linux-kernel - Re: [PATCH v3 2/5] dt-bindings: power: supply: Max17040: Add low level SOC alert threshold

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Date:   Wed, 29 May 2019 16:40:15 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Matheus Castello <matheus@...tello.eng.br>
Cc:     sre@...nel.org, robh+dt@...nel.org, mark.rutland@....com,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Bartłomiej Żołnierkiewicz 
        <b.zolnierkie@...sung.com>, lee.jones@...aro.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/5] dt-bindings: power: supply: Max17040: Add low
 level SOC alert threshold

On Mon, 27 May 2019 at 04:45, Matheus Castello <matheus@...tello.eng.br> wrote:
>
> For configure low level state of charge threshold alert signaled from
> max17040 we add "maxim,alert-low-soc-level" property.
>
> Signed-off-by: Matheus Castello <matheus@...tello.eng.br>
> ---
>  .../power/supply/max17040_battery.txt         | 28 +++++++++++++++++++
>  1 file changed, 28 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/power/supply/max17040_battery.txt
>
> diff --git a/Documentation/devicetree/bindings/power/supply/max17040_battery.txt b/Documentation/devicetree/bindings/power/supply/max17040_battery.txt
> new file mode 100644
> index 000000000000..a13e8d50ff7b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/supply/max17040_battery.txt
> @@ -0,0 +1,28 @@
> +max17040_battery
> +~~~~~~~~~~~~~~~~
> +
> +Required properties :
> + - compatible : "maxim,max17040" or "maxim,max77836-battery"
> +
> +Optional properties :
> +- maxim,alert-low-soc-level :  The alert threshold that sets the state of
> +                               charge level (%) where an interrupt is
> +                               generated. Can be configured from 1 up to 32
> +                               (%). If skipped the power up default value of
> +                               4 (%) will be used.
> +- interrupts :                         Interrupt line see Documentation/devicetree/
> +                               bindings/interrupt-controller/interrupts.txt

Based on driver's behavior, I understand that these two properties
come in pair so maxim,alert-low-soc-level (or its default value) will
be used if and only if interrupts property is present. Maybe mention
this? In general looks fine to me:
Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>

Best regards,
Krzysztof

> +- wakeup-source :              This device has wakeup capabilities. Use this
> +                               property to use alert low SOC level interrupt
> +                               as wake up source.
> +
> +Example:
> +
> +       battery-fuel-gauge@36 {
> +               compatible = "maxim,max17040";
> +               reg = <0x36>;
> +               maxim,alert-low-soc-level = <10>;
> +               interrupt-parent = <&gpio7>;
> +               interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
> +               wakeup-source;
> +       };
> --
> 2.20.1
>