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

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Date: Wed, 27 Mar 2024 10:39:44 +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 10:59 +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 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...

Sorry, May you elaborate on what information I need to provide to you
or it is just a syntax problem I need to fix?

Thanks
Best Regards,

Yu-chang
> 
> Best regards,
> Krzysztof
>