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小白求教，为什么使用cat /sys/devices/platform/soc@3000000/soc@3000000:usbc0@0/usb_device能开启usb_device模式。
cat /sys/devices/platform/soc@3000000/soc@3000000:usbc0@0/usb_device
在这个目录下面 lichee/linux-5.4/drivers/usb/sunxi_usb
用命令： grep "usb_host" -r . 搜索代码可以看到实现过程的。
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