I created a table comparing the specs of 12 phones that can be bought with Linux preinstalled:
https://amosbbatto.wordpress.com/2020/08/25/comparing-linux-phones/

It is striking the difference between the amount of information that is publicly available for the PinePhone and Librem 5 compared to all the rest of the Linux phones that use Qualcomm Snapdragon and MediaTek Helio processors, which require NDA's to view their datasheets and don't allow the publication of schematics, because they are based on copyrighted reference designs.