>To find if an acpi_device is a child of a PCI bus, it seems
>that you need to look at its parent, and parents of parents...
>to see if any are a PCI bus, eg have HID PNP0A03.

Alternatively, you could go top-down,
acpi_get_devices( PCI_ROOT_HID_STRING,
        and provide a callback to walk below the PCI bus found
        to see if you find your device.

-Len

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