HC_SCRATCH
[HC_SCRATCH] = REG_FIELD(ISP176x_HC_SCRATCH, 0, 31),
[HC_SCRATCH] = REG_FIELD(ISP1763_HC_SCRATCH, 0, 15),
isp1760_hcd_write(hcd, HC_SCRATCH, pattern);
scratch = isp1760_hcd_read(hcd, HC_SCRATCH);