diff --git a/drivers/pwm/pwm-loongson.c b/drivers/pwm/pwm-loongson.c
index 0fb7c70e3..278325dc9 100644
--- a/drivers/pwm/pwm-loongson.c
+++ b/drivers/pwm/pwm-loongson.c
@@ -207,7 +207,7 @@ static int pwm_loongson_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 static int pwm_loongson_config(struct pwm_chip *chip, struct pwm_device *pwm,
 			       u64 duty_ns, u64 period_ns)
 {
-	u32 duty, period;
+	u64 duty, period;
 	struct pwm_loongson_ddata *ddata = to_pwm_loongson_ddata(chip);
 
 	/* duty = duty_ns * ddata->clk_rate / NSEC_PER_SEC */