I have a Raspberry Pi 2 B+ and I would like to confirm that the 3.5mm jack isn't tied to a GPIO pin. I could not find any information on this and thought this may be the case but I wanted to double check here. Some microcontrollers share onboard features with I/O pins and I want to make sure there aren't any conflicts.
My application is using the 3.5mm audio jack, a real-time clock (pin 1-6), a 16x2 LCD display, and several other GPIO pins to drive MOSFET power relays for lights and I want to ensure that I don't have any conflicting pins.