Yah they are all like that, in the arm space outside of really low end devices and the rk3399 they won't even give you minimal register docs for standard devices. I had problems at the previous place trying to build a PCIe device where the minimum to to even get the most minimal of documentation was 100k units. Sure you could buy the parts from digikey but they were useless because the public docs were little more than footprints and high level whitepaper like feature matrices.