[imx8qm] usb otg2 configuration

[hihanna]

Hello

I'm developing it for imx8qm and I'd like to set usbotg2 to peripheral (device) mode.

I think I need to write "Target Controller Driver", is there a document or file that I can refer to? 

And if anyone knows how to set up a dts file, please let me know.

(The circuit is designed as follows.)

[Rita_Wang]

The i.MX8QM application processor has a specified USB3/USB2 OTG module to perform USB 3.0 dual-
role and USB 2.0 On-The-Go (OTG) compatible with the USB 3.0 specification. The processor has an
additional separate, independent USB 2.0 OTG controller which can be used simultaneously with this
USB 3.0.

In our reference design we use the USB2 support dual role you can refer to.