AD4170_AVDD_SUP
refp = st->vrefs_uv[AD4170_AVDD_SUP];
st->vrefs_uv[AD4170_AVDD_SUP] = ret;
int v_diff = st->vrefs_uv[AD4170_AVDD_SUP] - st->vrefs_uv[AD4170_AVSS_SUP];
v_diff = st->vrefs_uv[AD4170_AVDD_SUP] - st->vrefs_uv[AD4170_AVSS_SUP];