Is there literature on mobile device architecture?

Question

ARM

Hello. I want to superficially understand the architecture of RISC. The question arose, because I didn’t understand how the CPU and video adapter are combined in mobile devices and why there is a connection between these two components, i.e. they are supplied as a kind of "sets" of the CPU-video adapter inseparably. Is it combined into one chip or is it still different chips, but manufacturers decide which CPUs work better and faster with which video adapters? In this case, the kettle, so I would like something simpler.