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authorPaul Cercueil <paul@crapouillou.net>2018-01-06 17:58:41 +0100
committerThierry Reding <thierry.reding@gmail.com>2018-03-28 00:23:45 +0200
commit174dcc8eaec5fd53f9d6f3aa3068e8415a9c0d35 (patch)
tree00a206dff271a6908fc3ea13c43bf776a4c61bbe /drivers/pwm/pwm-jz4740.c
parentpwm: jz4740: Make disable operation compatible with TCU2 mode (diff)
downloadlinux-174dcc8eaec5fd53f9d6f3aa3068e8415a9c0d35.tar.xz
linux-174dcc8eaec5fd53f9d6f3aa3068e8415a9c0d35.zip
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.c19
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,