linux-kernel - Re: [PATCH] dt-bindings: phy: mediatek: tphy: add a property for power-domains

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Message-ID: <3a970560-2458-f5f3-87c5-925079fa12a4@mediatek.com>
Date: Tue, 8 Oct 2024 12:03:37 +0800
From: Macpaul Lin <macpaul.lin@...iatek.com>
To: Conor Dooley <conor@...nel.org>, Jason-ch Chen
	<Jason-ch.Chen@...iatek.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>, Chunfeng Yun
	<chunfeng.yun@...iatek.com>
CC: 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>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.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>, Alexandre Mergnat <amergnat@...libre.com>,
	Bear Wang <bear.wang@...iatek.com>, Pablo Sun <pablo.sun@...iatek.com>,
	Macpaul Lin <macpaul@...il.com>, Sen Chu <sen.chu@...iatek.com>, "Chris-qj
 chen" <chris-qj.chen@...iatek.com>, MediaTek Chromebook Upstream
	<Project_Global_Chrome_Upstream_Group@...iatek.com>, Chen-Yu Tsai
	<wenst@...omium.org>
Subject: Re: [PATCH] dt-bindings: phy: mediatek: tphy: add a property for
 power-domains



On 9/27/24 00:25, Conor Dooley wrote:
> On Thu, Sep 26, 2024 at 06:18:04PM +0800, Macpaul Lin wrote:
>> Some platforms requires a dependency for power-domains.
> 
> Some, so not all? Why isn't this restricted on a per compatible basis?

After discussion with Chunfeng and double check tphy design in detail.
Chunfeng commented that tphy dose not need to add mtcmos.
It is not necessary to add it, if the power of the phy is turned off,
it will affect other functions.

 From the current USB hardware design perspective, even if mtcmos
is added to the phy, it is always on.

>> So we add property 'power-domains' and set 'maxItems: 1' in the
>> DT Schema.
>>
>> Signed-off-by: Macpaul Lin <macpaul.lin@...iatek.com>
>> ---
>>   Documentation/devicetree/bindings/phy/mediatek,tphy.yaml | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml b/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
>> index 423b7c4e62f2..c77fe43c224a 100644
>> --- a/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
>> +++ b/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
>> @@ -125,6 +125,9 @@ properties:
>>       $ref: /schemas/types.yaml#/definitions/uint32
>>       default: 28
>>   
>> +  power-domains:
>> +    maxItems: 1
>> +
>>   # Required child node:
>>   patternProperties:
>>     "^(usb|pcie|sata)-phy@[0-9a-f]+$":
>> -- 
>> 2.45.2
>>

Please drop this patch and I'll send a new fix to mt8195.dtsi.

Thanks
Macpaul Lin