diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c
index ca3ccbe..65fd238 100644
--- a/drivers/watchdog/sp805_wdt.c
+++ b/drivers/watchdog/sp805_wdt.c
@@ -7,6 +7,7 @@
 
 #include <asm/io.h>
 #include <common.h>
+#include <clk.h>
 #include <dm/device.h>
 #include <dm/fdtaddr.h>
 #include <dm/read.h>
@@ -34,6 +35,7 @@
 
 struct sp805_wdt_priv {
 	void __iomem *reg;
+	unsigned long clk_rate;
 };
 
 static int sp805_wdt_reset(struct udevice *dev)
@@ -63,8 +65,13 @@
 	 * set 120s, the gd->bus_clk is less than 1145MHz, the load_value will
 	 * not overflow.
 	 */
-	load_value = (gd->bus_clk) /
-		(2 * 1000 * SYS_FSL_WDT_CLK_DIV) * load_time;
+	if (gd->bus_clk) {
+		load_value = (gd->bus_clk) /
+			(2 * 1000 * SYS_FSL_WDT_CLK_DIV) * load_time;
+	} else {
+		/* platform provide clk */
+		load_value = (timeout / 2) * (priv->clk_rate / 1000);
+	}
 
 	writel(UNLOCK, priv->reg + WDTLOCK);
 	writel(load_value, priv->reg + WDTLOAD);
@@ -105,11 +112,15 @@
 static int sp805_wdt_ofdata_to_platdata(struct udevice *dev)
 {
 	struct sp805_wdt_priv *priv = dev_get_priv(dev);
+	struct clk clk;
 
 	priv->reg = (void __iomem *)dev_read_addr(dev);
 	if (IS_ERR(priv->reg))
 		return PTR_ERR(priv->reg);
 
+	if (!clk_get_by_index(dev, 0, &clk))
+		priv->clk_rate = clk_get_rate(&clk);
+
 	return 0;
 }
 
diff --git a/drivers/watchdog/wdt-uclass.c b/drivers/watchdog/wdt-uclass.c
index d9e4dc7..4cdb7bd 100644
--- a/drivers/watchdog/wdt-uclass.c
+++ b/drivers/watchdog/wdt-uclass.c
@@ -14,6 +14,48 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+#define WATCHDOG_TIMEOUT_SECS	(CONFIG_WATCHDOG_TIMEOUT_MSECS / 1000)
+
+/*
+ * Reset every 1000ms, or however often is required as indicated by a
+ * hw_margin_ms property.
+ */
+static ulong reset_period = 1000;
+
+int initr_watchdog(void)
+{
+	u32 timeout = WATCHDOG_TIMEOUT_SECS;
+
+	/*
+	 * Init watchdog: This will call the probe function of the
+	 * watchdog driver, enabling the use of the device
+	 */
+	if (uclass_get_device_by_seq(UCLASS_WDT, 0,
+				     (struct udevice **)&gd->watchdog_dev)) {
+		debug("WDT:   Not found by seq!\n");
+		if (uclass_get_device(UCLASS_WDT, 0,
+				      (struct udevice **)&gd->watchdog_dev)) {
+			printf("WDT:   Not found!\n");
+			return 0;
+		}
+	}
+
+	if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
+		timeout = dev_read_u32_default(gd->watchdog_dev, "timeout-sec",
+					       WATCHDOG_TIMEOUT_SECS);
+		reset_period = dev_read_u32_default(gd->watchdog_dev,
+						    "hw_margin_ms",
+						    4 * reset_period) / 4;
+	}
+
+	wdt_start(gd->watchdog_dev, timeout * 1000, 0);
+	gd->flags |= GD_FLG_WDT_READY;
+	printf("WDT:   Started with%s servicing (%ds timeout)\n",
+	       IS_ENABLED(CONFIG_WATCHDOG) ? "" : "out", timeout);
+
+	return 0;
+}
+
 int wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
 {
 	const struct wdt_ops *ops = device_get_ops(dev);
@@ -85,7 +127,7 @@
 	/* Do not reset the watchdog too often */
 	now = get_timer(0);
 	if (time_after(now, next_reset)) {
-		next_reset = now + 1000;	/* reset every 1000ms */
+		next_reset = now + reset_period;
 		wdt_reset(gd->watchdog_dev);
 	}
 }
diff --git a/include/wdt.h b/include/wdt.h
index dd83dfd..aea5abc 100644
--- a/include/wdt.h
+++ b/include/wdt.h
@@ -106,41 +106,6 @@
 	int (*expire_now)(struct udevice *dev, ulong flags);
 };
 
-#if CONFIG_IS_ENABLED(WDT)
-#ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
-#define CONFIG_WATCHDOG_TIMEOUT_MSECS	(60 * 1000)
-#endif
-#define WATCHDOG_TIMEOUT_SECS	(CONFIG_WATCHDOG_TIMEOUT_MSECS / 1000)
-
-static inline int initr_watchdog(void)
-{
-	u32 timeout = WATCHDOG_TIMEOUT_SECS;
-
-	/*
-	 * Init watchdog: This will call the probe function of the
-	 * watchdog driver, enabling the use of the device
-	 */
-	if (uclass_get_device_by_seq(UCLASS_WDT, 0,
-				     (struct udevice **)&gd->watchdog_dev)) {
-		debug("WDT:   Not found by seq!\n");
-		if (uclass_get_device(UCLASS_WDT, 0,
-				      (struct udevice **)&gd->watchdog_dev)) {
-			printf("WDT:   Not found!\n");
-			return 0;
-		}
-	}
-
-	if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
-		timeout = dev_read_u32_default(gd->watchdog_dev, "timeout-sec",
-					       WATCHDOG_TIMEOUT_SECS);
-	}
-	wdt_start(gd->watchdog_dev, timeout * 1000, 0);
-	gd->flags |= GD_FLG_WDT_READY;
-	printf("WDT:   Started with%s servicing (%ds timeout)\n",
-	       IS_ENABLED(CONFIG_WATCHDOG) ? "" : "out", timeout);
-
-	return 0;
-}
-#endif
+int initr_watchdog(void);
 
 #endif  /* _WDT_H_ */