linux-kernel - Re: [PATCH v2 06/14] arm64: dts: mediatek: mt7988: add cci node

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Message-ID: <6c0dd946bdebd8461307a3e08e60a27f@fw-web.de>
Date: Tue, 20 May 2025 19:08:08 +0200
From: "Frank Wunderlich (linux)" <linux@...web.de>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Andrew Lunn <andrew@...n.ch>, Vladimir Oltean <olteanv@...il.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Rob
 Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor
 Dooley <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>,
 Frank Wunderlich <frank-w@...lic-files.de>, Arınç ÜNAL <arinc.unal@...nc9.com>, Landen Chao
 <Landen.Chao@...iatek.com>, DENG Qingfang <dqfext@...il.com>, Sean Wang
 <sean.wang@...iatek.com>, Daniel Golle <daniel@...rotopia.org>, Lorenzo
 Bianconi <lorenzo@...nel.org>, Felix Fietkau <nbd@....name>,
 netdev@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 06/14] arm64: dts: mediatek: mt7988: add cci node

Am 2025-05-20 13:27, schrieb AngeloGioacchino Del Regno:
> Il 16/05/25 20:01, Frank Wunderlich ha scritto:
>> From: Frank Wunderlich <frank-w@...lic-files.de>
>> 
>> Add cci devicetree node for cpu frequency scaling.
>> --- a/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
>> +++ b/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
>> @@ -12,6 +12,35 @@ / {
>>   	#address-cells = <2>;
>>   	#size-cells = <2>;
>>   +	cci: cci {
>> +		compatible = "mediatek,mt8183-cci";
> 
> While you can keep the mediatek,mt8183-cci fallback, this needs its own 
> compatible
> as "mediatek,mt7988-cci", therefore, I had to drop this patch from the 
> ones that I
> picked.
> 
> Please add the new compatible both here and in the binding.

Hi,

should i add the binding with 2 const (like the bpi-r4-2g5 compatible) 
or first as enum
to allow easier addition of further SoC bindings with same fallback?

currently i changed binding like this (2nd variant):

properties:
   compatible:
     oneOf:
       - items:
           - enum:
               - mediatek,mt8183-cci
               - mediatek,mt8186-cci
       - items:
           - enum:
               - mediatek,mt7988-cci
           - const: mediatek,mt8183-cci

but noticed that these boards are missing the required proc-supply:

   DTC [C] arch/arm64/boot/dts/mediatek/mt8183-pumpkin.dtb
arch/arm64/boot/dts/mediatek/mt8183-pumpkin.dtb: cci: 'proc-supply' is a 
required property
	from schema $id: 
http://devicetree.org/schemas/interconnect/mediatek,cci.yaml#
   DTC [C] arch/arm64/boot/dts/mediatek/mt8186-evb.dtb
arch/arm64/boot/dts/mediatek/mt8186-evb.dtb: cci: 'proc-supply' is a 
required property
	from schema $id: 
http://devicetree.org/schemas/interconnect/mediatek,cci.yaml#

the others are clean so far. But because i do not have these boards i 
cannot fix this without
anyone telling me the proc-supply for them.

In mt7988a.dtsi i can put both compatible on 1 line as there are only 75 
chars, or should i
add linebreak here for better readability?

> Cheers,
> Angelo

regards Frank