linux-kernel - Re: [PATCH 1/3] ARM: at91: move at91 aic driver to drivers/irqchip

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Date:	Thu, 23 May 2013 14:44:03 +0200
From:	boris brezillon <b.brezillon@...rkiz.com>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
CC:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Andrew Victor <linux@...im.org.za>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/3] ARM: at91: move at91 aic driver to drivers/irqchip

On 23/05/2013 14:13, Thomas Petazzoni wrote:
> Dear Russell King - ARM Linux,
>
> On Thu, 23 May 2013 11:18:25 +0100, Russell King - ARM Linux wrote:
>
>> I notice arch/arm/mach-at91/pm.c makes use of some of the register
>> definitions:
>>
>>          at91_irq_suspend();
>>
>>          pr_debug("AT91: PM - wake mask %08x, pm state %d\n",
>>                          /* remember all the always-wake irqs */
>>                          (at91_pmc_read(AT91_PMC_PCSR)
>>                                          | (1 << AT91_ID_FIQ)
>>                                          | (1 << AT91_ID_SYS)
>>                                          | (at91_extern_irq))
>>                                  & at91_aic_read(AT91_AIC_IMR),
>>                          state);
>>
>> at91_irq_suspend() is in arch/arm/mach-at91/irq.c already, so there's no
>> reason that fragment can't be moved there.
> The problem is that the goal of the patch set is to move
> arch/arm/mach-at91/irq.c into drivers/irqchip/.
>
> However, if you move that chunk of code to drivers/irqchip/irq-at91.c,
> you are using at91_pmc_read() which is defined in
> arch/arm/mach-at91/include/mach/at91_pmc.h. So,
> drivers/irqchip/irq-at91.c would have to include such an header file,
> which is something we want to avoid since drivers/ code should not
> include something in <mach/...>, as it breaks multiplatform kernels.
>
> So, I'm afraid, simply moving this chunk of code in at91_irq_suspend()
> doesn't make the thing any better.
What about keeping the former at91_aic.h in arch/arm/match-at91 and copy 
the definitions we need in drivers/irqchip/irq-at91.c ?

This way we get an aic irqchip driver independant of any specific 
machine headers and keep the non dt boards and pm drivers without any 
change.
>
> Best regards,
>
> Thomas

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