca42db08374..d404953d0e0f4 100644
--- a/drivers/watchdog/rzg2l_wdt.c
+++ b/drivers/watchdog/rzg2l_wdt.c
@@ -8,6 +8,7 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
@@ -35,6 +36,8 @@
 
 #define F2CYCLE_NSEC(f)			(1000000000 / (f))
 
+#define RZV2M_A_NSEC			730
+
 static bool nowayout = WATCHDOG_NOWAYOUT;
 module_param(nowayout, bool, 0);
 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
@@ -51,11 +54,35 @@ struct rzg2l_wdt_priv {
 	struct reset_control *rstc;
 	unsigned long osc_clk_rate;
 	unsigned long delay;
+	unsigned long minimum_assertion_period;
 	struct clk *pclk;
 	struct clk *osc_clk;
 	enum rz_wdt_type devtype;
 };
 
+static int rzg2l_wdt_reset(struct rzg2l_wdt_priv *priv)
+{
+	int err, status;
+
+	if (priv->devtype == WDT_RZV2M) {
+		/* WDT needs TYPE-B reset control */
+		err = reset_control_assert(priv->rstc);
+		if (err)
+			return err;
+		ndelay(priv->minimum_assertion_period);
+		err = reset_control_deassert(priv->rstc);
+		if (err)
+			return err;
+		err = read_poll_timeout(reset_control_status, status,
+					status != 1, 0, 1000, false,
+					priv->rstc);
+	} else {
+		err = reset_control_reset(priv->rstc);
+	}
+
+	return err;
+}
+
 static void rzg2l_wdt_wait_delay(struct rzg2l_wdt_priv *priv)
 {
 	/* delay timer when change the setting register */
@@ -115,7 +142,7 @@ static int rzg2l_wdt_stop(struct watchdog_device *wdev)
 {
 	struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
 
-	reset_control_reset(priv->rstc);
+	rzg2l_wdt_reset(priv);
 	pm_runtime_put(wdev->parent);
 
 	return 0;
@@ -154,6 +181,7 @@ static int rzg2l_wdt_restart(struct watchdog_device *wdev,
 		rzg2l_wdt_write(priv, PEEN_FORCE, PEEN);
 	} else {
 		/* RZ/V2M doesn't have parity error registers */
+		rzg2l_wdt_reset(priv);
 
 		wdev->timeout = 0;
 
@@ -251,6 +279,13 @@ static int rzg2l_wdt_probe(struct platform_device *pdev)
 
 	priv->devtype = (uintptr_t)of_device_get_match_data(dev);
 
+	if (priv->devtype == WDT_RZV2M) {
+		priv->minimum_assertion_period = RZV2M_A_NSEC +
+			3 * F2CYCLE_NSEC(pclk_rate) + 5 *
+			max(F2CYCLE_NSEC(priv->osc_clk_rate),
+			    F2CYCLE_NSEC(pclk_rate));
+	}
+
 	pm_runtime_enable(&pdev->dev);
 
 	priv->wdev.info = &rzg2l_wdt_ident;