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

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Date:   Wed, 8 Mar 2023 12:51:46 +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 12:44 Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> пише:
>
> On 08/03/2023 10:15, Svyatoslav Ryhel wrote:
>
> >> 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.
>
> I think I saw cases without names.
>

There is no io-channel without a name. And io-channels are mostly used
by power supply devices.

> >
> >>> +
> >>>    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.
>
> So this is not an input to device? Then it does not really look like
> property of this hardware. Fuel gauge does not control the charger, also
> from system configuration point of view.
>

It is not controlling charger, the charger provides the status and
health of the battery to the fuel gauge. This option is also used in
other fuel gauges.

> Best regards,
> Krzysztof
>