linux-kernel - Re: [PATCH v3 1/5] i2c: mv64xxx: Add reset deassert call

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Date:	Fri, 7 Mar 2014 11:07:51 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Wolfram Sang <wsa@...-dreams.de>, linux-kernel@...r.kernel.org,
	zhuzhenhua@...winnertech.com, linux-sunxi@...glegroups.com,
	kevin.z.m.zh@...il.com, sunny@...winnertech.com,
	shuge@...winnertech.com, linux-arm-kernel@...ts.infradead.org,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH v3 1/5] i2c: mv64xxx: Add reset deassert call

Hi Russell,

On Fri, Mar 07, 2014 at 09:52:23AM +0000, Russell King - ARM Linux wrote:
> On Tue, Mar 04, 2014 at 05:28:37PM +0100, Maxime Ripard wrote:
> > The Allwinner A31 SoC using that IP has a reset controller maintaining
> > it reset unless told otherwise.
> > 
> > Add some optional reset support to the driver.
> > 
> > Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> > Reviewed-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> > Tested-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> 
> This appears to be causing some build errors in Olof's next builder
> for many of the ARM platforms which make use of this:
> 
> drivers/i2c/busses/i2c-mv64xxx.c:924: undefined reference to `reset_control_assert'
> drivers/i2c/busses/i2c-mv64xxx.c:904: undefined reference to `reset_control_assert'
> drivers/i2c/busses/i2c-mv64xxx.c:771: undefined reference to `devm_reset_control_get'
> drivers/i2c/busses/i2c-mv64xxx.c:778: undefined reference to `reset_control_deassert'

The reset framework doesn't define its functions when its not
selected, and somehow I think it was not here. What's odd is that
there is an explicit select on RESET_CONTROLLER in the Kconfig. Maybe
it's the circular dependency issue that has been reported that cause
this and Wolfram sent a patch for: http://patchwork.ozlabs.org/patch/327573/

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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