linux-kernel - Re: [PATCH v2 1/1] dt-bindings: fsl: fsl,rcpm: Add #power-domain-cells

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Message-ID: <aIv+CgkePusUoT6Q@lizhi-Precision-Tower-5810>
Date: Thu, 31 Jul 2025 19:36:42 -0400
From: Frank Li <Frank.li@....com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Alexander Stein <alexander.stein@...tq-group.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linuxppc-dev@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] dt-bindings: fsl: fsl,rcpm: Add
 #power-domain-cells

On Thu, Jul 31, 2025 at 08:32:57AM +0200, Krzysztof Kozlowski wrote:
> On Thu, Jul 31, 2025 at 07:58:04AM +0200, Alexander Stein wrote:
> > dtbs_check for ls1021.dtsi warns about unsupported property:
> >  power-controller@...2140 (fsl,ls1021a-rcpm): '#power-domain-cells' does not match any of the regexes: '^pinctrl-[0-9]+$'
> >
> > But if removed the check warns about missing property:
> >  power-controller@...2140 (fsl,ls1021a-rcpm): '#power-domain-cells' is a required property
>
>
> And if any other warning says something, are you going to do that as
> well?
>
> >
> > Given commit 8bcf67b8d893b ("ARM: dts: ls1021a: add #power-domain-cells
> > for power-controller node") explicitly added that property, add it
> > to the expected property list as well.
>
> No, commit does not explain why! It's one of this NXP commits without
> explanation, doing random things.
>
> No, explain why do you think this is a power domain provider - fast
> look told me that it is NOT.

It is not power controller. rcpm controller enable wakeup source.

In arm64, use below patch to fix warning

commit e39f567e1c38c29629962ab327f0ad1a288dcab2
Author: Frank Li <Frank.Li@....com>
Date:   Mon Jul 29 14:59:24 2024 -0400

    arm64: dts: layerscape: rename rcpm as wakeup-control from power-control

    Invoke power-domain.yaml if node name as 'power-control'.

    Rcpm actually are not power domain controller. It just control wakeup
    capability. So rename it as wakeup-control. Fix below CHECK_DTBS warning.

    power-controller@...2140: '#power-domain-cells' is a required property
            from schema $id: http://devicetree.org/schemas/power/power-domain.yaml#

    Signed-off-by: Frank Li <Frank.Li@....com>
    Signed-off-by: Shawn Guo <shawnguo@...nel.org>


Frank

>
> Best regards,
> Krzysztof
>