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| author | Paul Cercueil <paul@crapouillou.net> | 2018-01-06 17:58:41 +0100 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2018-03-28 00:23:45 +0200 |
| commit | 174dcc8eaec5fd53f9d6f3aa3068e8415a9c0d35 (patch) | |
| tree | 00a206dff271a6908fc3ea13c43bf776a4c61bbe /drivers/pwm/pwm-jz4740.c | |
| parent | df56b1712d57863e9686673bb13803dcd8a82f7a (diff) | |
| download | linux-174dcc8eaec5fd53f9d6f3aa3068e8415a9c0d35.tar.bz2 | |
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>
Diffstat (limited to 'drivers/pwm/pwm-jz4740.c')
| -rw-r--r-- | drivers/pwm/pwm-jz4740.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c index 2e41ba213f39..6539c001fe32 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, |