QUARK_X1000_SSCR1_RxTresh
chip->threshold = (QUARK_X1000_SSCR1_RxTresh(rx_thres)
tmp = QUARK_X1000_SSCR1_RxTresh(RX_THRESH_QUARK_X1000_DFLT) |
*sccr1_reg |= QUARK_X1000_SSCR1_RxTresh(threshold);