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

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Date:   Thu, 20 Sep 2018 02:46:12 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Baolin Wang <baolin.wang@...aro.org>
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,

On Mon, Sep 17, 2018 at 11:43:30AM +0800, Baolin Wang wrote:
> 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

Thanks.

> named 'inner-resistance-microohm' in next version. Is it OK for you?

The proper suffix is -micro-ohms according to
Documentation/devicetree/bindings/property-units.txt

Also the proper English term is internal resistance as far
as I know (and Wikipedia also names it this way), so I
suggest to name the property 'internal-resistance-micro-ohms'.

> >> +- 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.

https://patchwork.kernel.org/patch/10464633/

-- Sebastian

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