linux-kernel - Re: [PATCH 4/4] RX-51: Add platform function and data for bq24150a charger

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Message-Id: <201309241905.48301@pali>
Date:	Tue, 24 Sep 2013 19:05:47 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Tony Lindgren <tony@...mide.com>, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	freemangordon@....bg, aaro.koskinen@....fi, pavel@....cz
Subject: Re: [PATCH 4/4] RX-51: Add platform function and data for bq24150a charger

On Monday 23 September 2013 22:47:15 Sebastian Reichel wrote:
> On Mon, Sep 23, 2013 at 10:06:46PM +0200, Pali Rohár wrote:
> > On Monday 23 September 2013 22:00:09 Sebastian Reichel wrote:
> > > On Mon, Sep 23, 2013 at 09:16:18PM +0200, Pali Rohár wrote:
> > > > It is not as simple as it looks. This is reason why I
> > > > submited this patch long time after I submited bq2415x
> > > > driver.
> > > > 
> > > > Problem is that for rx51 is needed specific function
> > > > which connect to two drivers (bq2415x and isp1704) plus
> > > > it call specific rx51 board functions.
> > > > 
> > > > Something which cannot be in DT (unless DT support C/ASM
> > > > code).
> > > 
> > > mh could isp1704 driver expose the data via the regulator
> > > framework?
> > 
> > No, isp1704 is power supply driver and export data via power
> > supply (sysfs) interface. It is not regulator but charger
> > driver.
> 
> well it does not charge the battery directly, but just
> provides a power line with 5 Volt and a specified amount of
> current to the system, doesn't it?
> 

No, isp1704 driver is doing fastcharger detection (and then 
export charger type via sysfs power supply) based on musb usb 
events.

Real charging (enabling/disabling and setting properties) is done 
by bq24150a chip which has own power driver bq2415x_charger.

As already wrote this is not simple and this is reason why I sent 
board data and functions only now...

> From my POV this is a candiate for the regulator framework:
> 
> https://www.kernel.org/doc/Documentation/power/regulator/overv
> iew.txt
> 
> -- Sebastian

-- 
Pali Rohár
pali.rohar@...il.com

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