linux-kernel - Re: [PATCH 2/3] dt-bindings: power: supply: Document Mitsumi MM8013 fuel gauge

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Date:   Thu, 22 Jun 2023 02:51:50 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Sebastian Reichel <sre@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: power: supply: Document Mitsumi MM8013
 fuel gauge

On 21.06.2023 18:38, Krzysztof Kozlowski wrote:
> On 21/06/2023 17:39, Konrad Dybcio wrote:
>> The Mitsumie MM8013 is an I2C fuel gauge for Li-Ion cells. The partial
> 
> Mitsumi
> 
>> datasheet is available at [1]. Add bindings for this chip.
>>
>> [1] https://www.mitsumi.co.jp/latest-M/Catalog/pdf/battery_mm_8013_e.pdf
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>  .../bindings/power/supply/mitsumi,mm8013.yaml      | 35 ++++++++++++++++++++++
>>  1 file changed, 35 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/power/supply/mitsumi,mm8013.yaml b/Documentation/devicetree/bindings/power/supply/mitsumi,mm8013.yaml
>> new file mode 100644
>> index 000000000000..080fd44083ac
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/power/supply/mitsumi,mm8013.yaml
>> @@ -0,0 +1,35 @@
>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/power/supply/mitsumi,mm8013.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Mitsumi MM8013 fuel gauge
>> +
>> +maintainers:
>> +  - Konrad Dybcio <konradybcio@...nel.org>
>> +
>> +properties:
>> +  compatible:
>> +    const: mitsumi,mm8013
>> +
>> +  reg:
>> +    maxItems: 1
> 
> 
> I think you miss several properties: three power supplies (although not
> all might be needed) and most likely monitored-battery. One regulator
> output and output GPIO probably can be skipped.
Looking at the example circuit, it seems like the chip's power lines are
hardwired to the battery cell.

monitored-battery does not seem useful today, as we don't have any
information about writing values onto the chip :/ And I'm not willing
to experiment with that! :P

Konrad
> 
> Best regards,
> Krzysztof
>