The duty cycles value goes from 1 (99% HIGH) to 256 (0% HIGH) but it
is stored modulo 256 in the register as it is only 8 bits wide.
Signed-off-by: Alban Bedel <alban.be...@avionic-design.de>
---
drivers/pwm/pwm-lpc32xx.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/pwm/pwm-lpc32xx.c b/drivers/pwm/pwm-lpc32xx.c
index adb87f0..2590f8d 100644
--- a/drivers/pwm/pwm-lpc32xx.c
+++ b/drivers/pwm/pwm-lpc32xx.c
@@ -51,7 +51,9 @@ static int lpc32xx_pwm_config(struct pwm_chip *chip, struct
pwm_device *pwm,
c = 256 * duty_ns;
do_div(c, period_ns);
- duty_cycles = c;
+ if (c > 255)
+ c = 255;
+ duty_cycles = 256 - c;
writel(PWM_ENABLE | PWM_RELOADV(period_cycles) | PWM_DUTY(duty_cycles),
lpc32xx->base + (pwm->hwpwm << 2));
--
1.7.0.4
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