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

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Message-ID: <20140227204636.GA5053@amd.pavel.ucw.cz>
Date:	Thu, 27 Feb 2014 21:46:37 +0100
From:	Pavel Machek <pavel@....cz>
To:	Jenny Tc <jenny.tc@...el.com>
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 Wed 2014-02-26 08:24:44, Jenny Tc wrote:
> 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.

Yes please. Because with current description, user has no chance.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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