linux-kernel - Re: [Linaro-acpi] [RFC part1 PATCH 1/7] ACPI: Make ACPI core running without PCI on ARM64

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Message-Id: <201312091820.23006.arnd@arndb.de>
Date:	Mon, 9 Dec 2013 18:20:22 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Hanjun Guo <hanjun.guo@...aro.org>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	"patches@...aro.org" <patches@...aro.org>,
	Olof Johansson <olof@...om.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Will Deacon <Will.Deacon@....com>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Linaro-acpi] [RFC part1 PATCH 1/7] ACPI: Make ACPI core running without PCI on ARM64

On Monday 09 December 2013, Catalin Marinas wrote:
> CONFIG_PCI does not exist on arm64 yet (we have some internal patches
> but may not be ready to be posted before the holidays; they try to share
> code with other archs, so more discussions before merging). We could add
> CONFIG_PCI and some dummy functions on arm64 for development (not to be
> upstreamed) or Hanjun could continue to use the current patch before we
> get PCI working. In the order of priorities, we'll have to merge PCI
> before ACPI anyway.

Well, lack of PCI support on ARM64 is a much better reason for accepting
the patch than potential use on non-server platforms of course.

What is the status of the PCI work though? I suspect it won't be all
that hard to add minimal PCI support for a simple mmconfig plus
fixed I/O space based host of the kind that qemu can easily provide.

The hard part that we want to share code with other architectures is
supporting pluggable host controllers, and I think we can defer that
a bit.

	Arnd
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