linux-kernel - Re: [PATCH 18/23] power/reset: at91-reset: get and use slow clock

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Message-ID: <20150810171148.GA21858@earth>
Date:	Mon, 10 Aug 2015 19:11:49 +0200
From:	Sebastian Reichel <sre@...nel.org>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH 18/23] power/reset: at91-reset: get and use slow clock

Hi,

On Mon, Aug 10, 2015 at 05:50:05PM +0200, Alexandre Belloni wrote:
> On 05/08/2015 at 20:22:20 +0200, Sebastian Reichel wrote :
> > On Fri, Jul 31, 2015 at 11:39:54AM +0200, Alexandre Belloni wrote:
> > > Commit dca1a4b5ff6e ("clk: at91: keep slow clk enabled to prevent system
> > > hang") added a workaround for the slow clock as it is not properly handled
> > > by its users.
> > > 
> > > Get and use the slow clock as it is necessary for the at91 reset
> > > controller.
> > 
> > You call clk_prepare_enable during probe without a matching
> > clk_disable_unprepare on module removal.
> 
> They will never be compiled as modules as the Kconfig option is a
> bool so we don't have a .remove and the module will never be removed.

In that case the module_platform_driver() statement at the bottom
should be replaced with builtin_platform_driver().

> Do you want me to change at91-reset and at91-poweroff to work as
> modules?

That would also be fine.

-- Sebastian

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