linux-kernel - Re: [PATCH v3 01/18] dt-bindings: power: battery: add constant-charge-current property

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Message-Id: <20170215004646.23607-1-liam@networkimprov.net>
Date:   Tue, 14 Feb 2017 16:46:46 -0800
From:   Liam Breck <liam@...workimprov.net>
To:     knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        robh+dt@...nel.org, mark.rutland@....com, wens@...e.org,
        sre@...nel.org, linux@...linux.org.uk,
        maxime.ripard@...e-electrons.com, lee.jones@...aro.org
Cc:     Quentin Schulz <quentin.schulz@...e-electrons.com>,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        thomas.petazzoni@...e-electrons.com, icenowy@...c.xyz,
        bonbons@...ux-vserver.org
Subject: Re: [PATCH v3 01/18] dt-bindings: power: battery: add constant-charge-current property


On Tue, 14 Feb 2017 10:40:55 +0100 Quentin Schulz wrote:
> This adds the constant-charge-current property to the list of optional
> properties of the battery.
>
> The constant charge current is critical for batteries as they can't
> handle all charge currents.
>
> Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
> ---
>
> added in v3
>
>  Documentation/devicetree/bindings/power/supply/battery.txt | 2 ++

Is constant-charge-current dependent on the battery (e.g. capacity, nominal voltage, etc) or the 
system (charger chip, input current/voltage, etc)?

It belongs in Doc.../power/supply/battery.txt if it's a characteristic of the battery.

Note, this page asserts that constant-current charging applies to NiMH batteries:
http://power-topics.blogspot.com/2016/05/constant-voltage-constant-current.html

Related properties to be added to battery.txt near-future in a patchset for the BQ24190 
charger are as follows. These are not currently in enum power_supply_property, so the actual names 
are still to be decided.

precharge-current-microamp:
   maximum charge current during precharge phase (typically 20% of battery capacity)

termination-current-microamp (or endcharge-current):
   a charge cycle terminates when the battery voltage is above recharge threshold,
   and the current is below this setting (typically 10% of battery capacity)


~.~