linux-kernel - Re: [PATCH v2 13/31] arm64: Device specific operations

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Message-Id: <201209141731.59938.arnd@arndb.de>
Date:	Fri, 14 Sep 2012 17:31:59 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Olof Johansson <olof@...om.net>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Will Deacon <Will.Deacon@....com>
Subject: Re: [PATCH v2 13/31] arm64: Device specific operations

On Friday 14 September 2012, Catalin Marinas wrote:
> (revisiting unanswered emails :))
> 
> On Wed, Aug 15, 2012 at 01:33:55AM +0100, Olof Johansson wrote:
> > On Tue, Aug 14, 2012 at 06:52:14PM +0100, Catalin Marinas wrote:
> > > +/*
> > > + *  I/O port access primitives.
> > > + */
> > > +#define IO_SPACE_LIMIT             0xffff
> > > +
> > > +/*
> > > + * We currently don't have any platform with PCI support, so just leave this
> > > + * defined to 0 until needed.
> > > + */
> > > +#define PCI_IOBASE         ((void __iomem *)0)
> > 
> > You could just leave out the PCI / I/O code alltogether instead.
> 
> I would leave this in as some of the first platforms to appear will have
> PCIe. At some point we'll add a fixed address where the PCI_IOBASE is
> mapped.
> 

I guess the cleanest way would be to reserve a virtual memory region right away
and document it in the file where you describe the memory layout. Then you can
fill the value in here.

	Arnd
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