Re: [PATCH v1 0/9] Support UDC on Tegra 20/30/114/124

[Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

On 07.07.2017 04:12, Peter Chen wrote:
> On Thu, Jul 06, 2017 at 01:13:01AM +0300, Dmitry Osipenko wrote:
>> On 05.07.2017 23:31, Stephen Warren wrote:
>>> On 07/05/2017 11:19 AM, Dmitry Osipenko wrote:
>>>> Some time ago Thierry Reding sent out patches that enabled UDC on NVIDIA
>>>> Tegra, unfortunately they haven't got enough traction to get into the
>>>> kernel. I've rebased those patches and added a fix for the Ethernet USB
>>>> Gadget on Tegra20, Marc Dietrich tested UDC driver on AC100 and Nicolas
>>>> Chauvet on TK1. Like an original patchset, this series adds support for
>>>> the peripheral mode only.
>>>
>>> Does this mean that the relevant ports no longer support host mode? That's going
>>> to be a user-visible regression, which doesn't sound like a good idea. Isn't OTG
>>> possible instead?
>>
>> We are going to switch only AC100 and TrimSlice to use the UDC driver. Do you
>> know whether that port is working in a host mode with the tegra-ehci driver on
>> these devices? That should be a micro USB port. Since that port is working in a
>> device mode by default, I presume that switching it into a host mode would
>> require some extra 'dance', otherwise I may drop the AC100 / TrimSlice patches.
>>
>> The full-featured OTG should be possible, it could be done later if desired. I'm
>> leaving it to somebody else to implement.
>>
> 
> Full-featured OTG? Do you mean it is compliances OTG spec, or just
> support dual-role switch through ID pin or external connector?
> 

I meant the dual-role.

-- 
Dmitry