[PATCH 5/5] gpio: mvebu: document zero pwm duty cycle limitation

[Baruch Siach]

Add a comment on why the code never sets the 'on' register to zero.

Reported-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
Signed-off-by: Baruch Siach <baruch at tkos.co.il>
---
 drivers/gpio/gpio-mvebu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
index eb7456fa6d86..4261e3b22b4e 100644
--- a/drivers/gpio/gpio-mvebu.c
+++ b/drivers/gpio/gpio-mvebu.c
@@ -706,6 +706,7 @@ static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	val = DIV_ROUND_UP_ULL(val, NSEC_PER_SEC);
 	if (val > UINT_MAX)
 		return -EINVAL;
+	/* zero 'on' value does not work as expected for some reason */
 	if (val)
 		on = val;
 	else
-- 
2.29.2