[PATCH v2 2/3] ARM: dts: sunxi: add support for Orange Pi Zero board

[Icenowy Zheng]

02.12.2016, 22:30, "Hans de Goede" <hdegoede at redhat.com>:
> Hi,
>
> On 02-12-16 15:22, Icenowy Zheng wrote:
>>  01.12.2016, 17:36, "Maxime Ripard" <maxime.ripard at free-electrons.com>:
>>>  On Mon, Nov 28, 2016 at 12:29:07AM +0000, André Przywara wrote:
>>>>   > Something more interesting happened.
>>>>   >
>>>>   > Xunlong made a add-on board for Orange Pi Zero, which exposes the
>>>>   > two USB Controllers exported at expansion bus as USB Type-A
>>>>   > connectors.
>>>>   >
>>>>   > Also it exposes a analog A/V jack and a microphone.
>>>>   >
>>>>   > Should I enable {e,o}hci{2.3} in the device tree?
>>>>
>>>>   Actually we should do this regardless of this extension board. The USB
>>>>   pins are not multiplexed and are exposed on user accessible pins (just
>>>>   not soldered, but that's a detail), so I think they qualify for DT
>>>>   enablement. And even if a user can't use them, it doesn't hurt to have
>>>>   them (since they are not multiplexed).
>>>
>>>  My main concern about this is that we'll leave regulators enabled by
>>>  default, for a minority of users. And that minority will prevent to do
>>>  a proper power management when the times come since we'll have to keep
>>>  that behaviour forever.
>>
>>  I think these users can add a 'fdt set /xxx/xxx status "disabled" ' .
>
> I don't think that will be necessary I'm pretty sure these extra usb
> ports do not have a regulator for the Vbus, they just hook directly
> to the 5V rail, can someone with a schematic check ?

We seems to have still no schematics for the add-on board.

But something is sure is that there's no any regulator-related pins
on the add-on pinout. There's only USB DM and DP pins.

So the Vbus must be directly connected to +5V.

>
> Regards,
>
> Hans