UDC_EPIN_IDX
ep = &dev->ep[UDC_EPIN_IDX(ep_num)];
struct pch_udc_ep *ep = &dev->ep[UDC_EPIN_IDX(ep_num)];
ep = &dev->ep[UDC_EPIN_IDX(i)];
pch_udc_write_csr(ep->dev, val, UDC_EPIN_IDX(ep->num));