linux-kernel - Re: [PATCH v2 1/3] dt-bindings: pfuze100: add optional disable switch-regulators binding

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Date:   Wed, 18 Jul 2018 16:58:58 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Rob Herring <robh@...nel.org>
Cc:     lgirdwood@...il.com, broonie@...nel.org, mark.rutland@....com,
        fabio.estevam@....com, Anson.Huang@....com, kernel@...gutronix.de,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: pfuze100: add optional disable
 switch-regulators binding

Hi Rob,

thanks for the review. I will integrate it in a v3.

Regards,
Marco

On 18-07-16 11:55, Rob Herring wrote:
> On Fri, Jul 13, 2018 at 02:50:01PM +0200, Marco Felsch wrote:
> > This binding is used to keep the backward compatibility with the current
> > dtb's [1]. The binding informs the driver that the unused switch regulators
> > can be disabled.
> > If it is not specified, the driver doesn't disable the switch regulators.
> > 
> > [1] https://patchwork.kernel.org/patch/10490381/
> > 
> > Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
> > 
> > ---
> > Changes in V2:
> >   - add more information about the binding
> >   - rename binding and add vendor prefix
> > 
> >  .../devicetree/bindings/regulator/pfuze100.txt        | 11 +++++++++++
> >  1 file changed, 11 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/regulator/pfuze100.txt b/Documentation/devicetree/bindings/regulator/pfuze100.txt
> > index 672c939045ff..2c46b8d368db 100644
> > --- a/Documentation/devicetree/bindings/regulator/pfuze100.txt
> > +++ b/Documentation/devicetree/bindings/regulator/pfuze100.txt
> > @@ -4,6 +4,17 @@ Required properties:
> >  - compatible: "fsl,pfuze100", "fsl,pfuze200", "fsl,pfuze3000", "fsl,pfuze3001"
> >  - reg: I2C slave address
> >  
> > +Optional properties:
> > +- fsl,pfuze-support-disable: Boolean, if present disable all unused switch
> > +  regulators to save power consumption. Attention, till 4.18 these regulators
> 
> You shouldn't have kernel version info in bindings.
> 
> > +  were always on without specifying "regulator-always-on". So be sure to mark
> > +  import regulators as "regulator-always-on" (e.g. DDR ref, DDR supply). If
> 
> s/import/important/
> 
> > +  not present, the switched regualtors are always on and can't be disabled.
> > +  This binding is a workaround to keep backward compatibility with old dtb's
> > +  which rely on the fact that the switched regulators are always on and don't
> > +  mark them explicit as "regulator-always-on". On new dtbs this property should
> > +  always be present.
> > +
> >  Required child node:
> >  - regulators: This is the list of child nodes that specify the regulator
> >    initialization data for defined regulators. Please refer to below doc
> > -- 
> > 2.18.0
> > 
> 

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