CMR_LEN
ret = regmap_write(snand->regmap, SNAFWCMR, CMR_LEN(len));
CMR_WID(op->addr.buswidth) | CMR_LEN(len));
CMR_WID(op->dummy.buswidth) | CMR_LEN(op->dummy.nbytes));
CMR_WID(op->data.buswidth) | CMR_LEN(nbytes));
ret = regmap_write(snand->regmap, SNAFWCMR, CMR_LEN(nbytes));