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

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Message-ID: <20161201093619.gs6lmoxtlptp2jr6@lukather>
Date:   Thu, 1 Dec 2016 10:36:19 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     André Przywara <andre.przywara@....com>
Cc:     Icenowy Zheng <icenowy@...c.xyz>, Jonathan Corbet <corbet@....net>,
        Chen-Yu Tsai <wens@...e.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Hans de Goede <hdegoede@...hat.com>,
        Vishnu Patekar <vishnupatekar0510@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] ARM: dts: sunxi: add support for Orange Pi Zero
 board

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.

Maxime

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

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