linux-kernel - Re: [PATCH v2 2/3] dt-bindings: power: Add mediatek larb definition

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Message-ID: <7ff9c4c7-3b56-4a5b-95b7-c37cbf8bcd6d@linaro.org>
Date: Wed, 27 Mar 2024 10:59:50 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Yu-chang Lee (李禹璋) <Yu-chang.Lee@...iatek.com>,
 MandyJH Liu (劉人僖) <MandyJH.Liu@...iatek.com>,
 "conor+dt@...nel.org" <conor+dt@...nel.org>,
 "robh@...nel.org" <robh@...nel.org>,
 "krzysztof.kozlowski+dt@...aro.org" <krzysztof.kozlowski+dt@...aro.org>,
 "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
 "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
 "angelogioacchino.delregno@...labora.com"
 <angelogioacchino.delregno@...labora.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
 Project_Global_Chrome_Upstream_Group
 <Project_Global_Chrome_Upstream_Group@...iatek.com>,
 Xiufeng Li (李秀峰) <Xiufeng.Li@...iatek.com>,
 "linux-arm-kernel@...ts.infradead.org"
 <linux-arm-kernel@...ts.infradead.org>, Fan Chen (陳凡)
 <fan.chen@...iatek.com>
Subject: Re: [PATCH v2 2/3] dt-bindings: power: Add mediatek larb definition

On 27/03/2024 10:34, Yu-chang Lee (李禹璋) wrote:
> On Wed, 2024-03-27 at 10:23 +0100, Krzysztof Kozlowski wrote:
>>  	 
>> External email : Please do not click links or open attachments until
>> you have verified the sender or the content.
>>  On 27/03/2024 09:39, Krzysztof Kozlowski wrote:
>>> On 27/03/2024 06:57, yu-chang.lee wrote:
>>>> Add Smart Multimedia Interface Local Arbiter to mediatek
>>>> power domain.
>>>>
>>>> Signed-off-by: yu-chang.lee <yu-chang.lee@...iatek.com>
>>>> ---
>>>>  .../devicetree/bindings/power/mediatek,power-controller.yaml  | 4
>> ++++
>>>>  1 file changed, 4 insertions(+)
>>>>
>>>> diff --git
>> a/Documentation/devicetree/bindings/power/mediatek,power-
>> controller.yaml
>> b/Documentation/devicetree/bindings/power/mediatek,power-
>> controller.yaml
>>>> index 8985e2df8a56..228c0dec5253 100644
>>>> --- a/Documentation/devicetree/bindings/power/mediatek,power-
>> controller.yaml
>>>> +++ b/Documentation/devicetree/bindings/power/mediatek,power-
>> controller.yaml
>>>> @@ -125,6 +125,10 @@ $defs:
>>>>          $ref: /schemas/types.yaml#/definitions/phandle
>>>>          description: phandle to the device containing the SMI
>> register range.
>>>>  
>>>> +     mediatek,larb:
>>>> +        $ref: /schemas/types.yaml#/definitions/phandle
>>>> +        description: phandle to the device containing the LARB
>> register range.
>>>
>>> Why do you need it?
>>>
>>> Plus I also see mediatek,larbs and mediatek,larb-id... so now we
>> have
>>> third one similar.
>>
>> ... and not even tested!
>>
>> Best regards,
>> Krzysztof
>>
> Hi,
> 
> I will double check the format of yaml for the next version, sorry for
> inconvenience. But I did test it on mt8188 chromebook, the reason why

How do you test a binding on chromebook?

> power domain need larb node is that when mtcmos power on, signal glitch
> may produce. Power domain driver must reset larb when this happen to 
> prevent dummy transaction on bus. That why I need larb node in dts.

No one talks here about larb node...

Best regards,
Krzysztof