BQ27XXX_DM_CKSUM
ret = bq27xxx_read(di, BQ27XXX_DM_CKSUM, true);
[BQ27XXX_DM_CKSUM] = 0x60
ret = bq27xxx_write(di, BQ27XXX_DM_CKSUM,
[BQ27XXX_DM_CKSUM] = INVALID_REG_ADDR,
[BQ27XXX_DM_CKSUM] = INVALID_REG_ADDR,
[BQ27XXX_DM_CKSUM] = INVALID_REG_ADDR,