Regulator driver for usb_vbus_en0

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX1
1

Hi,

I want to have information about which regulator driver drives usb_vbus_en0 pin?
usb_vbus_en0 pin is associated with usb 2.o otg port.
I see that usb_vbus_en0 pin (regulator@14 usb_vbus1) always shows low, it should be driven high for otg to work as host mode, am i right?
So what could be the reason that pin shows low, following is the log
ubuntu@tegra-ubuntu:~$ sudo cat /sys/kernel/debug/gpio
[sudo] password for ubuntu:
GPIOs 0-255, platform/6000d000.gpio, tegra-gpio:
gpio-0 (cam_pwdn_gpio ) in lo
gpio-2 (pcie_wake ) in hi
gpio-28 (usb-vbus3 ) out lo
gpio-57 (rtl-5v0 ) out hi
gpio-59 (bt_ext_wake ) out hi
gpio-60 (reset_gpio ) out lo
gpio-61 (bt_host_wake ) in lo
gpio-65 (sysfs ) out lo
gpio-67 (vdd-disp-3v0 ) out lo
gpio-148 (sysfs ) out lo
gpio-149 (sysfs ) out lo
gpio-169 (lcd-bl-en ) out lo
gpio-186 (sysfs ) out lo
gpio-187 (sysfs ) out lo
gpio-188 (temp_alert ) in hi
gpio-189 (Power ) in hi
gpio-190 (Volume Up ) in hi
gpio-192 (Volume Down ) in hi
gpio-200 (1.extcon ) in lo
gpio-201 (sdhci_cd ) in hi
gpio-203 (en-vdd-sd ) out lo
gpio-204 (sdhci_wp ) in lo
gpio-228 (usb-vbus1 ) out lo
gpio-229 (en-usb-vbus2 ) out hi

Are there any modifications that could be done so that pin could be driven high??
I am using rel 24.2.1.

Thanks,
Prathamesh

2

Hi, the pin is default low as the port is default in device mode, only if the OTG plug in, it will be pull high so that to output VBUS.

3

Hi,

Is there any way, i could drive this pin high irrespective of if otg is plugged in or not

Thanks,
Prathamesh

4

Please refer to this topic for the method to configure GPIO output: [url]https://devtalk.nvidia.com/default/topic/1020887/?comment=5196819[/url]

5

Hi,

I did try steps from above link, but when i export usb_vbus_en0 is get error saying “device or resource busy”
I think error is because some regulator drier is holding that pin and not allowing it to control.

Thanks,
Prathamesh