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: <20180820150201.t2qoqvpsd66arprz@flea>
Date:   Mon, 20 Aug 2018 17:02:01 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: Re: [linux-sunxi] Re: [PATCH] ARM: dts: sun8i: r40/v40: rewrite BPi
 M2 Berry DTS to rebase on M2 Ultra

On Mon, Aug 20, 2018 at 08:06:21PM +0800, Icenowy Zheng wrote:
> 
> 
> 于 2018年8月20日 GMT+08:00 下午8:00:46, Maxime Ripard <maxime.ripard@...tlin.com> 写到:
> >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.
> 
> But I think few developers will have both boards at the same time.

Which is only making it worse, because then someone with only the BPI
m2-ultra, when changing the DT, will not be able to tell that:

 - it's applied to the M2-Berry too,
 - if it works on the M2-Berry.

Maxime

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

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