SNAFWCMR
ret = regmap_write(snand->regmap, SNAFWCMR, CMR_LEN(len));
ret = regmap_write(snand->regmap, SNAFWCMR,
ret = regmap_write(snand->regmap, SNAFWCMR,
ret = regmap_write(snand->regmap, SNAFWCMR, CMR_LEN(nbytes));