linux-kernel - Re: [RESENT PATCH] ARM: bcm2835: Add devicetree for the Raspberry Pi 3, for arm (32)

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Date:   Thu, 02 Feb 2017 02:16:09 -0800
From:   Michael Zoran <mzoran@...wfest.net>
To:     Stefan Wahren <stefan.wahren@...e.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Eric Anholt <eric@...olt.net>
Cc:     Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Russell King <linux@...linux.org.uk>,
        open list <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-rpi-kernel@...ts.infradead.org,
        "moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RESENT PATCH] ARM: bcm2835: Add devicetree for the Raspberry
 Pi 3, for arm (32)

On Thu, 2017-02-02 at 10:50 +0100, Stefan Wahren wrote:
> Am 02.02.2017 um 09:37 schrieb Michael Zoran:
> > This is actually a problem I had to deal with way in the begging of
> > ARM64.  What was done in the github tree was to have the one of the
> > DTS
> >    files(in this case 64) #include the 32 bit dts.  That way it's
> > not
> > needed to have the symbolic link and install should work.
> > 
> > I know it's ulgy, but it works...
> > 
> > Take a look at:
> > https://github.com/raspberrypi/linux/blob/rpi-4.10.y/arch/arm64/boo
> > t/dt
> > s/broadcom/bcm2710-rpi-3-b.dts
> > 
> > Here is what the file contains:
> > #define RPI364
> > 
> > #include "../../../../arm/boot/dts/bcm2710-rpi-3-b.dts"
> > 
> > 
> > 
> 
> This do not work in the context of the split device-tree repository
> [0] 
> (where the directory structure differs).
> 
> [0] 
> https://git.kernel.org/cgit/linux/kernel/git/devicetree/devicetree-re
> basing.git/

Well, two other options would be to simply duplicate the device tree
files. I know that's a pain...

The other option is choose one or the other(arm64 vs. arm32), I would
guess pick arm32.  It works...  And at this time, arm64 doesn't have a
whole bunch of benefit on the RPI 3.  Perhaps maybe a RPI 4 will come
out someday and we will see more of a gain.