XADC_REG_VREFN
.sign = ((_addr) == XADC_REG_VREFN) ? 's' : 'u', \
XADC_7S_CHAN_VOLTAGE(7, 13, XADC_REG_VREFN, "vrefn", false),
XADC_US_CHAN_VOLTAGE(7, 13, XADC_REG_VREFN, "vrefn", false),
return XADC_REG_VREFN;
case XADC_REG_VREFN: