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

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Date:   Thu, 26 Apr 2018 13:39:50 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Craig Tatlor <ctatlor97@...il.com>
Cc:     linux-arm-msm@...r.kernel.org, Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...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>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] dt-bindings: power: supply: qcom_bms: Add bindings

On Sat, Apr 7, 2018 at 3:46 PM, Craig Tatlor <ctatlor97@...il.com> wrote:

This is very interesting bindings!

> Add bindings for the Qualcomm battery measurement system.
>
> Signed-off-by: Craig Tatlor <ctatlor97@...il.com>

Please expand on acronyms as requested by Rob.

> +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".

These are fine (and good) as bindings go.

> +- qcom,fcc-temp-legend:     An array containing the temperature, in degC,
> +                           for each column of the FCC lookup table.
> +- 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.

I wonder if these are really Qualcomm-specific.

Can't we just cut the "qcom,*" prefix from all and simply define
these lookup tables in a way (with units) that makes sense to all
kinds of battery capacities?

Maybe spell them out though and avoid the abbreviations.

Just put those in the already existing
Documentation/devicetree/bindings/power/supply/battery.txt
so others can reuse them from there.

You will see that those bindings does not abbreviate but
spells out the natural sciences definitions to it's a bliss to
read for everyone.

Yours,
Linus Walleij