Message-id: <1391604574.3726.20.camel@AMDC1943>
Subject: Re: [PATCH 16/18] charger: max14577: Add support for MAX77836 charger
From: Krzysztof Kozlowski <k.kozlowski@samsung.com>
To: Jenny Tc <jenny.tc@intel.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>,
        Chanwoo Choi <cw00.choi@samsung.com>,
        Samuel Ortiz <sameo@linux.intel.com>, Lee Jones <lee.jones@linaro.org>,
        Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org>,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Kyungmin Park <kyungmin.park@samsung.com>,
        Anton Vorontsov <anton@enomsg.org>,
        Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>,
        David Woodhouse <dwmw2@infradead.org>
Date: Wed, 05 Feb 2014 13:49:34 +0100
In-reply-to: <20140203113031.GA8848@jenny-desktop>
References: <1390911522-28209-1-git-send-email-k.kozlowski@samsung.com>
 <1390911522-28209-17-git-send-email-k.kozlowski@samsung.com>
 <20140203113031.GA8848@jenny-desktop>
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Sender: linux-kernel-owner@vger.kernel.org

Hi,

On Mon, 2014-02-03 at 17:00 +0530, Jenny Tc wrote:
> On Tue, Jan 28, 2014 at 01:18:40PM +0100, Krzysztof Kozlowski wrote:
> > -	/* Battery-Charger Constant Voltage (CV) Mode, from SM-V700: 4.35V */
> > +	/* Battery-Charger Constant Voltage (CV) Mode, set to: 4.35V */
> 
> Does this charger chip support only 4.35V batteries? If the CV is hard coded
> to 4.35V, it's not safe for 4.2V batteries.
> 
> > +	/* End-of-Charge Current, set to 50mA (max14577) / 7.5mA (max77836) */
> The End of charge current basically depend on battery and not on charger chip.
> 
> > -	/* Overvoltage-Protection Threshold, from SM-V700: 6.5V */
> > +	/* Overvoltage-Protection Threshold, set to 6.5V */
> 6.5V as over voltage for battery? A 4.35V battery would have exploded by
> that time!

Currently the max14577 driver has all these values hard-coded. This
patch doesn't change this, it only adds support for max77836. I agree
with you that hard-coding these values is not a proper way of doing
this.

I'll add another patch for parsing these values from DTS.

Best regards,
Krzysztof


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