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| author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2020-02-06 12:23:33 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2020-02-10 09:16:15 +0100 |
| commit | 769eb5e7bbb21199611cec2519a47447375cc57a (patch) | |
| tree | 17e7bdc1bfa0ecde2c03e1c1bd6d0fb00e9db7ce /drivers | |
| parent | f2fae1be3aa51e9665b4b947f7f0f4f723e264d6 (diff) | |
| download | barebox-769eb5e7bbb21199611cec2519a47447375cc57a.tar.gz barebox-769eb5e7bbb21199611cec2519a47447375cc57a.tar.xz | |
led: pwm: support active-low property
active-low is an optional property to describe PWMs where the LED is wired
to supply rather than ground. Add barebox support for it.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/led/led-pwm.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/led/led-pwm.c b/drivers/led/led-pwm.c index 419d96eed3..8a358dde88 100644 --- a/drivers/led/led-pwm.c +++ b/drivers/led/led-pwm.c @@ -41,6 +41,9 @@ static void led_pwm_set(struct led *led, unsigned int brightness) duty *= brightness; do_div(duty, max); + if (pwmled->active_low) + duty = pwmled->period - duty; + pwm_config(pwmled->pwm, duty, pwmled->period); } @@ -66,6 +69,7 @@ static int led_pwm_of_probe(struct device_d *dev) return ret; pwmled->period = pwm_get_period(pwmled->pwm); + pwmled->active_low = of_property_read_bool(child, "active-low"); pwmled->led.set = led_pwm_set; |