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

[Rob Herring]

On Thu, Dec 5, 2013 at 4:04 PM, Arnd Bergmann <arnd@xxxxxxxx> wrote:
> On Wednesday 04 December 2013, Hanjun Guo wrote:
>> On 2013å12æ04æ 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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