Partner opened one diamond. I responded 1 NT with the following hand.
♠Txxx ♥Axx ♦Txxx ♣Ax
Partner then rebid two spades. I raised to four spades, reading my partner for 17 points or so. We went down two because he only had 13.
I said, "I read you for 17 points because you "reversed" (bid a higher-ranking suit at a higher level with the second bid).
Partner answered, "I was just bidding my 5-4 pattern. It said nothing about extra strength."
Did partner, in fact, "reverse"? Does it require about 17 points to do so? And if so, did it make sense for me to raise to four spades (I counted "eight" HCP, plus something extra for the club doubleton, and the two tens, located strategically in his suits).