linux-kernel - Re: [PATCH] i2c: exynos5: Initialise Samsung High Speed I2C controller early

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Date:	Fri, 25 Apr 2014 10:28:06 +0530
From:	Tushar Behera <tushar.behera@...aro.org>
To:	Mark Brown <broonie@...nel.org>,
	Naveen Krishna Chatradhi <ch.naveen@...sung.com>
CC:	linux-i2c@...r.kernel.org, naveenkrishna.ch@...il.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, sjg@...omium.org,
	grundler@...omium.org, linux-kernel@...r.kernel.org,
	wsa@...-dreams.de, cpgs@...sung.com
Subject: Re: [PATCH] i2c: exynos5: Initialise Samsung High Speed I2C controller
 early

On 04/24/2014 09:55 PM, Mark Brown wrote:
> On Thu, Apr 24, 2014 at 08:18:36PM +0530, Naveen Krishna Chatradhi wrote:
>> This patch moves initialization code to subsys_initcall() to ensure
>> that the i2c bus is available early so the regulators can be quickly
>> probed and available for other devices on their probe() call.
> 
>> Such solution has been proposed by Mark Brown to fix the problem of
>> the regulators not beeing available on the peripheral device probe():
>> http://lists.infradead.org/pipermail/linux-arm-kernel/2010-March/011971.html
> 
> What specifically is this needed for?  We *should* be able to use
> deferred probe for most things, but I know that not all subsystems are
> able to yet.
> 

DRM-Exynos is one such sub-system right now that doesn't handle deferred
probe well. That is one of the reasons for this patch.

-- 
Tushar Behera
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