https://community.nxp.com/t5/i-MX-Processors/imx8mp-usb-%E4%BC%A0%E8%BE%93%E9%80%9F%E5%BA%A6%E9%85%8D%E7%BD%AE/m-p/2303307#M243723 <DIV><SPAN>在imx8mp中怎么将usb根节点控制器（root_hub）的速率由480M切换到12M？？<BR />imx8mp-evk.dts中的配置貌似不起作用<BR />&amp;usb_dwc3_0</SPAN><SPAN>&nbsp;</SPAN></DIV><DIV><SPAN>&nbsp; &nbsp; maximum-speed = </SPAN><SPAN>"full-speed"</SPAN><SPAN>;<BR />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)？<BR /></SPAN></DIV><P>&nbsp;</P><DIV>&nbsp;</DIV> Fri, 30 Jan 2026 01:16:37 GMT gaotao 2026-01-30T01:16:37Z https://community.nxp.com/t5/i-MX-Processors/imx8mp-usb-%E4%BC%A0%E8%BE%93%E9%80%9F%E5%BA%A6%E9%85%8D%E7%BD%AE/m-p/2303307#M243723 <DIV><SPAN>在imx8mp中怎么将usb根节点控制器（root_hub）的速率由480M切换到12M？？<BR />imx8mp-evk.dts中的配置貌似不起作用<BR />&amp;usb_dwc3_0</SPAN><SPAN>&nbsp;</SPAN></DIV><DIV><SPAN>&nbsp; &nbsp; maximum-speed = </SPAN><SPAN>"full-speed"</SPAN><SPAN>;<BR />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)？<BR /></SPAN></DIV><P>&nbsp;</P><DIV>&nbsp;</DIV> Fri, 30 Jan 2026 01:16:37 GMT https://community.nxp.com/t5/i-MX-Processors/imx8mp-usb-%E4%BC%A0%E8%BE%93%E9%80%9F%E5%BA%A6%E9%85%8D%E7%BD%AE/m-p/2303307#M243723 gaotao 2026-01-30T01:16:37Z https://community.nxp.com/t5/i-MX-Processors/imx8mp-usb-%E4%BC%A0%E8%BE%93%E9%80%9F%E5%BA%A6%E9%85%8D%E7%BD%AE/m-p/2305540#M243803 <P>Hello,<BR /><BR />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.<BR /><BR />Best regards/Saludos,<BR />Aldo.</P> Tue, 03 Feb 2026 20:41:17 GMT https://community.nxp.com/t5/i-MX-Processors/imx8mp-usb-%E4%BC%A0%E8%BE%93%E9%80%9F%E5%BA%A6%E9%85%8D%E7%BD%AE/m-p/2305540#M243803 AldoG 2026-02-03T20:41:17Z