linux-kernel - Re: [PATCH 2/4] dt-bindings: mfd: x-powers,axp152: document AXP717

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Message-ID: <20240313173529.1f816404@donnerap.manchester.arm.com>
Date: Wed, 13 Mar 2024 17:35:29 +0000
From: Andre Przywara <andre.przywara@....com>
To: Samuel Holland <samuel@...lland.org>
Cc: devicetree@...r.kernel.org, Jernej Skrabec <jernej.skrabec@...il.com>,
 Chris Morgan <macromorgan@...mail.com>, linux-kernel@...r.kernel.org,
 linux-sunxi@...ts.linux.dev, Liam Girdwood <lgirdwood@...il.com>, Mark
 Brown <broonie@...nel.org>, Chen-Yu Tsai <wens@...e.org>, Lee Jones
 <lee@...nel.org>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>
Subject: Re: [PATCH 2/4] dt-bindings: mfd: x-powers,axp152: document AXP717

On Mon, 11 Mar 2024 17:20:50 -0500
Samuel Holland <samuel@...lland.org> wrote:

Hi Samuel,

thanks for having a look!

> On 3/9/24 19:02, Andre Przywara wrote:
> > The X-Powers AXP717 is a PMIC used on some newer Allwinner devices.
> > Among quite some regulators it features the usual ADC/IRQ/power key
> > parts, plus a battery charger circuit, and some newly introduced USB
> > type-C circuitry.  
> 
> Do you plan to put the Type-C logic under a subnode, or should the
> Type-C connector node go directly under the PMIC node? Either way, the
> binding probably needs to be updated for that.

I haven't looked into this yet, so cannot say which way to go. I
definitely consider this some non-trivial task, so indeed wanted to push
this off to later.
For now there is a device (Anbernic RG35XX) with that PMIC, so we need at
least the regulators to unblock this. USB support is not critical for now.

> > Like two other recent PMICs, it lacks the DC/DC converter PWM frequency
> > control register, that rate is fixed here as well.
> > 
> > Add the new compatible string, and add that to the list of PMICs without
> > the PWM frequency property.
> > 
> > Signed-off-by: Andre Przywara <andre.przywara@....com>
> > ---
> >  Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml b/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
> > index 06f1779835a1e..b8e8db0d58e9c 100644
> > --- a/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
> > +++ b/Documentation/devicetree/bindings/mfd/x-powers,axp152.yaml
> > @@ -83,6 +83,7 @@ allOf:
> >              enum:
> >                - x-powers,axp313a
> >                - x-powers,axp15060
> > +              - x-powers,axp717
> >  
> >      then:
> >        properties:
> > @@ -99,6 +100,7 @@ properties:
> >            - x-powers,axp221
> >            - x-powers,axp223
> >            - x-powers,axp313a
> > +          - x-powers,axp717
> >            - x-powers,axp803
> >            - x-powers,axp806
> >            - x-powers,axp809  
> 
> The regulators patternProperties needs to be updated for the new boost
> regulator.

Ah, I indeed missed this one. I think the former PMICs had this
batter->VBUS boost regulator hidden, controlled entirely by the PMIC?
I will need to check if exposing this will present any surprises. I
guess this goes together with the USB-C support, to have role switching,
unless this appears on some device with just USB-A or micro-B.
I will check what it takes to add this one, the regulator itself looks
easy.

Thanks!
Andre.