fsl_pwm_calculate_period_clk
ret = fsl_pwm_calculate_period_clk(fpc, period_ns, FSL_PWM_CLK_SYS,
ret = fsl_pwm_calculate_period_clk(fpc, period_ns, m0, periodcfg);
return fsl_pwm_calculate_period_clk(fpc, period_ns, m1, periodcfg);