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

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Message-ID: <PAXPR04MB918539A19B8F817F623BBD1F891BA@PAXPR04MB9185.eurprd04.prod.outlook.com>
Date:   Fri, 18 Aug 2023 21:06:16 +0000
From:   Shenwei Wang <shenwei.wang@....com>
To:     Rob Herring <robh+dt@...nel.org>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.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: Rob Herring <robh+dt@...nel.org>
> Sent: Friday, August 18, 2023 3:52 PM
> To: Shenwei Wang <shenwei.wang@....com>
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>; Conor Dooley
> <conor+dt@...nel.org>; Ulf Hansson <ulf.hansson@...aro.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
> >
> > Documenting the regulator power domain properties and usage examples.
> 
> This needs to answer why we need this.
> 
> It looks like just an abstraction layer to make regulators look like a power
> domain.
> 

Yes, it is a wrapper that allows using regulators as a power domain. This removes 
the need to add regulator operating code in each consumer device driver. As a power 
domain, the regulator will be managed automatically by the device driver framework 
and PM subsystem.

This is very useful when a device's power is controlled by a GPIO pin, which currently 
requires using the fixed-regulator to achieve the same purpose. However, the 
fixed-regulator approach may have to add code in the driver in order to use it.

Thanks,
Shenwei

> Rob