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

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Date: Thu, 14 Mar 2024 02:13:29 +0800
From: Chen-Yu Tsai <wens@...e.org>
To: Andre Przywara <andre.przywara@....com>
Cc: Samuel Holland <samuel@...lland.org>, 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>, 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 Thu, Mar 14, 2024 at 1:35 AM Andre Przywara <andre.przywara@....com> wrote:
>
> 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.

I don't think there was such a boost regulator on previous PMICs. It was
just a passthrough, which is why on some boards such as the Cubietruck
there is an external boost converter to put out 5V when just the battery
is used.

ChenYu