Standard tuning, I believe. From what my quick glance can tell, he's just messing around with 7th and 9th chords.

Martin DSR
Taylor 214e
Fender Strat
Epiphone 335 Dot
Carlo Robelli Acoustic

1978 Fender Pro Reverb
Boss Blues Driver
Boss Super Overdrive
EHX Holy Grail
Boss DD-20 Giga Delay
its half step down aka HENDRIX TUNING(the BEST tuning)
i could play like eric clapton if i had his gear...anyone could