linux-kernel - Re: [PATCH 1/2] dt-bindings: power: Add regulator-pd yaml file

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Message-ID: <CAPDyKFoV2Z=-WUiF3SgXqhF+K+r5QqsLgz8_hau0WKfZxTzYpg@mail.gmail.com>
Date:   Fri, 25 Aug 2023 14:24:43 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Shenwei Wang <shenwei.wang@....com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH 1/2] dt-bindings: power: Add regulator-pd yaml file

On Thu, 24 Aug 2023 at 18:35, Shenwei Wang <shenwei.wang@....com> wrote:
>
>
>
> > -----Original Message-----
> > From: Ulf Hansson <ulf.hansson@...aro.org>
> > Sent: Thursday, August 24, 2023 4:27 AM
> > To: Shenwei Wang <shenwei.wang@....com>
> > Cc: Rob Herring <robh+dt@...nel.org>; Krzysztof Kozlowski
> > <krzysztof.kozlowski+dt@...aro.org>; Conor Dooley <conor+dt@...nel.org>;
> > Liam Girdwood <lgirdwood@...il.com>; Mark Brown <broonie@...nel.org>;
> > imx@...ts.linux.dev; devicetree@...r.kernel.org; linux-kernel@...r.kernel.org;
> > dl-linux-imx <linux-imx@....com>
> > Subject: [EXT] Re: [PATCH 1/2] dt-bindings: power: Add regulator-pd yaml file
> >
> > Caution: This is an external email. Please take care when clicking links or
> > opening attachments. When in doubt, report the message using the 'Report this
> > email' button
> >
> >
> > On Fri, 18 Aug 2023 at 17:35, Shenwei Wang <shenwei.wang@....com> wrote:
> > >
> > > Documenting the regulator power domain properties and usage examples.
> >
> > As Rob and Krzysztof already pointed out, I agree that this binding looks a bit
> > questionable.
> >
> > Rather than adding a new DT binding, why can't we just use the existing way of
> > describing a platform specific power-domain provider?
>
> Can you please provide more details on how you thought we should implement this
> feature using the existing way? Very appreciate if you could provide a simple example.
>
> > This still looks platform specific to me.
>
> What does platform specific exactly mean here?  I want to make sure I understand
> what you were referring to.

There are plenty of examples of how a platform specific genpd provider
looks in DT. You may have a look a imx platforms for example.

git grep "#power-domain-cells" arch/arm/boot/dts/nxp/imx

The genpd provider then needs to be a consumer of the resources it
needs. In this case a couple of regulators it seems like.

[...]

Kind regards
Uffe