linux-kernel - Re: [PATCH 1/3] iio: core: Add devm_ APIs for iio_channel

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Message-ID: <57052432.8070700@nvidia.com>
Date:	Wed, 6 Apr 2016 20:28:58 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Daniel Baluta <daniel.baluta@...il.com>
CC:	Jonathan Cameron <jic23@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	"Peter Meerwald-Stadler" <pmeerw@...erw.net>,
	<linux-doc@...r.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
Subject: Re: [PATCH 1/3] iio: core: Add devm_ APIs for iio_channel_{get,release}

Hi Daniel,


On Wednesday 06 April 2016 07:19 PM, Daniel Baluta wrote:
> On Wed, Apr 6, 2016 at 1:31 PM, Laxman Dewangan <ldewangan@...dia.com> wrote:
>> Some of kernel driver uses the IIO framework to get the sensor
>> value via ADC or IIO HW driver. The client driver get iio channel
>> by iio_channel_get() and release it by calling iio_channel_release().
>>
>> Add resource managed version (devm_*) of these APIs so that if client
>> calls the devm_iio_channel_get() then it need not to release it explicitly,
>> it can be done by managed device framework when driver get un-binded.
>>
>> This reduces the code in error path and also need of .remove callback in
>> some cases.
>>
> Please provide at least one example of code that uses this API.

Most of client for this APIs are in other subsystem.
When I was working on the patch
[PATCH 2/2] thermal: generic-adc: Add ADC based thermal sensor driver

if I have devm_iio_channel_get() then I can get .remove callback at all.

I did not use this new APIs in my patch because they are in different 
subsystem.