pwm: rcar: Improve accuracy of frequency division setting

From: Ryo Kodama <ryo.kodama.vz@renesas.com>

When period_ns is set to the same value of RCAR_PWM_MAX_CYCLE in
rcar_pwm_get_clock_division(), this function should allow such value
for improving accuracy of frequency division setting.
Signed-off-by: Ryo Kodama <ryo.kodama.vz@renesas.com>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-rcar.c

@@ -81,7 +81,7 @@ static int rcar_pwm_get_clock_division(struct rcar_pwm_chip *rp, int period_ns)
 		max = (unsigned long long)NSEC_PER_SEC * RCAR_PWM_MAX_CYCLE *
 			(1 << div);
 		do_div(max, clk_rate);
-		if (period_ns < max)
+		if (period_ns <= max)
 			break;
 	}