linux-kernel - Re: [RFC PATCH v3 1/9] dt-bindings: battery: Add temperature-capacity degradation table

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Date:   Thu, 18 Nov 2021 02:57:23 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc:     Matti Vaittinen <mazziesaccount@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Lee Jones <lee.jones@...aro.org>, rostokus@...il.com,
        fan.chen@...iatek.com, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-power@...rohmeurope.com
Subject: Re: [RFC PATCH v3 1/9] dt-bindings: battery: Add temperature-capacity
 degradation table

On Tue, Nov 16, 2021 at 1:24 PM Matti Vaittinen
<matti.vaittinen@...rohmeurope.com> wrote:

> Some charger/battery vendors describe the temperature impact to
> battery capacity by providing tables with capacity change at
> given temperature. Support providing this temperature - capacity
> dependency using the simple-battery DT nodes.
>
> Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>

Since we already support providing the capacity at different
temperatures using ocv-capacity-celsius and the array of
arrays ocv-capacity-table-0, 1, 2... you are introducing a
second parallel method of describing how capacity changes
in accordance with temperature, right?

What do you expect to happen if someone specifies both?

If this is an either/or situation then the schema has to
guarantee the exclusiveness for each.

(I would probably just use the formula you have to calculate
a few tables using the existing method but that's just me.)

Yours,
Linus Walleij