[U-Boot] DM for ci_udc

[Sven Schwermer]

Hi,

I’m running into linking issues when enabling CONFIG_DM_USB_GADGET with CONFIG_CI_UDC because dm_usb_gadget_handle_interrupts is not available. That made me look into what’s required to port ci_udc to driver model. I have a few conceptual questions about this:

1. Some other USB gadget drivers (dwc3-generic, ti-musb) seem to create a wrapper driver that binds either the gadget or the host-mode driver to the USB device, depending on the configured mode. Is this the desired approach?

2. I’m working with a i.MX6 (7) device so the host-mode driver is ehci-mx6, but I’ve seen that ci_udc is also used with other host-mode drivers. How would a wrapper work in this case where there are multiple possible host-mode drivers but one gadget driver?

3. Any tips and hints are welcome :)

Best regards,
Sven