linux-kernel - Re: [PATCH] smb347_charger: Cleanup power supply registration code in probe

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Date:	Thu, 19 Apr 2012 14:18:24 +0300
From:	Mika Westerberg <mika.westerberg@....fi>
To:	"Pallala, Ramakrishna" <ramakrishna.pallala@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Anton Vorontsov <cbouatmailru@...il.com>,
	Anton Vorontsov <anton.vorontsov@...aro.org>
Subject: Re: [PATCH] smb347_charger: Cleanup power supply registration code in probe

On Thu, Apr 19, 2012 at 2:10 PM, Pallala, Ramakrishna
<ramakrishna.pallala@...el.com> wrote:
>> Sent: Thursday, April 19, 2012 12:41 PM
>> To: Pallala, Ramakrishna
>> Cc: linux-kernel@...r.kernel.org; Anton Vorontsov; Anton Vorontsov
>> Subject: Re: [PATCH] smb347_charger: Cleanup power supply registration code in probe
>>
>> On Fri, Apr 13, 2012 at 03:14:52PM +0530, Ramakrishna Pallala wrote:
>> > This patch checks if the usb or mains charging is enabled by the
>> > platform before registering with the power supply class.
>>
>> Can you describe why this change is needed? The current code always registers all the
>> power-supplies but if we haven't enabled for example USB charging, then the online
>> property for USB ps is set to 0.
>
> If we haven't enabled USB charging then why to waste kernel resources?
> What we will gain by registering with power supply class if USB charging is not enabled?

For one we have a consistent interface to userspace regardless of how
the platform has configured the driver. For example if USB charging is
not enabled userspace can still see the 'smb347-usb' directory but
'online' attribute is always set to zero.
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