diff --git a/drivers/watchdog/stm32_iwdg.c b/drivers/watchdog/stm32_iwdg.c
index b356a272ff9a..a8d2db2d3cf8 100644
--- a/drivers/watchdog/stm32_iwdg.c
+++ b/drivers/watchdog/stm32_iwdg.c
@@ -287,8 +287,11 @@ static int stm32_iwdg_irq_init(struct platform_device *pdev,
 		return 0;
 
 	irq = platform_get_irq_optional(pdev, 0);
-	if (irq <= 0)
+	if (irq < 0) {
+		if (irq != -ENXIO)
+			return irq;
 		return 0;
+	}
 
 	if (of_property_read_bool(np, "wakeup-source")) {
 		ret = devm_device_init_wakeup(dev);