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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>
hifive-unleashed-5.1
Paul Cercueil 2018-01-06 17:58:41 +01:00 committed by Thierry Reding
parent df56b1712d
commit 174dcc8eae
1 changed files with 19 additions and 0 deletions
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19
drivers/pwm/pwm-jz4740.c
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@ -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,