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

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Message-ID: <20180724183613.GA10380@gandalf>
Date:   Tue, 24 Jul 2018 20:36:15 +0200
From:   Simon Baatz <gmbnomis@...il.com>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
        linux-sunxi@...glegroups.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: dts: sun8i: r40/v40: rewrite BPi M2 Berry DTS to
 rebase on M2 Ultra

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, 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.
> 
> Thus we can make the M2 Berry device tree based on the M2 Ultra, rather
> than write one from scratch.

Good idea!  I know that Ultra came first and then the cut-down Berry. 
But from a device tree point of view, wouldn't it make more sense to
take M2 Berry as the base and just add the hardware for M2 Ultra?