If it still isn't showing up, Alex found that a manual "kick" in the PC's is the final piece of the puzzle:
The main controller driver for modern Exynos SoCs is dwc3-exynos.c . This driver acts as a “glue” layer between the generic DWC3 core driver and the Samsung‑specific hardware. It handles clocks, regulators, power management, and provides the necessary platform data for the DWC3 core. Recent kernel patches have added support for various Exynos variants to this same driver, including support for Exynos850 (which, as we have established, is the same as Exynos 3830). The driver is selected in the kernel configuration via the CONFIG_USB_DWC3_EXYNOS option, which is described as “Samsung Exynos SoC Platform” support. exynos 3830 usb driver work
The device tree nodes for these controllers are described in the kernel’s devicetree bindings. For EHCI, the compatible property must be "samsung,exynos4210-ehci" , and it requires the usual reg , interrupts , clocks , clock-names , phys , and phy-names properties. The phy-names array can contain strings like "host" , "hsic0" , or "hsic1" . An optional samsung,vbus-gpio property can specify a GPIO to pull up VBUS power. If it still isn't showing up, Alex found
Critical for flashing official firmware or recovery files. How to Install and Verify the Driver Recent kernel patches have added support for various
CONFIG_USB_GADGET=y CONFIG_USB_DWC2=y or =m
Reboot your computer to clear out cached system files.