linux-kernel - Re: [linux-sunxi] Re: [PATCH] ARM: dts: sun8i: r40/v40: rewrite BPi M2 Berry DTS to rebase on M2 Ultra

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Message-ID: <20180820120046.7tonxtb52q43ocfq@flea>
Date:   Mon, 20 Aug 2018 14:00:46 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [linux-sunxi] Re: [PATCH] ARM: dts: sun8i: r40/v40: rewrite BPi
 M2 Berry DTS to rebase on M2 Ultra

Hi!

On Wed, Aug 08, 2018 at 06:36:56PM +0800, Icenowy Zheng wrote:
> 在 2018-07-26四的 14:41 +0200，Maxime Ripard写道：
> > On Wed, Jul 25, 2018 at 12:36:55AM +0800, Icenowy Zheng wrote:
> > > Banana Pi designs the BPi M2 Berry board to be software compatible
> > > with
> > > BPi M2 Ultra,
> > 
> > Do you have a reference for this?
> > 
> > > so it's based on M2 Ultra with some function cuts, including:
> > > 
> > > - 2048MiB DRAM -> 1024MiB (this should be proceed by the
> > > bootloader);
> > > - dropped a LED;
> > > - dropped eMMC;
> > > - dropped USB2 and connect USB1 to a 4-port HUB.
> > 
> > Is it the exhaustive list?
> 
> I have asked Mikey from Sinovoip, and he has agreed this.
> 
> Here's a list provided by him, which covers some things I forgot:
> - 2GiB -> 1GiB
> - no eMMC
> - no onboard microphone
> - no IR
> - no charging (and power jack to USB)
> - USB change
> - one less LED
> 
> Should I add this to the device tree's comment?

Not really, because...

> > 
> > I'm a bit reluctant to merge that kind of patches usually, since that
> > would also imply that each time someone will commit something to the
> > M2-Ultra, it would automatically apply to the M2-Berry, without any
> > easy way to tell and / or test.

... this still applies.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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