pwm: cros-ec: Refuse requests with unsupported polarity
The driver only supports normal polarity and so should refuse requests
for inversed polarity.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
diff --git a/drivers/pwm/pwm-cros-ec.c b/drivers/pwm/pwm-cros-ec.c
index d3115cb..9fffb56 100644
--- a/drivers/pwm/pwm-cros-ec.c
+++ b/drivers/pwm/pwm-cros-ec.c
@@ -124,6 +124,9 @@ static int cros_ec_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
if (state->period != EC_PWM_MAX_DUTY)
return -EINVAL;
+ if (state->polarity != PWM_POLARITY_NORMAL)
+ return -EINVAL;
+
/*
* EC doesn't separate the concept of duty cycle and enabled, but
* kernel does. Translate.
