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

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Message-ID: <CAL_JsqKKKh7d61hJuSc8mGMCmeYB1hshHGS5ML4eRXWHmjZrgA@mail.gmail.com>
Date:	Mon, 9 Dec 2013 17:34:49 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mark Rutland <mark.rutland@....com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Al Stone <al.stone@...aro.org>,
	Linaro Patches <patches@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	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, linux-acpi@...r.kernel.org,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Olof Johansson <olof@...om.net>,
	Jon Masters <jonathan@...masters.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...aro.org>
Subject: Re: [RFC part1 PATCH 1/7] ACPI: Make ACPI core running without PCI on ARM64

On Thu, Dec 5, 2013 at 4:04 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Wednesday 04 December 2013, Hanjun Guo wrote:
>> On 2013年12月04日 00:41, Matthew Garrett wrote:
>> > Given the number of #ifdefs you're adding, wouldn't it make more sense
>> > to just add stub functions to include/linux/pci.h?
>>
>> Thanks for the suggestion :)
>>
>> I can add stub functions in include/linux/pci.h for raw_pci_read()/
>> raw_pci_write(), then can remove #ifdefs for acpi_os_read/write_pci_configuration().
>
> Actually I wonder about the usefulness of this patch in either form: Since ACPI
> on ARM64 is only for servers, I would very much expect them to always come with
> PCI, either physical host bridges with attached devices, or logical PCI functions
> used to describe the on-SoC I/O devices. Even in case of virtual machines, you'd
> normally use PCI as the method to communicate data about the virtio channels.
>
> Can you name a realistic use-case where you'd want ACPI but not PCI?

Calxeda h/w. Yes, we do have PCI, but it is optional.

Rob
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