linux-kernel - Re: [PATCH v1 1/4] dt-bindings: power: supply: maxim,max17040: update properties

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Date:   Wed, 8 Mar 2023 11:15:04 +0200
From:   Svyatoslav Ryhel <clamor95@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Iskren Chernev <me@...ren.info>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Matheus Castello <matheus@...tello.eng.br>,
        Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/4] dt-bindings: power: supply: maxim,max17040: update properties

ср, 8 бер. 2023 р. о 11:04 Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> пише:
>
> On 08/03/2023 09:44, Svyatoslav Ryhel wrote:
> > Add simple cell, status, health and temperature properties.
> >
> > Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
> > ---
> >  .../bindings/power/supply/maxim,max17040.yaml | 37 +++++++++++++++++++
> >  1 file changed, 37 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/power/supply/maxim,max17040.yaml b/Documentation/devicetree/bindings/power/supply/maxim,max17040.yaml
> > index 3a529326ecbd..6f1c25b4729f 100644
> > --- a/Documentation/devicetree/bindings/power/supply/maxim,max17040.yaml
> > +++ b/Documentation/devicetree/bindings/power/supply/maxim,max17040.yaml
> > @@ -55,6 +55,20 @@ properties:
> >    interrupts:
> >      maxItems: 1
> >
> > +  monitored-battery:
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +    description: phandle to the battery node being monitored
> > +
> > +  power-supplies: true
>
> This should be rather specific input name, e.g. vdd-supply.
>

it is not vdd it is actual charger device

> > +
> > +  io-channels:
> > +    items:
> > +      - description: battery temperature
>
>
>
> max17040 does not have ADC temperature input... so is it system
> configuration?
>

yes, I own a device (LG Optimus Vu P895) which uses max17043
coupled with ADC thermal sensor

> > +
> > +  io-channel-names:
> > +    items:
> > +      - const: temp
>
> Drop the names property, not needed for one item.
>

Alright, but driver patch expects temp name. I will look if this
is adjustable.

> > +
> >    wakeup-source:
> >      type: boolean
> >      description: |
> > @@ -95,3 +109,26 @@ examples:
> >          wakeup-source;
> >        };
> >      };
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/irq.h>
> > +    i2c0 {
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +
> > +      fuel-gauge@36 {
> > +        compatible = "maxim,max17043";
> > +        reg = <0x36>;
> > +
> > +        interrupt-parent = <&gpio>;
> > +        interrupts = <144 IRQ_TYPE_EDGE_FALLING>;
> > +
> > +        monitored-battery = <&battery>;
> > +        power-supplies = <&charger>;
>
> But here you suggests something else than VDD... The hardware does not
> take charger as input. It takes power supply - vdd.
>

Power system allows passing properties from other power devices.
In this case battery health and status are passed from charger.

> > +
> > +        io-channels = <&adc 8>;
>
> Just add these to existing example.
>

Not sure if it is a good idea, as you wish.

> > +        io-channel-names = "temp";
> > +
> > +        maxim,alert-low-soc-level = <10>;
> > +        wakeup-source;
> > +      };
> > +    };
>
> Best regards,
> Krzysztof
>

Best regards,
Svyatoslav R.