linux-kernel - Re: [PATCH RESEND 1/3 v4] drivers:power:twl4030-charger: don't check if battery is present

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Date:   Wed, 3 May 2017 14:20:29 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Cc:     Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Grazvydas Ignotas <notasas@...il.com>,
        Andreas Kemnade <andreas@...nade.info>,
        linux-pm@...r.kernel.org, letux-kernel@...nphoenux.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND 1/3 v4] drivers:power:twl4030-charger: don't check if battery is present


> Am 01.05.2017 um 13:26 schrieb Sebastian Reichel <sebastian.reichel@...labora.co.uk>:
> 
> Hi,
> 
> On Fri, Apr 14, 2017 at 09:29:38PM +0200, H. Nikolaus Schaller wrote:
>> We can't assume that the battery is or stays present after probing
>> on devices with replaceable battery.
>> 
>> On some devices (e.g. GTA04 or OpenPanodra) it can be removed
>> and even be hot swapped by the user while device continues to operate
>> through external AC or USB power (as long as system power consumption
>> remains below ca. 500mA as provided by USB). Under certain conditions
>> it is possible to boot without battery.
>> 
>> So it makes no sense to check for this situation during probe and make
>> the charger driver (and its status reports) completely non-operational if
>> the battery can be inserted later.
>> 
>> Tested on: GTA04 and OpenPandora.
>> 
>> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> 
> Thanks, queued.

TNX,
Nikolaus


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