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

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Message-ID: <CAPVz0n3=-QL1_NGP31WX_4LQBt5-T47BbU_yn6td1zk9C2T=iA@mail.gmail.com>
Date: Mon, 24 Mar 2025 19:05:58 +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

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.

Thanks.

> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  monitored-battery: true
> > +  power-supplies: true
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +
> > +unevaluatedProperties: false
> > +
> > +examples:
> > +  - |
> > +    i2c {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        embedded-controller@10 {
> > +            compatible = "pegatron,chagall-ec", "cypress,cg7153am";
> > +            reg = <0x10>;
> > +
> > +            monitored-battery = <&battery>;
> > +            power-supplies = <&mains>;
> > +        };
> > +    };
> > +...
> > --
> > 2.43.0
> >