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

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Message-ID: <20130523120920.1df8e23a@skate>
Date:	Thu, 23 May 2013 12:09:20 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	boris brezillon <b.brezillon@...rkiz.com>
Cc:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Andrew Victor <linux@...im.org.za>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] ARM: at91: move at91 aic driver to drivers/irqchip

Dear boris brezillon,

On Thu, 23 May 2013 11:51:36 +0200, boris brezillon wrote:
> On 23/05/2013 11:06, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > On 11:05 Thu 23 May     , Boris BREZILLON wrote:
> >> Move arch/arm/mach-at91/irq.c to drivers/irqchip/irq-at91.c.
> >> Move arch/arm/mach-at91/at91_aic.h to
> >> arch/arm/mach-at91/include/mach/at91_aic.h to avoid ugly reference
> >> to header file :
> >> #include "../../arch/arm/mach-at91/at91_aic.h"
> > no we are going to drop arch/arm/mach-at91/include/mach for multi support
> >
> > arch/arm/mach-at91/include/mach is for removal
> What should be done ?
> 
> include ../../arch/arm/mach-at91/at91_aic.h from irq-at91.c
> 
> or
> 
> move at91_aic.h into drivers/irqchips and patch every non dt board to
> include ../../../drivers/irqchip/at91_aic.h

You can put it in <linux/irqchip/at91-aic.h>, there are already a few
headers there. But I think it's not the right solution.

*However*, ideally, this header should disappear completely. All the
register defines should go directly into the driver C file. The only
usage of the AIC defines outside of the IRQ driver are for debug prints
in the pm.c code, which I think you could get rid of.

Ditto for the at91_aic_{read,write} macros.

The NR_AIC5_IRQS can also move to the driver itself.

The only remaining one would be NR_AIC_IRQS, you can't get rid of it,
because it's used for the IRQ priority arrays. But I believe keeping
this one in <linux/irqchip/at91-aic.h> is reasonable.

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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