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

[Shenwei Wang]

> -----Original Message-----
> From: Rob Herring <robh+dt@xxxxxxxxxx>
> Sent: Friday, August 18, 2023 3:52 PM
> To: Shenwei Wang <shenwei.wang@xxxxxxx>
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@xxxxxxxxxx>; Conor Dooley
> <conor+dt@xxxxxxxxxx>; Ulf Hansson <ulf.hansson@xxxxxxxxxx>; Liam Girdwood
> <lgirdwood@xxxxxxxxx>; Mark Brown <broonie@xxxxxxxxxx>;
> imx@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> dl-linux-imx <linux-imx@xxxxxxx>
> 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