i.MX 8QuadXPlus Android P, Turn ADB on by default

[Jonyzhang]

Hi

I have android P running iMX8 board,The USB connector is USB type A. USB connector DP&DN connect to iMX8 USB_OTG1_DP&USB_OTG1_DN pins, iMX8 USB_OTG1_ID pin dangling. In the DTS file "&usbotg1" node add "dr_mode = "peripheral";  ".  After the USB is inserted, board power on.  I use command  "adb devices" not found adb device, UART Debug "cat /sys/kernel/debug/ci_hdrc.0/role" is gadget. reinserted USB, use command  "adb devices" can find adb device.  If after the USB is inserted board power on can find adb device.

Do I need to modify anything?

[Zhiming_Liu]

Do you follow the official design?

[Jonyzhang]

Hi

HW do not follow the official design. The HW official design of OTG1 is Type-C. OTG1 normally works in host mode only. I want to use SW to force OTG1 status,Because need ADB for the debug.

[Zhiming_Liu]

Can you send your schematics about your USB and related dts code?

[Jonyzhang]

usbsch1&usbsch2 is USB schematics.

DTS:

&usbotg1 {

    vbus-supply = <&reg_usb_otg1_vbus>;

    srp-disable;

    hnp-disable;

    adp-disable;

    power-polarity-active-high;

    disable-over-current;

    dr_mode = "peripheral";

    status = "okay";

};

[Jonyzhang · Accepted solution]

Just remove R327&R328, Because OTG1 it's not directly connected to IMX8  there is a U37 in the middle.