linux-kernel - Re: Aw: Re: [PATCH v2 2/2] mmc: mtk-sd: add support for mt7988

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Message-ID: <e6709979-e69e-4b55-be9f-c1353dd8ffc7@kernel.org>
Date: Mon, 7 Oct 2024 13:30:08 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Frank Wunderlich <frank-w@...lic-files.de>
Cc: Frank Wunderlich <linux@...web.de>,
 Chaotian Jing <chaotian.jing@...iatek.com>,
 Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>,
 Wenbin Mei <wenbin.mei@...iatek.com>, linux-mmc@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 daniel@...rotopia.org, john@...ozen.org, eladwf@...il.com,
 ansuelsmth@...il.com
Subject: Re: Aw: Re: [PATCH v2 2/2] mmc: mtk-sd: add support for mt7988

On 07/10/2024 12:14, AngeloGioacchino Del Regno wrote:
> Il 07/10/24 10:37, Frank Wunderlich ha scritto:
>> Hi
>>
>>> Gesendet: Montag, 07. Oktober 2024 um 09:58 Uhr
>>> Von: "AngeloGioacchino Del Regno" <angelogioacchino.delregno@...labora.com>
>>> Betreff: Re: [PATCH v2 2/2] mmc: mtk-sd: add support for mt7988
>>>
>>> Il 06/10/24 17:34, Frank Wunderlich ha scritto:
>>>> From: Frank Wunderlich <frank-w@...lic-files.de>
>>>>
>>>> Add support for mmc on MT7988 SoC.
>>>>
>>>> Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
>>>
>>> There's no need to add yet one more duplicate mtk_mmc_compatible platform
>>> data, nor one more compatible string to this driver, as this is exactly
>>> the same as mt7986.
>>>
>>> Please reuse the MT7986 compatible; in DT you'll have:
>>>
>>> compatible = "mediatek,mt7988-mmc", "mediatek,mt7986-mmc";
>>
>> as explained in binding, the clock config is completely different (except first 2 also required by driver - 3-7 are optional there). mt7988 uses axi and ahb clocks.
>>
>> but i could of course use the mt7988 compatible with mt7986 compat data...but looked dirty to me so just copied the block (to allow later changes if needed).
>>
> 
> In case there will be any changes required *later*, you can always add new platform
> data for the MT7988 compatible, as it's just only a code change and nothing else.
> 
> For now, since they're the same, just reuse mt7986_compat.
> 
> Reusing is way better than duplicating - here and everywhere else - especially when
> this implies a 100% duplication.

If you use same match data, then entire change should be dropped because
it is redundant. Instead express compatibility in the bindings and use
fallback.

Best regards,
Krzysztof