How many HDMI ports does my TV need to hook up PS3 via HDMI?

[Hawkeye]

I want to get a PS3, but I need to make sure it is compatible with my TV. My TV only has 1 HDMI port, and component wouln't be so great since I have 2 comp. ports which are already in use via Wii and 360. Also, I wanted upscaled PS2/DVD, which only HDMI can do.