linux-kernel - Re: [PATCH 44/48] clocksource: atmel-pit: allow unselecting ATMEL

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Date:	Mon, 13 Jun 2016 21:14:47 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
cc:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH 44/48] clocksource: atmel-pit: allow unselecting
 ATMEL_PIT

On Mon, 13 Jun 2016, Boris Brezillon wrote:
> On Sat, 11 Jun 2016 12:53:51 +0200
> Alexandre Belloni <alexandre.belloni@...e-electrons.com> wrote:
> 
> > On 11/06/2016 at 11:43:54 +0200, Thomas Gleixner wrote :
> > > On Sat, 11 Jun 2016, Alexandre Belloni wrote:
> > >   
> > > > With the new TCB clocksource driver, atmel platforms are now able to boot
> > > > without the PIT driver. Allow unselecting it.  
> > > 
> > > Yay! Thanks for doing this!
> > >   
> > 
> > Sure! Can you still check the request_irq/free_irq in
> > timer-atmel-tcbclksrc? I'm not sure whether this can work reliably or
> > only because we are before SYSTEM_STATE=RUNNING.
> > In the latter case, I have another way of doing that.
> > 
> 
> Sorry to put it back on the table, but shouldn't we consider adding
> these irq_disable/enable_action() helpers?

I fear that's the only reliable way to do it.