Hi, iam searching for a solution to powercycle usb devices on imx6ull with tps 2041.
the EN Pin is attached to SODIMM 129. I want to pulldown the pin to powercycle the usb ports in software. but the io is used by “regulator-usbh-vbus" so i can not control it via gpioset.
are there a solution? because the usb devices we use are stucking in special cases so we have to reset them.
thank you very much
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I’d be glad to help! Could you let me know which OS and version you are using? Also, please run the tdx-info command to get your hardware information and share the output. You can find more details about this command at tdx-info.
The solution for power cycling USB devices will depend on your specific platform configuration, and I want to ensure I provide the most accurate guidance for your setup.
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Hello @toraflo,
This pin cannot be changed manually because it is bound to a regulator driver: imx6ull-colibri-eval-v3.dtsi.
In such cases, the regulator can be controlled with the sysfs interface.
Which will expose a few controls under /sys/class/regulator/regulator.X/.
X may vary, so you need to look for the regulator with the correct /sys/class/regulator/regulator.X/name value, which for this regulator is VCC_USB[1-4].
However, you should not be able to turn it off while it has consumers.
An alternative would be to disable the reg_usbh_vbus device tree node and manage this regulator manually via the GPIO pin.
Best Regards,
Bruno
