linux-kernel - Re: [PATCH 2/4] dt-bindings: mfd: x-powers,axp152: add boost regulator

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Date: Sat, 30 Mar 2024 21:40:22 +0000
From: Andre Przywara <andre.przywara@....com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Chen-Yu Tsai <wens@...e.org>, Lee Jones <lee@...nel.org>, Liam Girdwood
 <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-sunxi@...ts.linux.dev, Jernej Skrabec
 <jernej.skrabec@...il.com>, Samuel Holland <samuel@...lland.org>, Ryan
 Walklin <ryan@...ttoast.com>, Chris Morgan <macroalpha82@...il.com>
Subject: Re: [PATCH 2/4] dt-bindings: mfd: x-powers,axp152: add boost
 regulator

On Sat, 30 Mar 2024 10:30:05 +0100
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

Hi,

> On 30/03/2024 00:50, Andre Przywara wrote:
> > The X-Powers AXP717 contains a boost regulator, that it meant to provide
> > the 5V USB VBUS voltage when the devices operates on battery.
> > 
> > Add the name "boost" to the regexp describing the allowed node names,
> > to allow the regulator to be described in the devicetree.
> > 
> > Signed-off-by: Andre Przywara <andre.przywara@....com>
> > ---
> >  Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml b/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
> > index b8e8db0d58e9c..14ab367fc8871 100644
> > --- a/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
> > +++ b/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
> > @@ -274,7 +274,7 @@ properties:
> >            Defines the work frequency of DC-DC in kHz.
> >  
> >      patternProperties:
> > -      "^(([a-f])?ldo[0-9]|dcdc[0-7a-e]|ldo(_|-)io(0|1)|(dc1)?sw|rtc(_|-)ldo|cpusldo|drivevbus|dc5ldo)$":
> > +      "^(([a-f])?ldo[0-9]|dcdc[0-7a-e]|ldo(_|-)io(0|1)|(dc1)?sw|rtc(_|-)ldo|cpusldo|drivevbus|dc5ldo|boost)$":  
> 
> That's not an easy to read regex...

TBH regexps are the least of my problems when reading bindings ;-)

> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Thanks!

> If driver does not depend on _, please consider dropping (_|-).

The drivers (checked both Linux and FreeBSD) do look for a specific
string, but it's the real old regulators that used ldo_io[01] and
rtc_ldo, all the "newer" ones use a dash. Since this binding covers all
of them, we can't drop this from this regexp, but rest assured we only
go with dashes for new and upcoming devices.

Thanks,
Andre