Which Rabbi Yishmael?

In the ninth mishnah in Perek IV, Rabbi Yishmael has some harsh things to say about over-enthusiastic judges.  There seems to be a consensus that the Rabbi Yishmael in question is the son of Rabbi Yose ben Chalafta -- the author of the previous mishnah.  However, I'm sure that many years ago I spotted an opinion that this was not so, and that the Rabbi Yishmael in question was the son of Rabbi Yochanan ben Beroka.

If any reader has seen this opinion, can they please point me in its direction? Thanks!