On Mon, Nov 28, 2016 at 12:29:07AM +0000, André 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.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com