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pwm: rcar: Document inability to set duty_cycle = 0

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When .apply() is called with state->duty_cycle = 0 the duty_ns parameter
to rcar_pwm_set_counter() is 0 which results in ph being 0 and
rcar_pwm_set_counter() returning -EINVAL.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Uwe Kleine-König 2019-10-24 09:14:10 +02:00 committed by Thierry Reding
parent bca900829d
commit af4fab8bed
1 changed files with 3 additions and 0 deletions
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3
drivers/pwm/pwm-rcar.c
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@ -3,6 +3,9 @@
* R-Car PWM Timer driver
*
* Copyright (C) 2015 Renesas Electronics Corporation
*
* Limitations:
* - The hardware cannot generate a 0% duty cycle.
*/
#include <linux/clk.h>