Subject: [linux-sunxi] Re: [PATCH 4/6] ARM: dts: sun7i: Enable USB DRC on pcDuino 3

From: [email-masked] (Hans de Goede)
Date: Thu, 20 Aug 2015 09:36:33 +0200

Hi,

On 08/20/2015 08:45 AM, Maxime Ripard wrote:
> On Fri, Aug 14, 2015 at 04:44:35PM +0200, Hans de Goede wrote:
>> From: Jelle van der Waa <[email-masked]>
>>
>> Enable the otg/drc usb controller on the pcDuino 3.
>>
>> Note this board has the otg-vbus connected directly to the 5v-dcc of
>> the board, so there is no vbus0 regulator, nor vbus0-det.
>
> Can it do OTG then?

Yes.

> If VBUS is tied to the 5v, there's no way for the
> board to shut it down when acting as peripheral, right?

Correct, the idea is to power it over otg when using it
as a peripheral, or at least power it from a usb port of
the machine for which it is a peripheral. Note that the
original cubieboard (both A10 and A20 versions) have the
same issue.

Regards,

Hans