IFR aircraft cleared direct to DEHYY for the RNAV (GPS) Runway 28 approach to BJJ was questioned by ATC when a procedure turn was initiated; absent other direction/s; claiming chart required same.

Narrative

The flight was a short IFR reposition flight from CAK to BJJ. My clearance was runway heading to 3;000 direct to BJJ (as filed). Departure Control; after radar contact; cleared me direct to DEHYY; which is the IF/IAF for the RNAV (GPS) Runway 28. His instructions were 'cleared direct to DEHYY; maintain 3;000 until established; cleared for the GPS Runway 28.' So I proceeded direct to DEHYY and started the procedure turn as required by the approach chart. On the turn outbound; departure called me and asked 'are you headed eastbound?' which I said 'yes; as required by the approach chart with DEHYY as the IF.' The next contact was inbound and approach asked if I was established inbound to which I responded 'yes.' When handing me off to CTAF; I asked if I could call (phone) to cancel my IFR and he said that would be fine because he would like to talk to me anyhow. I called on the ground and he asked why I thought I had to do a procedure turn on that approach? I answered because that is what is charted when at 3;000 within 8 miles of DEHYY as the IF. I am still under the impression that if I am at 3;000 feet with DEHYY as my IF for the full approach; I am required to do a procedure turn unless instructed by ATC to do so otherwise. For instance if he had said 'cleared for the 'straight-in' GPS 28 approach;' then I would not have done the procedure turn; but he didn't say that. His clearance was 'cleared for GPS 28 Wayne County.' I was never told not to do the procedure turn and it is charted as part of the approach. I understand which fixes the procedure turn is not authorized (GIMMU and EBEKY). He said that if I came up here again (CAK) and tried to do that procedure turn he would violate me and I could sort it out with the FSDO. He said of all the airplanes he clears for that approach; I am the only one who has ever done the procedure turn from DEHYY.