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Message-ID: <75b78eaf-9b13-477c-bf02-4e9837a25dd4@linaro.org>
Date: Tue, 21 May 2024 10:22:42 +0200
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Subject: Re: [PATCH 2/4] arm64: dts: mediatek: mt8365: use a specific SCPSYS
 compatible
To: Alexandre Mergnat <amergnat@baylibre.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>,
 Lee Jones <lee@kernel.org>, Rob Herring <robh@kernel.org>,
 Krzysztof Kozlowski <krzk+dt@kernel.org>, Conor Dooley
 <conor+dt@kernel.org>, Matthias Brugger <matthias.bgg@gmail.com>,
 MandyJH Liu <mandyjh.liu@mediatek.com>, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
 linux-mediatek@lists.infradead.org
References: <20240518211159.142920-1-krzysztof.kozlowski@linaro.org>
 <20240518211159.142920-2-krzysztof.kozlowski@linaro.org>
 <f42ef151-6eee-418f-91e1-5ac08d161119@collabora.com>
 <2cc638ca-0add-4c8c-b844-606e22dbd253@linaro.org>
 <cf8c87fe-7a4f-423f-9c97-3759eeee4894@collabora.com>
 <51a47736-ffe8-49e2-b798-d409ca587501@baylibre.com>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <51a47736-ffe8-49e2-b798-d409ca587501@baylibre.com>
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On 20/05/2024 17:23, Alexandre Mergnat wrote:
> Hello Krzysztof,
> 
> On 20/05/2024 12:12, AngeloGioacchino Del Regno wrote:
>> Il 20/05/24 12:03, Krzysztof Kozlowski ha scritto:
>>> On 20/05/2024 11:55, AngeloGioacchino Del Regno wrote:
>>>> Il 18/05/24 23:11, Krzysztof Kozlowski ha scritto:
>>>>> SoCs should use dedicated compatibles for each of their syscon nodes to
>>>>> precisely describe the block.  Using an incorrect compatible does not
>>>>> allow to properly match/validate children of the syscon device.  Replace
>>>>> SYSCFG compatible, which does not have children, with a new dedicated
>>>>> one for SCPSYS block.
>>>>>
>>>>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>>>>
>>>> Technically, that's not a SCPSYS block, but called SYSCFG in MT8365, but the
>>>> meaning and the functioning is the same, so it's fine for me.
>>>
>>> So there are two syscfg blocks? With exactly the same set of registers
>>> or different?
>>>
>>
>> I'm not sure about that, I don't have the MT8365 datasheet...
>>
>> Adding Alexandre to the loop - I think he can clarify as he should have the
>> required documentation.
> 
> Unfortunately, The SCPSYS (@10006000) isn't documented, but according to the functionnal 
> specification, it seems to have only one block.
> 
> I don't have the history why SYSCFG instead of SCPSYS.
> 
> I've tested your serie and have a regression at the kernel boot time:
> [    7.738117] mtk-power-controller 10006000.syscon:power-controller: Failed to create device link 
> (0x180) with 14000000.syscon
> 
> It's related to your patch 3/4.

I don't see how this could be related. The error is mentioning entirely
different node - mmsys. No driver binds to 10006000.syscon, except the
MFD syscon of course, so my change should have zero effect on drivers.

The mtk-pm-domains (so child of patch affected in 3/4) only takes regmap
from the parent, so the cells again are not related.

Just to be sure: you are testing mainline or next, without any other
patches on top except mine?

> 

Best regards,
Krzysztof