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

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Message-ID: <PAXPR04MB91850D8807CE374BD7C30CC5891EA@PAXPR04MB9185.eurprd04.prod.outlook.com>
Date:   Mon, 21 Aug 2023 13:22:50 +0000
From:   Shenwei Wang <shenwei.wang@....com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: Saturday, August 19, 2023 3:04 AM
> To: Shenwei Wang <shenwei.wang@....com>; 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; 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
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>
>
> >>
> >> 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.
>
> Why do you start discussion from zero ignoring all previous history of this
> patchset?
>

Thank you for providing the link. After reviewing the entire thread, I still don't understand how
to proceed. What is the conclusion regarding this commonly used use case but overlooked feature
in the upstream kernel?

Thanks,
Shenwei

> https://lore.kern/
> el.org%2Fall%2F20220609150851.23084-1-
> max.oss.09%40gmail.com%2F&data=05%7C01%7Cshenwei.wang%40nxp.com%
> 7C2cf40d23202c430302c908dba08add2e%7C686ea1d3bc2b4c6fa92cd99c5c301
> 635%7C0%7C0%7C638280290493921016%7CUnknown%7CTWFpbGZsb3d8eyJ
> WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C
> 3000%7C%7C%7C&sdata=0O%2FIytE6YbJL26je7hoxEu0ayZYs07PBjfZkBDVaC1M
> %3D&reserved=0
>
> Best regards,
> Krzysztof