Paul does not specifically reference speaking in tongues in Ephesians but that does not change what he points out in another epistle. Paul makes it clear that those speaking in an unknown tongue are speaking to God. He also mentions praying and singing in the spirit as well as his regular language. All of these are ways the Holy Ghost edifies His children.
Paul was clear in Ephesians and note....the church at Ephesus was not carnal, immature and sporting some 15 errors like the Corinthian church was........he states clearly what evidences are found in one that is being continually filled with the Spirit and tongues was not listed....take it up with God.......