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

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Date: Wed, 27 Mar 2024 10:56:18 +0000
From: Yu-chang Lee (李禹璋) <Yu-chang.Lee@...iatek.com>
To: "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
	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 Wed, 2024-03-27 at 11:43 +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 11:39, Yu-chang Lee (李禹璋) wrote:
> >>>>
> >>> 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...
> > 
> > Sorry, May you elaborate on what information I need to provide to
> you
> > or it is just a syntax problem I need to fix?
> 
> Please explain the purpose of this property (how is it going to be
> used by drivers)and what does it represent.
> 

It represent SMI LARB(Local ARBitration). In power domain driver when
power on power domain, It need to reset LARB to prevent potential power
glitch which may cause dummy transaction on bus. Without taking care of
this issue it often leads to camera hang in stress test.

Best Regards,
Yu-chang