From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH 7/8] led: pwm: support active-low property
Date: Thu, 6 Feb 2020 12:23:33 +0100 [thread overview]
Message-ID: <20200206112334.14314-8-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20200206112334.14314-1-a.fatoum@pengutronix.de>
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>
---
drivers/led/led-pwm.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/led/led-pwm.c b/drivers/led/led-pwm.c
index 419d96eed392..8a358dde88b3 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;
--
2.25.0
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next prev parent reply other threads:[~2020-02-06 11:23 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-06 11:23 [PATCH 0/8] PWM: misc fixes Ahmad Fatoum
2020-02-06 11:23 ` [PATCH 1/8] PWM: pxa: remove unused struct members Ahmad Fatoum
2020-02-06 11:23 ` [PATCH 2/8] PWM: pxa: make MMIO writes always little endian Ahmad Fatoum
2020-02-06 11:23 ` [PATCH 3/8] regmap: forward declare structs used in header Ahmad Fatoum
2020-02-06 11:23 ` [PATCH 4/8] video: backlight-pwm: remove duplicate assignment to object Ahmad Fatoum
2020-02-06 11:23 ` [PATCH 5/8] led: pwm: don't test if pointer is smaller than zero Ahmad Fatoum
2020-02-06 11:23 ` [PATCH 6/8] led: pwm: fail if required max-brightness option is missing Ahmad Fatoum
2020-02-06 11:23 ` Ahmad Fatoum [this message]
2020-02-06 11:23 ` [PATCH 8/8] PWM: core: constify chip->ops pointer Ahmad Fatoum
2020-02-10 8:16 ` [PATCH 0/8] PWM: misc fixes Sascha Hauer
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