linux-kernel - Re: [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation

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Date:   Mon, 17 Sep 2018 11:43:30 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Sebastian Reichel <sebastian.reichel@...labora.com>
Cc:     Craig Tatlor <ctatlor97@...il.com>,
        Rob Herring <robh+dt@...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>
Subject: Re: [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge
 unit documentation

Hi Sebastian,

On 16 September 2018 at 21:57, Sebastian Reichel
<sebastian.reichel@...labora.com> wrote:
> Hi,
>
> On Wed, Sep 12, 2018 at 03:29:38PM +0800, Baolin Wang wrote:
>> This patch adds the binding documentation for Spreadtrum SC27XX series PMICs
>> fuel gauge unit device, which is used to calculate the battery capacity.
>>
>> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
>> ---
>>  .../devicetree/bindings/power/supply/sc27xx-fg.txt |   55 ++++++++++++++++++++
>>  1 file changed, 55 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt
>>
>> diff --git a/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt
>> new file mode 100644
>> index 0000000..7447bae
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt
>> @@ -0,0 +1,55 @@
>> +Spreadtrum SC27XX PMICs Fuel Gauge Unit Power Supply Bindings
>> +
>> +Required properties:
>> +- compatible: Should be one of the following:
>> +  "sprd,sc2720-fgu",
>> +  "sprd,sc2721-fgu",
>> +  "sprd,sc2723-fgu",
>> +  "sprd,sc2730-fgu",
>> +  "sprd,sc2731-fgu".
>> +- reg: The address offset of fuel gauge unit.
>> +- bat-detect-gpio: GPIO for battery detection.
>> +- io-channels: Specify the IIO ADC channel to get temperature.
>> +- io-channel-names: Should be "bat-temp".
>> +- sprd,inner-resist: Specify the the battery inner resistance (mOhm).
>
> This should be a property of the battery.without the sprd, prefix.

Right. But I did not find one proper property of the battery, so I
will add one new standard property of battery named
'inner-resistance-microohm' in next version. Is it OK for you?

>
>> +- sprd,ocv-cap-table: Provide the battery capacity percent with corresponding
>> +  open circuit voltage (ocv) of the battery, which is used to look up current
>> +  battery capacity according to current baterry ocv values.
>
> This should also be part of the battery binding. I just reviewed a
> patchset for the Qualcomm Battery Monitoring System, which needs the
> same functionality. The Qualcomm binding is more advanced, but
> should also support this simpler case. Thus I think it makes sense
> to use its description as base for adding support for this feature
> to Documentation/devicetree/bindings/power/supply/battery.txt

That's great. But could you give me the link of Qualcomm binding,
which I can change my bindings. Thanks for your comments.

-- 
Baolin Wang
Best Regards