linux-kernel - Re: [PATCH v4 3/6] dt-bindings: power: Introduce properties to present the battery OCV capacity table

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Date:   Fri, 19 Oct 2018 09:50:51 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux PM list <linux-pm@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, yuanjiang.yu@...soc.com,
        Mark Brown <broonie@...nel.org>,
        Craig Tatlor <ctatlor97@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v4 3/6] dt-bindings: power: Introduce properties to
 present the battery OCV capacity table

On 19 October 2018 at 00:51, Rob Herring <robh@...nel.org> wrote:
> On Mon, Oct 15, 2018 at 04:09:22PM +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>
>> ---
>> 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..1f70e5d 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 battery capacity percent
>> +   with corresponding open circuit voltage (OCV) of the battery, which
>> +   is used to look up battery capacity according to current OCV value.
>> +   And the open circuit voltage unit is microvolt.
>
> The order percent and voltage is still not clear. I'd guess one way
> based on the text here, but the example is the opposite. The description
> here must stand on its own.

Yes, you are right. I will correct the order of ocv-capacity-table-n. Thanks.

>> + - 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
>>



-- 
Baolin Wang
Best Regards