Can you use a PS4 controller on a PS5? Yes, here's how

To use your PS4 controller on a PS5, connect it to the PS5 with a USB cable and press the PlayStation button on the controller.
techtimes

Will Your PS4 Controller Work on PS5? Here's Short Explainer About Its Compatibility

For gamers, backwards compatibility is always a "green" flag since this will allow them to play games from older consoles. It has been a cornerstone of console gaming for many years, to say the least.
Play Station Universe

Guide: How To Connect PS4 Controller To PS5

Guide: How To Connect PS4 Controller To PS5 – The brand new DualSense controller for PS5 is great for playing the newest PS5 games on the market. But sometimes, when going back to older PS4 titles, it ...
SlashGear

Can You Use A PS4 Controller On The PS5?

Backwards compatibility is truly the backbone of console gaming. One of the few consoles that did this incredibly well was the PlayStation 2, letting gamers play most of their favorite PS1 titles on ...