linux-kernel - Re: [PATCH 02/11] arm: pxa27x: support ICP DAS LP-8x4x

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Date:	Tue, 10 Dec 2013 13:33:03 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Sergei Ianovich <ynvich@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Eric Miao <eric.y.miao@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Olof Johansson <olof@...om.net>, Daniel Mack <zonque@...il.com>
Subject: Re: [PATCH 02/11] arm: pxa27x: support ICP DAS LP-8x4x

On Fri, Dec 6, 2013 at 6:14 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Friday 06 December 2013, Sergei Ianovich wrote:
>> On Fri, 2013-12-06 at 01:40 +0100, Arnd Bergmann wrote:
>>
>> > > +
>> > > +static struct irq_chip lp8x4x_irq_chip = {
>> > > +     .name                   = "FPGA",
>> > > +     .irq_ack                = lp8x4x_ack_irq,
>> > > +     .irq_mask               = lp8x4x_mask_irq,
>> > > +     .irq_unmask             = lp8x4x_unmask_irq,
>> > > +};
>> >
>> > Please try to move the irqchip code to drivers/irqchip/.
>>
>> CONFIG_IRQCHIP depends on CONFIG_OF_IRQ which in turn depends on Open
>> Firmware.
>
> Hmm, I wonder if we should try to change Kconfig then. Let's leave it
> alone for now, maybe Linus Walleij has some comments since he has
> been looking into moving drivers out in the past.

I don't get this, if the subarch has deps in place for IRQCHIP and
OF_IRQ just move the implementation to drivers/irqchip/foo.c
edit drivers/irqchip/Makefile to compile the file for ARCH_FOO.
What would the problem be? It's not like having the irqchip in the
object is optional...

I would prefer if you augment the code to use
IRQCHIP_DECLARE() so you can get rid of all the criss-cross
calls, but this init contains a comment saying that GPIO
has to be up before you initialize the irq_chip, can you please
explain why it's like that?

Another way is to create a separate Kconfig entry for it in
drivers/irqchip/Kconfig if you want the set-up to be more
distributed, but that is usually just done when the irqchip is
used on more than one platform.

Yours,
Linus Walleij
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