linux-kernel - Re: [PATCH v1 5/6] dt-bindings: mfd: ene-kb3930: Document power-supplies and monitored-battery properties

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Date:   Sun, 23 Aug 2020 20:00:41 +0200
From:   Lubomir Rintel <lkundrak@...sk>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Sebastian Reichel <sre@...nel.org>, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 5/6] dt-bindings: mfd: ene-kb3930: Document
 power-supplies and monitored-battery properties

Hi,

On Sun, Aug 23, 2020 at 05:08:45PM +0300, Dmitry Osipenko wrote:
> Battery could be connected to the controller and in this case controller
> will provide a battery-monitor function.
> 
> The power-supplies phandle property is needed in order to describe the
> power supply which is used for charging of the battery, this allows to
> determine whither battery is charging or discharging, depending on the
> supply state.
> 
> The monitored-battery phandle provides information about the battery cell
> characteristics.

I believe it would be better if you created a new binding document
instead of reusing this one -- the hardware part iseems to be a
different one and the firmware it runs seems to be behaving totally
differently than the usual ENE firmware [1].

[1] This eneec.c seems to be coming from ENE, so I'm assuming it's a
    good enough description of how their firmware behaves:
    https://git.kernel.org/pub/scm/linux/kernel/git/lkundrak/linux-mmp3-dell-ariel.git/tree/drivers/input/serio/eneec.c

Cheers
Lubo

> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  .../devicetree/bindings/mfd/ene-kb3930.yaml    | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/ene-kb3930.yaml b/Documentation/devicetree/bindings/mfd/ene-kb3930.yaml
> index 5a1c4a959d9c..435728054f3a 100644
> --- a/Documentation/devicetree/bindings/mfd/ene-kb3930.yaml
> +++ b/Documentation/devicetree/bindings/mfd/ene-kb3930.yaml
> @@ -29,6 +29,8 @@ properties:
>      description: GPIO used with the shutdown protocol on Ariel
>      maxItems: 2
>  
> +  monitored-battery: true
> +  power-supplies: true
>    system-power-controller: true
>  
>  required:
> @@ -41,6 +43,19 @@ examples:
>    - |
>      #include <dt-bindings/gpio/gpio.h>
>  
> +    battery: battery-cell {
> +            compatible = "simple-battery";
> +            charge-full-design-microamp-hours = <3260000>;
> +            energy-full-design-microwatt-hours = <24000000>;
> +            operating-range-celsius = <0 40>;
> +    };
> +
> +    mains: ac-adapter {
> +      compatible = "gpio-charger";
> +      charger-type = "mains";
> +      gpios = <&gpio 125 GPIO_ACTIVE_LOW>;
> +    };
> +
>      i2c {
>        #address-cells = <1>;
>        #size-cells = <0>;
> @@ -52,6 +67,9 @@ examples:
>  
>          off-gpios = <&gpio 126 GPIO_ACTIVE_HIGH>,
>                      <&gpio 127 GPIO_ACTIVE_HIGH>;
> +
> +        monitored-battery = <&battery>;
> +        power-supplies = <&mains>;
>        };
>      };
>  
> -- 
> 2.27.0
>