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

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Message-ID: <154b36de-652b-3931-96e6-04e99253a09f@linaro.org>
Date:   Mon, 28 Aug 2023 20:42:13 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
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" <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 28/08/2023 20:39, Shenwei Wang wrote:
> 
> 
>> -----Original Message-----
>> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>> Sent: Monday, August 28, 2023 12:11 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
>> On 28/08/2023 16:04, Shenwei Wang wrote:
>>
>>>>> 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.
>>
>> Not true. This is a real regulator device. Real hardware on the board.
>> You can even see and touch it.
>>
> 
> The physical hardware component is the GPIO pin, which is what you can only touch. 

No. The regulator is the chip.

> The regulator functions virtually through software layer above of the GPIO driver. While 
> we may call it a "regulator" or whatever else, this cannot obscure the fact that the underlying 
> hardware is just a GPIO pin being used in a specialized way.

The regulator is some tiny little box, you can touch and called
ti,tps51632 or similar.



Best regards,
Krzysztof