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

[Krzysztof Kozlowski <krzk@kernel.org>]

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@collabora.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@public-files.de>
>>>>
>>>> Add support for mmc on MT7988 SoC.
>>>>
>>>> Signed-off-by: Frank Wunderlich <frank-w@public-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