via_set_source
via_set_source(viaparinfo->shared->iga1_devices, IGA1);
via_set_source(viaparinfo->shared->iga2_devices, IGA2);
void via_set_source(u32 devices, u8 iga);
via_set_source(dev_new, IGA1);
via_set_source(dev_new, IGA2);