linux-kernel - Re: [PATCH v4 07/12] riscv: dts: allwinner: Add Sipeed Lichee RV devicetrees

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Message-ID: <05c1ee07-0750-d40e-8498-55ea07b52ab1@sholland.org>
Date:   Sun, 8 Jan 2023 12:42:20 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        linux-sunxi@...ts.linux.dev, devicetree@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Jisheng Zhang <jszhang@...nel.org>,
        linux-riscv@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Andre Przywara <andre.przywara@....com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor@...nel.org>, linux-kernel@...r.kernel.org,
        Heiko Stuebner <heiko@...ech.de>,
        Palmer Dabbelt <palmer@...osinc.com>
Subject: Re: [PATCH v4 07/12] riscv: dts: allwinner: Add Sipeed Lichee RV
 devicetrees

Hi Paul,

On 1/5/23 07:55, Paul Kocialkowski wrote:
> Hi Samuel,
> 
> On Sat 31 Dec 22, 17:38, Samuel Holland wrote:
>> Sipeed manufactures a "Lichee RV" system-on-module, which provides a
>> minimal working system on its own, as well as a few carrier boards. The
>> "Dock" board provides audio, USB, and WiFi. The "86 Panel" additionally
>> provides 100M Ethernet and a built-in display panel.
>>
>> The 86 Panel repurposes the USB ID and VBUS detection GPIOs for its RGB
>> panel interface, since the USB OTG port is inaccessible inside the case.
> 
> Looks like the panel-enabled variants would better be described as device-tree
> overlays as they are not specific devices but are peripheral extensions.
> 
> What do you think?

I don't agree. The Lichee RV 86 Panel is sold as a complete unit, with
the SoM+board and LCD pre-assembled inside a case. It is not possible to
purchase the board without a panel, so the panel-enabled variants are
the only variants.

Regards,
Samuel