imx8mp usb 传输速度配置

[gaotao]

在imx8mp中怎么将usb根节点控制器（root_hub）的速率由480M切换到12M？？
imx8mp-evk.dts中的配置貌似不起作用
&usb_dwc3_0 

    maximum-speed = "full-speed";
是需要在驱动中修改寄存器或者改变握手相关代码吗？dwc的问题还是xhci(plat)？

[AldoG]

Hello,

the property for the node is ok, but please note that this does apply only if it is working as peripheral, if the i.MX8MP is working as a host, then the negotiation takes care of the speed being used.

Best regards/Saludos,
Aldo.