linux-kernel - Re: [RFC 3/5] dt-bindings: power: Add binding for MediaTek MT7988 topmisc power controller

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Message-ID: <0B0447D6-0495-4BBA-9F44-8A5191F00377@fw-web.de>
Date: Tue, 15 Apr 2025 13:33:34 +0200
From: Frank Wunderlich <linux@...web.de>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 frank-w@...lic-files.de, Chunfeng Yun <chunfeng.yun@...iatek.com>,
 Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Matthias Brugger <matthias.bgg@...il.com>
CC: Daniel Golle <daniel@...rotopia.org>, Sam Shih <sam.shih@...iatek.com>,
 MandyJH Liu <mandyjh.liu@...iatek.com>, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, linux-phy@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 3/5] dt-bindings: power: Add binding for MediaTek MT7988 topmisc power controller

Am 15. April 2025 11:59:06 MESZ schrieb AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>:
>Il 15/04/25 11:52, Frank Wunderlich ha scritto:
>> Hi Angelo,
>> 
>> Am 14. April 2025 12:25:23 MESZ schrieb AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>:
>>> Il 13/04/25 10:58, Frank Wunderlich ha scritto:
>>>> From: Frank Wunderlich <frank-w@...lic-files.de>
>>>> 
>>>> Topmisc is a systemcontroller used for xs-phy and ethernet on  mt7988.
>>>> Add binding for it.
>>> 
>>> That's the wrong binding... check mfd/syscon.yaml :-)
>>> 
>>> P.S.: Is there any reset controller in topmisc? Any clock?
>>>       If yes, syscon.yaml is also wrong, and you need a driver for that.
>>>       Remember: If it turns out *later* that this has clk/resets and the
>>>       bindings are already set for just a syscon, it's gonna be way harder!
>>> 
>>> Cheers,
>>> Angelo
>> 
>> Ok based on the power-domain-cells property i guessed powercontroller is the right place.
>
>power-domain-cells, but without any power domain assignment, so that was wrong :)))
>
>> 
>> But based on your suggestion i tried moving compatible to syscon binding and made dtbs_check here.
>> 
>> I can confirm dropping the unexpected properties reported by syscon binding (power-domain-cells,clock-cells,adress-cells and size-cells) are not needed for function (xsphy and ethernet).
>> 
>> For verifying that there are really no clocks/resets in topmisc (have not found it in public available register documents) i asked mtk (waiting for answer).
>> 
>> Also got it working without the syscon compatible by changing ethernet driver too (after this change xsphy was also working).
>
>Perfect, a bit of a cleanup and you're done, then!

If i do not have to change/merge driver code...and i hope getting response from mtk soon.

>Cheers!
>
>> 
>> Eth:
>> https://github.com/frank-w/BPI-Router-Linux/commit/d866e648717800b6f6395ad36c38f9effcf0498d
>> Xsphy:
>> <https://github.com/frank-w/BPI-Router-Linux/commit/0121a94df99700487704ca056b210b13db07e90c>
>> 
>> regards Frank
>
>
>


regards Frank