[meta-freescale] USB dual-role behavior with USB-C?

Fabio Estevam festevam at gmail.com
Fri Dec 8 05:32:53 PST 2017

Hi Takashi,

On Fri, Dec 8, 2017 at 8:38 AM, Takashi Matsuzawa <tmatsuzawa at xevo.com> wrote:
> Hello.
> Just in case if you already have pointer or experience with this, any
> suggestion is highly appreciated.
> Some of the recent boards has USB-C socket for USB-OTG port, and I wonder
> how I can try the following steps (USB-OTG dual-role behavior testing) with
> USB-C sockets.
> https://www.kernel.org/doc/Documentation/usb/chipidea.txt
> The steps involves micro-A and micro-B plugs, but for my board only USB-C
> plug can be inserted.
> (I tried C-C cable to connect two boards, but nothing happened - both of the
> boards stayed in gadget role, neither becoming the host).
> I have confirmed my board can act as host (can detect a device attached and
> shown on lsusb output) or gadget (by loading mass storage driver, it can be
> shown as external disk from my PC).
> (Well, however these behaviors are not stable yet.)
> Anyway:
> - How can I conduct test steps outlined in chipidea.txt memo.
> How can I interpret it with UCB-C ports or is there alternative test steps?

This seems to be off topic for this list.

Please post it at linux-usb at vger.kernel.org with the Chipidea
maintainer (Peter.Chen at nxp.com) on Cc.

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