On Fri, Dec 02, 2016 at 10:22:30PM +0800, Icenowy Zheng wrote:
>
>
> 01.12.2016, 17:36, "Maxime Ripard" <maxime.ripard@xxxxxxxxxxxxxxxxxx>:
> > 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" ' .
You can't ask that from the majority of users. These users will take
debian or fedora, install it, and expect everything to work
properly. I would make the opposite argument actually. If someone is
knowledgeable enough to solder the USB pins a connector, then (s)he'll
be able to make that u-boot call.
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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