pwm: jz4740: Implement ->set_polarity()
This permits clients of this driver to specify the polarity to use for
their PWM channel.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
index 2e41ba2..6539c00 100644
--- a/drivers/pwm/pwm-jz4740.c
+++ b/drivers/pwm/pwm-jz4740.c
@@ -130,10 +130,29 @@ static int jz4740_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
return 0;
}
+static int jz4740_pwm_set_polarity(struct pwm_chip *chip,
+ struct pwm_device *pwm, enum pwm_polarity polarity)
+{
+ uint32_t ctrl = jz4740_timer_get_ctrl(pwm->pwm);
+
+ switch (polarity) {
+ case PWM_POLARITY_NORMAL:
+ ctrl &= ~JZ_TIMER_CTRL_PWM_ACTIVE_LOW;
+ break;
+ case PWM_POLARITY_INVERSED:
+ ctrl |= JZ_TIMER_CTRL_PWM_ACTIVE_LOW;
+ break;
+ }
+
+ jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
+ return 0;
+}
+
static const struct pwm_ops jz4740_pwm_ops = {
.request = jz4740_pwm_request,
.free = jz4740_pwm_free,
.config = jz4740_pwm_config,
+ .set_polarity = jz4740_pwm_set_polarity,
.enable = jz4740_pwm_enable,
.disable = jz4740_pwm_disable,
.owner = THIS_MODULE,