diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index aceef0a21089..77c3f6f22ca9 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -199,8 +199,10 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc,
 	if (bank->gpio_type == GPIO_TYPE_V2 && !IS_ERR(bank->db_clk)) {
 		div_debounce_support = true;
 		freq = clk_get_rate(bank->db_clk);
+		if (!freq)
+			return -EINVAL;
 		max_debounce = (GENMASK(23, 0) + 1) * 2 * 1000000 / freq;
-		if (debounce > max_debounce)
+		if ((unsigned long)debounce > max_debounce)
 			return -EINVAL;
 
 		div = debounce * freq;