SP7021_PWM_FREQ_SCALER
state->period = DIV64_U64_ROUND_UP((u64)dd_freq * (u64)SP7021_PWM_FREQ_SCALER
if (clk_rate > (u64)SP7021_PWM_FREQ_SCALER * NSEC_PER_SEC)
dd_freq = mul_u64_u64_div_u64(clk_rate, state->period, (u64)SP7021_PWM_FREQ_SCALER