linux-kernel - Re: [PATCH 3/4] power_supply: Introduce PSE compliant algorithm

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Message-ID: <20140226025444.GA21449@jenny-desktop>
Date:	Wed, 26 Feb 2014 08:24:44 +0530
From:	Jenny Tc <jenny.tc@...el.com>
To:	Pavel Machek <pavel@....cz>
Cc:	linux-kernel@...r.kernel.org,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	Anton Vorontsov <cbouatmailru@...il.com>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	Kim Milo <Milo.Kim@...com>, Lee Jones <lee.jones@...aro.org>,
	Jingoo Han <jg1.han@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Pali Rohár <pali.rohar@...il.com>,
	Rhyland Klein <rklein@...dia.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	David Woodhouse <dwmw2@...radead.org>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	Sebastian Reichel <sre@...g0.de>, aaro.koskinen@....fi,
	Pallala Ramakrishna <ramakrishna.pallala@...el.com>,
	freemangordon@....bg, linux-omap@...r.kernel.org
Subject: Re: [PATCH 3/4] power_supply: Introduce PSE compliant algorithm

On Fri, Feb 21, 2014 at 03:45:29PM +0100, Pavel Machek wrote:
> On Thu 2014-02-20 10:46:55, Jenny Tc wrote:
> > On Tue, Feb 04, 2014 at 12:36:40PM +0100, Pavel Machek wrote:
> > > > --- a/drivers/power/Kconfig
> > > > +++ b/drivers/power/Kconfig
> > > > @@ -22,6 +22,19 @@ config POWER_SUPPLY_CHARGER
> > > >  	  drivers to keep the charging logic outside and the charger driver
> > > >  	  just need to abstract the charger hardware.
> > > >  
> > > > +config POWER_SUPPLY_CHARGING_ALGO_PSE
> > > > +	bool "PSE compliant charging algorithm"
> > > > +	help
> > > > +	  Say Y here to select Product Safety Engineering (PSE) compliant
> > > > +	  charging algorithm. As per PSE standard the battery characteristics
> > > > +	  and thereby the charging rates can vary on different temperature
> > > > +	  zones. This config will enable PSE compliant charging algorithm with
> > > > +	  maintenance charging support. At runtime the algorithm will be
> > > > +	  selected by the psy charger driver based on the type of the battery
> > > > +	  charging profile.
> > > 
> > > Information where to expect PSE compliant chargers would be nice.
> > 
> > This algorithm can be used with non PSE compliant chargers also. This is a SW
> > based charging algorithm.
> 
> Ok, but you need to explain for the users when it might be good idea
> to select this option...
> 
> Or maybe this should not be user configurable and drivers should just
> select it?

The idea is to allow pluggable charging algorithms. Currently we have only one
charging algorithm proposed, but can have other charging algorithms (like pulse
charging, rule based charging etc.). Based on the platform need, the algorithms
can be selected. So this should be a user configurable option. I can add more
explanation on when to select this option.
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