linux-kernel - Re: [PATCH v2] ARM: mmp: bring up pxa988 with device tree support

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Message-ID: <2766142.mFu63TyH69@wuerfel>
Date:	Fri, 14 Jun 2013 14:56:15 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Chao Xie <xiechao.mail@...il.com>
Cc:	Neil Zhang <zhangwm@...vell.com>, Chao Xie <cxie4@...vell.com>,
	"haojian.zhuang@...il.com" <haojian.zhuang@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ARM: mmp: bring up pxa988 with device tree support

On Friday 14 June 2013 17:15:33 Chao Xie wrote:
> On Mon, Jun 10, 2013 at 4:35 PM, Arnd Bergmann <arnd@...db.de> wrote:

> > I guess that is a problem we have on other platforms as well, we should
> > find a generic solution for that. It would be nice to reserve a page
> > in "fixmap" and have common code map the SCU page into that.
> >
> 
> So you mean that reserve a page in arch/arm/asm/include/fixmap.h?

Yes.

> This reserve will depend on the cpu type beacuse only A9 will have SCU part.

I think A5 and ARM11MPCore as well.

> I do not know that in fixmap, the #ifdef is acceptable or not.

Yes, it is. We don't really use fixmap on ARM for anything other than
kmap_atomic at the moment. Please have a look at the powerpc and x86
implementations.

> For the common code to map the SCU page, where do you suggest to put it?

arch/arm/kernel/smp_scu.c.

	Arnd
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