Set inversed polarity when .pwm_active_low is set in the platform_data. With
device tree, this is taken care of by of_pwm_xlate_with_flags(), called from
of_pwm_get().
Signed-off-by: Alexandre Belloni <alexandre.bell...@free-electrons.com>
---
drivers/video/backlight/pwm_bl.c | 8 ++++++++
include/linux/pwm_backlight.h | 1 +
2 files changed, 9 insertions(+)
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index b75201ff46f6..ffdd3b2b2742 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -309,6 +309,14 @@ static int pwm_backlight_probe(struct platform_device
*pdev)
if (data->pwm_period_ns > 0)
pwm_set_period(pb->pwm, data->pwm_period_ns);
+ /*
+ * The DT case is taking care of polarity in of_pwm_get(). For the
+ * non-DT case, set the polarity from platform data.
+ */
+ if (data->pwm_active_low)
+ if (pwm_set_polarity(pb->pwm, PWM_POLARITY_INVERSED))
+ dev_err(&pdev->dev, "impossible to invert polarity\n");
+
pb->period = pwm_get_period(pb->pwm);
pb->lth_brightness = data->lth_brightness * (pb->period / pb->scale);
diff --git a/include/linux/pwm_backlight.h b/include/linux/pwm_backlight.h
index 2de2e275b2cb..b924fce5c97a 100644
--- a/include/linux/pwm_backlight.h
+++ b/include/linux/pwm_backlight.h
@@ -15,6 +15,7 @@ struct platform_pwm_backlight_data {
unsigned int dft_brightness;
unsigned int lth_brightness;
unsigned int pwm_period_ns;
+ bool pwm_active_low;
unsigned int *levels;
int enable_gpio;
unsigned long enable_gpio_flags;
--
1.8.3.2
--
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