linux-kernel - Re: [PATCH v1 2/4] dt-bindings: mfd: Document Infineon/Cypress CG7153AM MCU

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Message-ID: <CAPVz0n2EwGhCb3r7JTfM38YjyFmejeVbVRGxASqQ7EUH7MY9VQ@mail.gmail.com>
Date: Tue, 25 Mar 2025 08:57:04 +0200
From: Svyatoslav Ryhel <clamor95@...il.com>
To: Rob Herring <robh@...nel.org>
Cc: Lee Jones <lee@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Thierry Reding <thierry.reding@...il.com>, 
	Jonathan Hunter <jonathanh@...dia.com>, Sebastian Reichel <sre@...nel.org>, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org, 
	linux-pm@...r.kernel.org
Subject: Re: [PATCH v1 2/4] dt-bindings: mfd: Document Infineon/Cypress
 CG7153AM MCU

вт, 25 бер. 2025 р. о 05:00 Rob Herring <robh@...nel.org> пише:
>
> On Mon, Mar 24, 2025 at 12:06 PM Svyatoslav Ryhel <clamor95@...il.com> wrote:
> >
> > пн, 24 бер. 2025 р. о 18:52 Rob Herring <robh@...nel.org> пише:
> > >
> > > On Sun, Mar 23, 2025 at 09:14:22AM +0200, Svyatoslav Ryhel wrote:
> > > > Add binding for Cypress CG7153AM embedded controller. Pegatron implemented
> > > > a custom configuration of this MCU in their Chagall tablets, utilizing it
> > > > for battery monitoring.
> > > >
> > > > Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
> > > > ---
> > > >  .../bindings/mfd/cypress,cg7153am.yaml        | 55 +++++++++++++++++++
> > > >  1 file changed, 55 insertions(+)
> > > >  create mode 100644 Documentation/devicetree/bindings/mfd/cypress,cg7153am.yaml
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/mfd/cypress,cg7153am.yaml b/Documentation/devicetree/bindings/mfd/cypress,cg7153am.yaml
> > > > new file mode 100644
> > > > index 000000000000..f8469b5e3816
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/mfd/cypress,cg7153am.yaml
> > > > @@ -0,0 +1,55 @@
> > > > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > > > +%YAML 1.2
> > > > +---
> > > > +$id: http://devicetree.org/schemas/mfd/cypress,cg7153am.yaml#
> > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > +
> > > > +title: Infineon/Cypress Semicon CG7153AM Microcontroller
> > > > +
> > > > +maintainers:
> > > > +  - Svyatoslav Ryhel <clamor95@...il.com>
> > > > +
> > > > +description:
> > > > +  The CG7153AM, an 8-bit programmable microcontroller from Infineon/Cypress
> > > > +  Semiconductor, communicates over I2C and is implemented in devices like the
> > > > +  Pegatron Chagall tablet for fuel gauge and battery control functions.
> > > > +
> > > > +$ref: /schemas/power/supply/power-supply.yaml
> > > > +
> > > > +properties:
> > > > +  compatible:
> > > > +    oneOf:
> > > > +      - items:
> > > > +          - enum:
> > > > +              - pegatron,chagall-ec # Pegatron Chagall tablet device
> > > > +          - const: cypress,cg7153am
> > > > +      - items:
> > > > +          const: cypress,cg7153am
> > >
> > > Is this just some general purpose uC which could be used for anything
> > > and the interface exposed is Pegatron's invention. If so, then I'd drop
> > > the cypress,cg7153am compatible. What use would it be to software?
> > >
> >
> > Yeah, Cypress made an MPU, Pegatron used it as a base to make a fuel gauge.
> >
> > You propose smth like this?
> >
> >       - items:
> >           - enum:
> >               - pegatron,chagall-ec # Pegatron Chagall tablet device
> >           - const: cypress,cg7153am
> >
> > Without oneOf and second item or remove cypress,cg7153am entirely and
> > submit as pegatron,chagall-ec.yaml? Just to be clear.
> >
> > I am fine with removing oneOf and items: const: cypress,cg7153am, but
> > I would like to preserve cypress,cg7153am as second compatible since
> > this is an actual MCU model.
>
> I would just drop the cypress compatible entirely. It needs to be
> useful to a client (OS) in some way. If you said something like the
> firmware downloading is defined by Cypress or some other feature, then
> it would make sense. Otherwise, how this interface is implemented is
> irrelevant. I can't think of any other embedded controller where we
> have a compatible for the underlying MCU.
>

So I will move this schema to power supplies and name it
pegratron,chagall-ec.yaml along with suggested changes in the
compatible and descriptions.

> Rob