How to set the OTG USB port of Orange Pi PC to be used as a normal USB port

[Char11e]

The system I currently use:
Armbian 23.11.1 jammy

 

Linux kernel version:
Linux orangepipc 6.1.63-current-sunxi #1 SMP Mon Nov 20 10:52:19 UTC 2023 armv7l armv7l armv7l GNU/Linux

 

Currently I want to make this OTG USB work like the other three USB Ports.

 

Do I need to recompile DTS?

Edited December 30, 2023 by Char11e

[Char11e]

pi@orangepipc:~$ dmesg |grep musb
[    2.610963] musb-hdrc musb-hdrc.4.auto: MUSB HDRC host driver
[    2.611005] musb-hdrc musb-hdrc.4.auto: new USB bus registered, assigned bus number 9
[    2.611363] usb usb9: Manufacturer: Linux 6.1.63-current-sunxi musb-hcd
[    2.611373] usb usb9: SerialNumber: musb-hdrc.4.auto

[Char11e]

pi@orangepipc:~$ sudo modprobe g_serial
pi@orangepipc:~$ lsmod | grep serial
g_serial               16384  0
u_serial               24576  1 usb_f_acm
libcomposite           45056  2 g_serial,usb_f_acm

I have the g_serial module enabled, but this seems to be the function that makes otg a serial port.

 

[Gunjan Gupta]

remove g_serial from /etc/modules. Then if you have a otg adapter then it should work fine

[Char11e]

I uninstalled g_serial using modprobe but it doesn't seem to work.

 

I tried using the lsusb and lsblk commands to check. When I connected the OTG USB, the system did not automatically detect the new device.

pi@orangepipc:~$ lsmod | grep serial
u_serial               24576  1 usb_f_acm
pi@orangepipc:~$ lsusb
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 002: ID 0080:a001 Unknown JMS578 based SATA bridge
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 009 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
pi@orangepipc:~$ lsblk
NAME        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
sda           8:0    0  2.7T  0 disk
└─sda1        8:1    0  2.7T  0 part /home/pi/dl
mmcblk0     179:0    0 14.8G  0 disk
└─mmcblk0p1 179:1    0 14.7G  0 part /var/log.hdd
                                     /
zram0       254:0    0  499M  0 disk [SWAP]
zram1       254:1    0   50M  0 disk /var/log
zram2       254:2    0    0B  0 disk

[Gunjan Gupta]

It should work after a reboot. But as you manually removed using modprobe command, the module will return on reboot.

[Char11e]

Thank you for your answer.
However, after I restarted the system, the g_serial module has been uninstalled. However, after I connected the USB OTG external device, the device was still not read.

pi@orangepipc:~$ lsmod | grep serial
pi@orangepipc:~$ lsmod | grep usb
pi@orangepipc:~$ lsusb
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 002: ID 0080:a001 Unknown JMS578 based SATA bridge
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 009 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
pi@orangepipc:~$ lsusb
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 002: ID 0080:a001 Unknown JMS578 based SATA bridge
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 009 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
pi@orangepipc:~$

My device is a USB2.0 8G flash drive.
I'm not sure if I've set it up correctly?

[Gunjan Gupta]

Main debugging information that would be needed in this case will be in kernel logs i.e. dmesg output.

[Char11e]

This is the dmesg_log of my system.

dmseg_log.txt

[Gunjan Gupta]

it shows your otg port is in auto mode, did you had your otg cable connected when taking the logs?

[Char11e]

Yes, when I captured the dmesg log, I had the otg usb cable connected and an 8g usb2.0 flash drive connected.

[Char11e]

@Gunjan Gupta

 

Thank you for your suggestion. Currently, the kernel is upgraded to 6.6.36-current-sunxi.

I found that the dts file has the USB defaulted to otg mode, and the USB storage device can be read and used normally.

usb@1c19000 {
                        compatible = "allwinner,sun8i-h3-musb";
                        reg = <0x1c19000 0x400>;
                        clocks = <0x03 0x20>;
                        resets = <0x03 0x11>;
                        interrupts = <0x00 0x47 0x04>;
                        interrupt-names = "mc";
                        phys = <0x18 0x00>;
                        phy-names = "usb";
                        extcon = <0x18 0x00>;
                        dr_mode = "otg";
                        status = "okay";
                        phandle = <0x57>;