linux-kernel - Re: [PATCH 1/2] arm64: dts: allwinner: Olimex A64-OLinuXino: enable eMMC.

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Date:   Tue, 25 Sep 2018 11:01:39 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Rodrigo Exterckötter Tjäder 
        <rodrigo@...der.xyz>
Cc:     wens@...e.org, robh+dt@...nel.org, mark.rutland@....com,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arm64: dts: allwinner: Olimex A64-OLinuXino: enable
 eMMC.

On Fri, Sep 21, 2018 at 11:54:07AM -0300, Rodrigo Exterckötter Tjäder wrote:
> On Fri, Sep 21, 2018 at 11:28 AM Maxime Ripard
> <maxime.ripard@...tlin.com> wrote:
> > Expanding a bit more that commit log would be helpful. What is the
> > eMMC connected to that board? Do all versions have it? Which modes are
> > supposed to be supported, and which one have been tested?
> 
> The terseness of the commit message was already pointed out to me on
> #linux-sunxi. I was waiting for more comments before sending a v2.
> 
> But you do touch on something I also realized: there are actually
> three versions of the A64-OLinuXino. In fact only one of them has the
> WiFi board, which is already enabled in the current device tree.

Sigh, ok..

> Wouldn't it be better to split it into three separate device trees? I
> have made a patch that does that[1], if you think that is a good
> approach I can submit that as a patch and then later submit a patch on
> top of that to enable the eMMC only on the two boards that have it.

We can't really do that, unfortunately. If the device tree name was to
change for a given board, we'd break all the build systems, boot
scripts and distros out there.

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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