AD3552R_MASK_CH_DAC_POWERDOWN
*val = !field_get(AD3552R_MASK_CH_DAC_POWERDOWN(ch), tmp_val);
val = FIELD_PREP(AD3552R_MASK_CH_DAC_POWERDOWN(0), !val);
val = FIELD_PREP(AD3552R_MASK_CH_DAC_POWERDOWN(1), !val);
AD3552R_MASK_CH_DAC_POWERDOWN(chan->channel),