AD4170_AFE_PGA_GAIN_MSK
pga = FIELD_GET(AD4170_AFE_PGA_GAIN_MSK, setup->afe);
pga = FIELD_GET(AD4170_AFE_PGA_GAIN_MSK, setup->afe);
setup->afe &= ~AD4170_AFE_PGA_GAIN_MSK;
setup->afe |= FIELD_PREP(AD4170_AFE_PGA_GAIN_MSK, pga);