linux-kernel - Re: [PATCH v5 3/6] dt-bindings: power: Introduce properties to present the battery OCV capacity table

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Message-ID: <20181021162430.qfz2teauewdy5jva@earth.universe>
Date:   Sun, 21 Oct 2018 18:24:30 +0200
From:   Sebastian Reichel <sre@...nel.org>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     robh+dt@...nel.org, mark.rutland@....com, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        yuanjiang.yu@...soc.com, broonie@...nel.org, ctatlor97@...il.com,
        linus.walleij@...aro.org
Subject: Re: [PATCH v5 3/6] dt-bindings: power: Introduce properties to
 present the battery OCV capacity table

Hi,

On Fri, Oct 19, 2018 at 06:53:12PM +0800, Baolin Wang wrote:
> Some battery driver will use the open circuit voltage (OCV) value to look
> up the corresponding battery capacity percent in one certain degree Celsius.
> Thus this patch provides some battery properties to present the OCV table
> temperatures and OCV capacity table values.
> 
> Suggested-by: Sebastian Reichel <sre@...nel.org>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> ---

Looks good to me.

-- Sebastian

> Changes from v4:
>  - Improve the description of ocv-capacity-table-n to make the order clear.
> 
> Changes from v3:
>  - Split binding into one separate patch.
>  - Rename ocv-capacity-table-temperatures to ocv-capacity-celsius.
>  - Add some words to specify the OCV's unit.
> 
> Changes from v2:
>  - Use type __be32 to calculate the table length.
>  - Update error messages.
>  - Add some helper functions.
> 
> Changes from v1:
>  - New patch in v2.
> ---
>  .../devicetree/bindings/power/supply/battery.txt   |   15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/power/supply/battery.txt b/Documentation/devicetree/bindings/power/supply/battery.txt
> index 938d027..89871ab 100644
> --- a/Documentation/devicetree/bindings/power/supply/battery.txt
> +++ b/Documentation/devicetree/bindings/power/supply/battery.txt
> @@ -23,6 +23,17 @@ Optional Properties:
>   - constant-charge-current-max-microamp: maximum constant input current
>   - constant-charge-voltage-max-microvolt: maximum constant input voltage
>   - factory-internal-resistance-micro-ohms: battery factory internal resistance
> + - ocv-capacity-table-0: An array providing the open circuit voltage (OCV)
> +   of the battery and corresponding battery capacity percent, which is used
> +   to look up battery capacity according to current OCV value. And the open
> +   circuit voltage unit is microvolt.
> + - ocv-capacity-table-1: Same as ocv-capacity-table-0
> + ......
> + - ocv-capacity-table-n: Same as ocv-capacity-table-0
> + - ocv-capacity-celsius: An array containing the temperature in degree Celsius,
> +   for each of the battery capacity lookup table. The first temperature value
> +   specifies the OCV table 0, and the second temperature value specifies the
> +   OCV table 1, and so on.
>  
>  Battery properties are named, where possible, for the corresponding
>  elements in enum power_supply_property, defined in
> @@ -44,6 +55,10 @@ Example:
>  		constant-charge-current-max-microamp = <900000>;
>  		constant-charge-voltage-max-microvolt = <4200000>;
>  		factory-internal-resistance-micro-ohms = <250000>;
> +		ocv-capacity-celsius = <(-10) 0 10>;
> +		ocv-capacity-table-0 = <4185000 100>, <4113000 95>, <4066000 90>, ...;
> +		ocv-capacity-table-1 = <4200000 100>, <4185000 95>, <4113000 90>, ...;
> +		ocv-capacity-table-2 = <4250000 100>, <4200000 95>, <4185000 90>, ...;
>  	};
>  
>  	charger: charger@11 {
> -- 
> 1.7.9.5
> 

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