If a controller is USB-A then you can have a USB-C adapter so that you will be able to connect the controller to the Steam Deck.

Here is how to use the PS5 DualSense controller on PC, including how to connect it to Steam and have it work with your games.

Simply pairing a controller, unfortunately, isn’t always enough to play Aperture Desk Job on your PC. Make sure to have exited the game, but keep Steam open.

How to Connect Your PS5 DualSense Controller to Your PC The PlayStation 5 DualSense controller is one of the best gamepads we've ever used, and now you can get it to work with your PC using Steam.

How to connect Xbox controller via Steam to ASUS ROG Ally Since you have access to Steam via the ROG Ally, there’s also the option to connect your Xbox controller via that way too.

We're showing you exactly how to connect your Switch Pro Controller to PC, and how to make the most of it on Steam.

How to use a PS4 controller on Steam Connecting up your PlayStation 4 controller is really easy. You’ll need to have your DualShock 4 handy, as well as the Steam application on your computer.