diff --git a/drivers/pwm/pwm-rzg2l-gpt.c b/drivers/pwm/pwm-rzg2l-gpt.c
index ac8399b96ad1..1569f3ba8c53 100644
--- a/drivers/pwm/pwm-rzg2l-gpt.c
+++ b/drivers/pwm/pwm-rzg2l-gpt.c
@@ -118,8 +118,7 @@ static void rzg2l_gpt_modify(struct rzg2l_gpt_chip *rzg2l_gpt, u32 reg, u32 clr,
 			(rzg2l_gpt_read(rzg2l_gpt, reg) & ~clr) | set);
 }
 
-static u8 rzg2l_gpt_calculate_prescale(struct rzg2l_gpt_chip *rzg2l_gpt,
-				       u64 period_ticks)
+static u8 rzg2l_gpt_calculate_prescale(u64 period_ticks)
 {
 	u32 prescaled_period_ticks;
 	u8 prescale;
@@ -286,7 +285,7 @@ static int rzg2l_gpt_config(struct pwm_chip *chip, struct pwm_device *pwm,
 		}
 	}
 
-	prescale = rzg2l_gpt_calculate_prescale(rzg2l_gpt, period_ticks);
+	prescale = rzg2l_gpt_calculate_prescale(period_ticks);
 	pv = rzg2l_gpt_calculate_pv_or_dc(period_ticks, prescale);
 
 	duty_ticks = mul_u64_u64_div_u64(state->duty_cycle, rzg2l_gpt->rate_khz, USEC_PER_SEC);