linux-kernel - Re: [PATCH 02/11] arm64: dts: mediatek: Introduce MT8195 Cherry platform's Tomato

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Date:   Mon, 4 Jul 2022 10:59:37 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Chen-Yu Tsai <wenst@...omium.org>,
        Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        matthias.bgg@...il.com, hsinyi@...omium.org,
        allen-kh.cheng@...iatek.com, gtk3@...ox.ru, luca@...tu.xyz,
        sam.shih@...iatek.com, sean.wang@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 02/11] arm64: dts: mediatek: Introduce MT8195 Cherry
 platform's Tomato

Il 04/07/22 06:17, Chen-Yu Tsai ha scritto:
> On Sat, Jul 2, 2022 at 6:12 AM Nícolas F. R. A. Prado
> <nfraprado@...labora.com> wrote:
>>
>> On Thu, Jun 30, 2022 at 05:33:07PM +0200, AngeloGioacchino Del Regno wrote:
>>> Introduce the MT8195 Cherry Chromebook platform, including three
>>> revisions of Cherry Tomato boards.
>>>
>>> This basic configuration allows to boot Linux on all board revisions
>>> and get a serial console from a ramdisk.
>>>
>>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>>> ---
>>>   arch/arm64/boot/dts/mediatek/Makefile         |  3 +++
>>>   .../dts/mediatek/mt8195-cherry-tomato-r1.dts  | 11 ++++++++
>>>   .../dts/mediatek/mt8195-cherry-tomato-r2.dts  | 11 ++++++++
>>>   .../dts/mediatek/mt8195-cherry-tomato-r3.dts  | 12 +++++++++
>>>   .../boot/dts/mediatek/mt8195-cherry.dtsi      | 26 +++++++++++++++++++
>>>   5 files changed, 63 insertions(+)
>>>   create mode 100644 arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts
>>>   create mode 100644 arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts
>>>   create mode 100644 arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts
>>>   create mode 100644 arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
>> [..]
>>> diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts
>>> new file mode 100644
>>> index 000000000000..17e9e4d6f6ab
>>> --- /dev/null
>>> +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts
>>> @@ -0,0 +1,11 @@
>>> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
>>> +/*
>>> + * Copyright (C) 2021 MediaTek Inc.
>>> + */
>>> +/dts-v1/;
>>> +#include "mt8195-cherry.dtsi"
>>> +
>>> +/ {
>>> +     model = "MediaTek Tomato (rev1) board";
>>
>> Given that the compatible is "google," I believe we'll want to rename the model
>> to "Google Tomato", much like was commented on the Asurada series [1], but
>> better to have confirmation from someone from Google. Chen-Yu? :)
> 
> I asked for clarification internally and it turns out we didn't get the
> Asurada series quite right either.
> 
> Google only owns the reference design, that is Asurada for MT8192 and
> Cherry for MT8195. The vendor own the end product design that is based
> off of Google's reference design.
> 
> So for Tomato, the vendor is Acer. Note that "Tomato" and the other
> codenames seen in ChromeOS are public codenames that Google uses.
> 
> The compatible string will likely stay "google,XXX", since this is set
> in firmware, and updating it after the product has shipped poses both
> a significant hurdle and risk.
> 

Yeah, makes sense. Should we call this "Acer Tomato (revX) board" then?
...if we do that, though, we need to know if the other revisions of Tomato
are also from Acer, or we would be getting one right and all the others wrong.

Cheers,
Angelo

> 
> Regards
> ChenYu
> 
>> Otherwise,
>>
>> Reviewed-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
>>
>> Thanks,
>> Nícolas
>>
>> [1] https://lore.kernel.org/all/CAGXv+5Gv2pjPXynz6HCdgux+giPDC5qRk+KW1aFduVz82rM=+g@mail.gmail.com/
>>
>>> +     compatible = "google,tomato-rev1", "google,tomato", "mediatek,mt8195";
>>> +};
>> [..]
>>> --
>>> 2.35.1
>>>