The pin assignment figures and tables describe the pinouts for the product variants of the device.
As a general rule, peripherals must use GPIO pins in their own domain for all peripheral functions when selected in the PSEL register. Dedicated clock pin requirements are listed in Clock pins. In addition, there are some dedicated pin functions that allow pin connections between different power domains.
The block diagram shows which peripheral and port belong together, see Block diagram.
GPIO ports have their own properties. For details, see GPIO — General purpose input/output.