[U-Boot] [PATCH 1/1] video: backlight: Parse PWM polarity cell
Stefan Mavrodiev
stefan at olimex.com
Mon Mar 25 07:53:48 UTC 2019
This patch enables the reading of the polarity cell from a PWM
phandle and calls pwm_set_invert().
---
drivers/video/pwm_backlight.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/video/pwm_backlight.c b/drivers/video/pwm_backlight.c
index bd733f5f1c..0a08a76af1 100644
--- a/drivers/video/pwm_backlight.c
+++ b/drivers/video/pwm_backlight.c
@@ -39,6 +39,12 @@ struct pwm_backlight_priv {
struct udevice *pwm;
uint channel;
uint period_ns;
+ /*
+ * the polarity of one PWM
+ * 0: normal polarity
+ * 1: inverted polarity
+ */
+ bool polarity;
u32 *levels;
int num_levels;
uint default_level;
@@ -57,7 +63,10 @@ static int set_pwm(struct pwm_backlight_priv *priv)
(priv->max_level - priv->min_level + 1);
ret = pwm_set_config(priv->pwm, priv->channel, priv->period_ns,
duty_cycle);
+ if (ret)
+ return log_ret(ret);
+ ret = pwm_set_invert(priv->pwm, priv->channel, priv->polarity);
return log_ret(ret);
}
@@ -202,6 +211,7 @@ static int pwm_backlight_ofdata_to_platdata(struct udevice *dev)
return log_msg_ret("Not enough arguments to pwm\n", -EINVAL);
priv->channel = args.args[0];
priv->period_ns = args.args[1];
+ priv->polarity = args.args[2];
index = dev_read_u32_default(dev, "default-brightness-level", 255);
cell = dev_read_prop(dev, "brightness-levels", &len);
--
2.17.1
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