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

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Message-ID: <272309da-24ff-49cd-9e4b-287054218cbc@collabora.com>
Date: Mon, 7 Oct 2024 12:14:58 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: 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

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.

>> Cheers,
>> Angelo
>>
>>> ---
>>>    drivers/mmc/host/mtk-sd.c | 14 ++++++++++++++
>>>    1 file changed, 14 insertions(+)
>>>
>>> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
>>> index 89018b6c97b9..6d5afe51a61d 100644
>>> --- a/drivers/mmc/host/mtk-sd.c
>>> +++ b/drivers/mmc/host/mtk-sd.c
>>> @@ -571,6 +571,19 @@ static const struct mtk_mmc_compatible mt7986_compat = {
>>>    	.support_64g = true,
>>>    };
>>>
>>> +static const struct mtk_mmc_compatible mt7988_compat = {
>>> +	.clk_div_bits = 12,
>>> +	.recheck_sdio_irq = true,
>>> +	.hs400_tune = false,
>>> +	.pad_tune_reg = MSDC_PAD_TUNE0,
>>> +	.async_fifo = true,
>>> +	.data_tune = true,
>>> +	.busy_check = true,
>>> +	.stop_clk_fix = true,
>>> +	.enhance_rx = true,
>>> +	.support_64g = true,
>>> +};
>>> +
>>>    static const struct mtk_mmc_compatible mt8135_compat = {
>>>    	.clk_div_bits = 8,
>>>    	.recheck_sdio_irq = true,
>>> @@ -629,6 +642,7 @@ static const struct of_device_id msdc_of_ids[] = {
>>>    	{ .compatible = "mediatek,mt7620-mmc", .data = &mt7620_compat},
>>>    	{ .compatible = "mediatek,mt7622-mmc", .data = &mt7622_compat},
>>>    	{ .compatible = "mediatek,mt7986-mmc", .data = &mt7986_compat},
>>> +	{ .compatible = "mediatek,mt7988-mmc", .data = &mt7988_compat},
>>>    	{ .compatible = "mediatek,mt8135-mmc", .data = &mt8135_compat},
>>>    	{ .compatible = "mediatek,mt8173-mmc", .data = &mt8173_compat},
>>>    	{ .compatible = "mediatek,mt8183-mmc", .data = &mt8183_compat},
>>
>>