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Subject: Re: [PATCH 1/8] arm64: dts: meson: update spifc node on Khadas VIM2
 meson-gxm-khadas-vim2
To:     Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        Artem Lapkin <email2tema@gmail.com>
Cc:     khilman@baylibre.com, robh+dt@kernel.org, jbrunet@baylibre.com,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org,
        art@khadas.com, nick@khadas.com, gouwa@khadas.com
References: <20200925033017.1790973-1-art@khadas.com>
 <20200925033017.1790973-2-art@khadas.com>
 <CAFBinCDcwHUJzK4HsvKxs1n4_jH9K47bNZcZobocLxKVj7+iNw@mail.gmail.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Message-ID: <10f7b5fd-a86c-c705-fb3e-5bc6c998ab2c@baylibre.com>
Date:   Mon, 28 Sep 2020 09:54:12 +0200
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On 25/09/2020 09:51, Martin Blumenstingl wrote:
> Hi Artem,
> 
> On Fri, Sep 25, 2020 at 5:30 AM Artem Lapkin <email2tema@gmail.com> wrote:
>>
>> 1) The VIM2 Boards use w25q128 spi chip only not w25q32 or w25q16
>>    it's not really seriously becouse have 'jedec,spi-nor' which
>>    have auto chips identifications
> according to the "VIM2 - Transitioning From v1.2 to v1.4" document [0]
> (page 7) both board revisions are using different SPI flash sizes
> for which board revision are your changes?

Indeed, if you changed the flash for the v14 VIM2 board, please:
- move arch/arm64/boot/dts/amlogic/meson-gxm-khadas-vim2.dts into meson-gxm-khadas-vim2.dtsi leaving only the
root compatible, model and the v12 spi flash model&size into the meson-gxm-khadas-vim2.dts file
- add "khadas,vim2-v14" to amlogic board bindings
- introduce a arch/arm64/boot/dts/amlogic/meson-gxm-khadas-vim2-v14.dts file adding the
changes (spi flash change, MCU) with a different root compatible & model

Neil

> 
>> 2) max-frequency is 104Mhz
> (note to self: according to the w25q16 datasheet it supports a maximum
> clock frequency of 104MHz, so this is fine)
> 
> 
> Best regards,
> Martin
>