linux-kernel - Re: [PATCH v7 1/6] pci: Introduce pci_register_io

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Date:	Mon, 07 Apr 2014 13:16:56 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Liviu Dudau <Liviu.Dudau@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	linux-pci <linux-pci@...r.kernel.org>,
	Will Deacon <Will.Deacon@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Tanmay Inamdar <tinamdar@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v7 1/6] pci: Introduce pci_register_io_range() helper function.

On Monday 07 April 2014 19:13:28 Benjamin Herrenschmidt wrote:
> On Mon, 2014-04-07 at 09:35 +0100, Liviu Dudau wrote:
> > Thanks for the summary, is really useful as I was recently looking
> > into code in that
> > area. One thing I was trying to understand is why ppc needs _IO_BASE
> > at all rather
> > than using the generic PCI_IOBASE? 
> 
> Perhaps because our code predates it ?  I haven't looked much into
> the semantics of PCI_IOBASE yet...

Yes, I'm pretty sure that's all there is to it. PCI_IOBASE just
happened to be an identifier we picked for asm-generic, but the
use on PowerPC is much older than the generic file.

	Arnd
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