linux-kernel - Re: [PATCH v4 2/3] dt-bindings: power: supply: qcom

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Date:   Wed, 18 Apr 2018 16:16:46 -0500
From:   Rob Herring <robh@...nel.org>
To:     Craig Tatlor <ctatlor97@...il.com>
Cc:     linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Sebastian Reichel <sre@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Randy Dunlap <rdunlap@...radead.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/3] dt-bindings: power: supply: qcom_bms: Add bindings

On Sun, Apr 15, 2018 at 7:55 AM, Craig Tatlor <ctatlor97@...il.com> wrote:
> On Fri, Apr 13, 2018 at 11:35:27AM -0500, Rob Herring wrote:
>> On Sat, Apr 07, 2018 at 06:57:45PM +0100, Craig Tatlor wrote:
>> > Add bindings for the Qualcomm Battery Monitoring system.
>> >
>> > Signed-off-by: Craig Tatlor <ctatlor97@...il.com>
>> > ---
>> >  .../bindings/power/supply/qcom_bms.txt        | 93 +++++++++++++++++++
>> >  1 file changed, 93 insertions(+)
>> >  create mode 100644 Documentation/devicetree/bindings/power/supply/qcom_bms.txt
>> >
>> > diff --git a/Documentation/devicetree/bindings/power/supply/qcom_bms.txt b/Documentation/devicetree/bindings/power/supply/qcom_bms.txt
>> > new file mode 100644
>> > index 000000000000..6296399edc09
>> > --- /dev/null
>> > +++ b/Documentation/devicetree/bindings/power/supply/qcom_bms.txt
>> > @@ -0,0 +1,93 @@
>> > +Qualcomm Battery Measurement System
>> > +
>> > +The Qualcomm Battery Measurement System is found inside of Qualcomm PM8941
>>
>> Is it Monitoring or Measurment?
>>
>> > +PMICs. It provides OCV and coulomb counter registers that allow the kernel
>> > +to infer a capacity level.
>>
>> s/kernel/OS/
>>
>> OCV?
>>
>> > +
>> > +Required properties:
>> > +- compatible:               Should contain "qcom,pm8941-bms".
>> > +- reg:                      Specifies the SPMI address and length of the
>> > +                       controller's registers.
>> > +- interrupts:               OCV threshold interrupt.
>> > +- io-channels:              Should contain IIO channel specifier for the
>> > +                       ADC channel that reports battery temperature.
>> > +- io-channel-names:         Should contain "temp".
>> > +- qcom,fcc-temp-legend:     An array containing the temperature, in degC,
>> > +                       for each column of the FCC lookup table.
>>
>> What's FCC?
>>
>> > +- qcom,fcc-lut:             An array of FCC values in mah, one entry for each
>> > +                       temperature defined in in qcom,fcc-temp-legend.
>> > +- qcom,ocv-temp-legend:     An array containing the temperature, in degC,
>> > +                       for each column of the OCV lookup table.
>> > +- qcom,ocv-capacity-legend: An array containing the capacity for each
>> > +                       row of the OCV lookup table.
>> > +- qcom,ocv-lut:             An array of OCV values in mV, one entry for each
>> > +                       capacity defined in qcom,ocv-capacity-legend.
>>
>> Need to specify the sizes of these if not 32-bit.
>>
>> All these seem to have units, so add unit suffixes as defined in
>> property-units.txt.
> Should i change code to use microamphours & microvolts or add a new
> suffix?

It is preferred to use the existing ones unless you have some
justification to add new ones.

Rob