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>> devices, to route PCI-PCI bus interrupt, to use ATA bus timing setting
>> informations, to handle ACPI PCI hotplug device, and etc.
>>
>Yes, however we attach things (and under ACPI it is still more or less
>expected that you attach things) to the bus that enumerates them.
>
>PCI bridges enumerate PCI devices, so PCI devices go under PCI bridges.
>
>Stuff that's enumerated by ACPI ends up under ACPI.

It is true that ACPI namespace sometimes form odd structure, but
ACPI devices often cannot be identified without 
existing bus enumeration mechanism, especially 
other than ISA-like devices.

So it is meaningful that device tree have nearly same 
layout as ACPI namespace as far as possible.

I don't object some ISA-like devices are direct child of acpi bus.
It is  more better that ISA bus children is automatically 
child of ACPI-bus children.
