TCU_REG_TDFRc
regmap_write(tcu->map, TCU_REG_TDFRc(channel), 0xffff);
regmap_write(tcu->map, TCU_REG_TDFRc(timer->channel), next);
regmap_write(jz->map, TCU_REG_TDFRc(pwm->hwpwm), 0x0);
regmap_write(jz->map, TCU_REG_TDFRc(pwm->hwpwm), period);