There's already a way to mount your smartphone to a Steam Controller

The Basegrip for Steam Controller is contoured to fit snuggly over the back of the controller while leaving room for its ...

This accessory can snap a Steam Controller to your phone — or almost anything else

When the Basegrip is paired with Mechanism’s phone mount, the company suggests that you can use the Steam Controller to ...

Valve opens Steam Controller sales next week — what to know ahead of ordering

Valve starts sales of its new Steam Controller on May 4, but there are some important compatibility details gamers should ...
Liliputing

Now you can run Steam games in Linux on some handhelds that ship with Android

And emulation software allows you to run some x86 apps and games on Arm-based processors, as well as play some Windows games ...