NPCM_I2CST_NMATCH
if (NPCM_I2CST_NMATCH & i2cst) {
iowrite8(NPCM_I2CST_NMATCH, bus->reg + NPCM_I2CST);
iowrite8(NPCM_I2CST_NMATCH, bus->reg + NPCM_I2CST);
if (FIELD_GET(NPCM_I2CST_NMATCH, i2cst)) {