rockchip: pwm: implement pwm_set_invert()

Rockchip pwm need to init polarity, implement pwm_set_invert()
to do it.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/pwm/rk_pwm.c b/drivers/pwm/rk_pwm.c
index 9254f5bc3975262dfb71ae487b3572e41698403b..f3b2f7615d2cd5a847ee707f062ac3768a0747e1 100644 (file)
--- a/drivers/pwm/rk_pwm.c
+++ b/drivers/pwm/rk_pwm.c
@@ -21,8 +21,22 @@ DECLARE_GLOBAL_DATA_PTR;
 struct rk_pwm_priv {
        struct rk3288_pwm *regs;
        ulong freq;
+       uint enable_conf;
 };
 
+static int rk_pwm_set_invert(struct udevice *dev, uint channel, bool polarity)
+{
+       struct rk_pwm_priv *priv = dev_get_priv(dev);
+
+       debug("%s: polarity=%u\n", __func__, polarity);
+       if (polarity)
+               priv->enable_conf |= PWM_DUTY_NEGATIVE | PWM_INACTIVE_POSTIVE;
+       else
+               priv->enable_conf |= PWM_DUTY_POSTIVE | PWM_INACTIVE_NEGATIVE;
+
+       return 0;
+}
+
 static int rk_pwm_set_config(struct udevice *dev, uint channel, uint period_ns,
                             uint duty_ns)
 {
@@ -32,7 +46,7 @@ static int rk_pwm_set_config(struct udevice *dev, uint channel, uint period_ns,
 
        debug("%s: period_ns=%u, duty_ns=%u\n", __func__, period_ns, duty_ns);
        writel(PWM_SEL_SRC_CLK | PWM_OUTPUT_LEFT | PWM_LP_DISABLE |
-               PWM_CONTINUOUS | PWM_DUTY_POSTIVE | PWM_INACTIVE_POSTIVE |
+               PWM_CONTINUOUS | priv->enable_conf |
                RK_PWM_DISABLE,
                &regs->ctrl);
 
@@ -83,6 +97,7 @@ static int rk_pwm_probe(struct udevice *dev)
 }
 
 static const struct pwm_ops rk_pwm_ops = {
+       .set_invert     = rk_pwm_set_invert,
        .set_config     = rk_pwm_set_config,
        .set_enable     = rk_pwm_set_enable,
 };