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

[maxime.ripard@free-electrons.com (Maxime Ripard)]

On Mon, Dec 05, 2016 at 07:01:46PM +0800, Icenowy Zheng wrote:
> 
> 
> 05.12.2016, 17:40, "Maxime Ripard" <maxime.ripard@free-electrons.com>:
> > On Mon, Dec 05, 2016 at 04:59:44PM +0800, Icenowy Zheng wrote:
> >> ?2016?12?5? 16:52? Maxime Ripard <maxime.ripard@free-electrons.com>???
> >> ?>
> >> ?> On Fri, Dec 02, 2016 at 10:22:30PM +0800, Icenowy Zheng wrote:
> >> ?> >
> >> ?> >
> >> ?> > 01.12.2016, 17:36, "Maxime Ripard" <maxime.ripard@free-electrons.com>:
> >> ?> > > On Mon, Nov 28, 2016 at 12:29:07AM +0000, Andr? 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.
> >>
> >> ?Now (s)he do not need soldering.
> >>
> >> ?(S)he needs only paying $1.99 more to Xunlong to get the expansion
> >> ?board, and insert it on the OPi Zero.
> >
> > Which is going to require an overlay anyway, so we could have the USB
> > bits in there too.
> 
> If so, I think the [PATCH -next v3 2/2] is ready to be merged ;-)

I meant enabling the USB in the overlay, you enabled it in the base DT.

Maxime

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