02.12.2016, 22:30, "Hans de Goede" [off-list ref]:

Hi,

On 02-12-16 15:22, Icenowy Zheng wrote:

quoted

?01.12.2016, 17:36, "Maxime Ripard" [off-list ref]:

quoted

?On Mon, Nov 28, 2016 at 12:29:07AM +0000, Andr? Przywara wrote:

quoted

??> 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