Solved
Does Linux on STM32MP support connection of USB hubs and OTG ?
Is the USB controller in MP chips same as in F7 (Tensilica) or compatible?
Does it support connection of devices thru a full speed hub?
Does it support OTG mode?
Thanks,
Pavel A.
PatrickFBest answer
ST Employee
May 6, 2019
In STM32MP1, there is two USB controllers with up to three ports with embedded PHY in total:
- a full EHCI/OHCI USB Host controller (acronym: USBH) with 2 High-Speed ports and embedded PHY wich fully support Hub (as example, you have one external Hub on STM32MP1 Discovery and Evaluation boards). This is only a Host controller, and so, does not support OTG.
- an OTG High-Speed controller, similar the the one used on other STM32 MCUs (like STM32H7 series) which support Host or Device mode. Supports OTG (altough now superseded by USB Type-C Dual Role Port. for Type-C, see Discovery board for example, and this post. The OTG IP share one High-Speed PHY with second port of USBH controller or could have dedicated Full-Speed PHY.
Notice that in STM32MP1, our SW delivery support USBH and OTG on Linux (Cortex-A7) only.
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