How to Connect a PS4 Controller to Steam (with Pictures) - wikiHow
Steam Link +iPad Pro + PS4 Controller = Perfection : r/iPadPro
How to Use a PS4 Controller on Steam
Steam Link is $2.50?!?!? Can you use PS4 controller with it? : r/Steam
OUTDATED SEE DESCRIPTION - How to Connect PS4 Controller to PC with STEAM'S Built in Drivers - 2021 - YouTube
In addition to Xbox 360 and Xbox One controllers, it was discovered that Steam Link also supports PS3 and PS4 controllers. I decided to give my Wii U Pro controller a shot. :
Steam Controller Not Connecting via Bluetooth? Here's the Fix for Steam Link on Android « Android :: Gadget Hacks