Apollo Lake abuot USB OTG question

[PSu4]

Follow Document: Feature Comparison of the Intel® Joule™ Module and the Intel Atom® Processor E3900 Series

• I/O Interface LimitationsIntel Atom® processor E3900 series supports a single LPSS SPI port, compared to Joule's two LPSS SPI ports; The Intel® Joule™ module supports USB 2.0 and USB 3.0 OTG while the Intel Atom® processor E3900 series supports USB 2.0 and USB 3.0 dual-role

(it does not support OTG).

follow document , apollo Lake not support USB OTG

but on Linux Yocto can switch USB Host / slave mode with register change , and gadget usb disk with slave mode.

so Intel defined USB OTG is not supported through the Detect USB OTG cable switch Host and Slave role?

ries

[Adolfo_S_Intel]

Hello DFIsw

Could you please clarify what do you refer by Detect USB OTG cable switch?

This in an extract from Intel BIOS Writers Guide for Apollo Lake, this is a private document so I can't show the full document.

"In addition to xHCI USB sub-systems shown in previous chapters, APL SoC integrates an USB OTG controller that supports Device-mode operation at Super Speed, High

Speed, and Full Speed. The host-mode and OTG discovery/switching functionality of the controller are not used.

The platform may assign a dedicated type B USB socket to this controller, or use ID PIN-based multiplexing to share a type AB socket between this controller and one of

the ports of the other USB controllers "

Hope this information is useful for your case.

Best Regards,

Adolfo Sanchez

[PSu4]

Hello AdolfoS

Thank you for your response

About "detect usb otg cable"

USB Type A and Type B through the USB OTG Cable to the ID pin on the voltage changes, switch

USB host / peripheral role, but in the Type C above CC1 and CC2 through the voltage changes determine the role of USB host / peripheral.

I do not understand why Intel in some files that Apollo Lake does not support the meaning of USB OTG?

Best Regards,

DFIsw

[CarlosAM_INTEL]

Hello, DFIsw:

Thanks for your update.

In order to help you, we will contact you via email.

Best regards,

Carlos_A.