J.J. Cale/Eric Clapton “Cocaine” guitar instruction

J.J. Cale’s “Cocaine” is a very easy song to play on guitar. It basically moves back and forth between an E and D chord with an open low E string ringing out. Eric Clapton plays this at the 7th and 5th fret. At the end of the chorus the chord progression walks down from E-D-C-B at the 7th, 5th, 3rd and 2nd fret also with the low E ringing out.