zl3073x_ref_is_diff
return zl3073x_ref_is_diff(ref);
is_diff = zl3073x_ref_is_diff(ref);
zl3073x_ref_is_diff(ref) ? "differential" : "single-ended");
if (zl3073x_is_n_pin(index) && zl3073x_ref_is_diff(ref - 1)) {