pwm_capture
struct pwm_capture result;
ret = pwm_capture(pwm, &result, jiffies_to_msecs(HZ));
static int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result,
struct pwm_capture *result, unsigned long timeout)
struct pwm_capture *result, unsigned long tmo_ms)
struct pwm_capture *result, unsigned long timeout);