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Date: Tue, 21 May 2024 15:26:32 +0200
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Subject: Re: [PATCH 2/4] arm64: dts: mediatek: mt8365: use a specific SCPSYS
 compatible
To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
 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>
 <75b78eaf-9b13-477c-bf02-4e9837a25dd4@linaro.org>
Content-Language: en-US
From: Alexandre Mergnat <amergnat@baylibre.com>
In-Reply-To: <75b78eaf-9b13-477c-bf02-4e9837a25dd4@linaro.org>
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On 21/05/2024 10:22, Krzysztof Kozlowski wrote:
> 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?

I've tested on next

* a018995ac19c (HEAD -> temp, me/temp) arm64: dts: mediatek: mt8173-elm: correct PMIC's syscon reg entry
* 0f118436c61c arm64: dts: mediatek: mt8365: drop incorrect power-domain-cells
* d40e424fe6dc arm64: dts: mediatek: mt8365: use a specific SCPSYS compatible
* d7caa08a4a9b dt-bindings: mfd: mediatek,mt8195-scpsys: add mediatek,mt8365-scpsys
* 82d92a9a1b9e (tag: next-20240515, linux-next/master) Add linux-next specific files for 20240515
*   77ba09d6e7cb Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux.git
|\
| * dedcf3a8e704 tools/power turbostat: version 2024.05.10
| * baac2f4c7f3b tools/power turbostat: Ignore pkg_cstate_limit when it is not available
| * a0525800e2dc tools/power turbostat: Fix order of strings in pkg_cstate_limit_strings
| * ffc2e3d90e6f tools/power turbostat: Read Package-cstates via perf


I did the test with and without "0f118436c61c arm64: dts: mediatek: mt8365: drop incorrect 
power-domain-cells"

Without this specific patch, no regression.


-- 
Regards,
Alexandre