diff options
| -rw-r--r-- | drivers/pwm/core.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index 59cc8792e312..079964961bd8 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -229,8 +229,12 @@ static int __pwm_write_waveform(struct pwm_chip *chip, struct pwm_device *pwm, c * these two calls and the waveform determined by * pwm_round_waveform_might_sleep() cannot be implemented any more. * - * Returns 0 on success, 1 if there is no valid hardware configuration matching - * the input waveform under the PWM rounding rules or a negative errno. + * Usually all values passed in @wf are rounded down to the nearest possible + * value (in the order period_length_ns, duty_length_ns and then + * duty_offset_ns). Only if this isn't possible, a value might grow. + * + * Returns 0 on success, 1 if at least one value had to be rounded up or a + * negative errno. */ int pwm_round_waveform_might_sleep(struct pwm_device *pwm, struct pwm_waveform *wf) { |