linux-kernel - Re: [PATCH V4] drivers/rtc/rtc-palmas.c: support for backup battery charging

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Date:	Thu, 8 Aug 2013 22:47:50 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Mark Rutland <mark.rutland@....com>
CC:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rtc-linux@...glegroups.com" <rtc-linux@...glegroups.com>,
	"gg@...mlogic.co.uk" <gg@...mlogic.co.uk>,
	"kishon@...com" <kishon@...com>,
	Stephen Warren <swarren@...dia.com>,
	Pawel Moll <Pawel.Moll@....com>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
	"broonie@...nel.org" <broonie@...nel.org>
Subject: Re: [PATCH V4] drivers/rtc/rtc-palmas.c: support for backup battery
 charging

On Thursday 08 August 2013 03:03 PM, Mark Rutland wrote:
> On Wed, Aug 07, 2013 at 07:46:11PM +0100, Laxman Dewangan wrote:
>>> What happens if we charge at the wrong current?
>> Not much sure but I think it can create battery damage.
> If we charge a battery supporting >100mA at a current <100mA, will that
> cause damage? Or only if we charge above it's supported current?

Over-current charging can only damage. Lower charging current will not 
damage, just will take more time to charge.

>
> If the latter's true, it might make sense to invert the condition and
> describe that the battery may be charged at a higher current, with the
> default being <100mA. That way a missing property in the dt will only
> result in sub-optimal charging rather than battery damage.
>
Ok, fine with this. In this case property will be 
"ti,backup-battery-charge-high-current".


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