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

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Message-ID: <PAXPR04MB9185957B729588D3E7CA3A5089E0A@PAXPR04MB9185.eurprd04.prod.outlook.com>
Date:   Mon, 28 Aug 2023 14:04:00 +0000
From:   Shenwei Wang <shenwei.wang@....com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
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



> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: Saturday, August 26, 2023 12:32 PM
> To: Shenwei Wang <shenwei.wang@....com>; Ulf Hansson
> <ulf.hansson@...aro.org>
> 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
> >                                                             >
> >                                                             >         regulator-number = <2>;
> >                                                             >         regulator-0-supply = <&reg1>;
> >                                                             >         regulator-1-supply = <&reg2>;
> >     };                                                                    };
> >
> > Are you suggesting to move the regulator-pd to the imx directory and
> > add a company prefix to the compatible string?
> 
> There is no such part of iMX processor as such regulator-power-domain, so I
> don't recommend that approach. DTS nodes represent hardware, not your SW
> layers.
> 

That's not always the case, as we do sometimes need a virtual device. 
As an example, the "regulator-fixed" acts as a software abstraction layer to create virtual regulator 
devices by interfacing with the underlying GPIO drivers.
Similarly, "regulator-pd" provides a software abstraction layer for virtual PD devices built on 
top of existing regulator drivers.
When looking at the conceptual purpose, regulator-fixed and regulator-pd are comparable in 
that they both offer software abstraction layers for virtual devices."

Thanks,
Shenwei

> Best regards,
> Krzysztof