diff --git a/drivers/watchdog/ast_wdt.c b/drivers/watchdog/ast_wdt.c
index 7e11465..a21f9a4 100644
--- a/drivers/watchdog/ast_wdt.c
+++ b/drivers/watchdog/ast_wdt.c
@@ -91,8 +91,8 @@
 	struct ast_wdt_priv *priv = dev_get_priv(dev);
 
 	priv->regs = devfdt_get_addr_ptr(dev);
-	if (IS_ERR(priv->regs))
-		return PTR_ERR(priv->regs);
+	if (!priv->regs)
+		return -EINVAL;
 
 	return 0;
 }