Re: [PATCH 13/13] ACPI: use unique number as bus_id of ACPI device in sysfs

[Zhang Rui <rui.zhang@intel.com>]

On Mon, 2006-11-27 at 01:10 -0500, Len Brown wrote:
> > Another way to fix this naming problem.
> > Many devices in ACPI namespace is meaningless. Only the devices with a
> > PNPID are physical devices and should be exported to userspace.
> > So we can only register these devices and use "PNPID:instance no" as its
> > name.
> > Add instance_no in struct acpi_device. Every time we fail to register an
> > ACPI device and get an error of "-EEXIST", loop acpi_device_list to get
> > the right instance_no and register again.
> 
> Yes, PNP-id's have definitions, and when we have the luxury of having
> devices with PNP-id's, we should use those, along with an instance number
> to handle the case of multiple devices of the PNPid.
> 
> Indeed, the question is if we should go so far as to translate the PNPid
> into English, or simply use the PNPid string.
> 
> eg "PNP0C0C" vs "button".
> 
> I vote for the PNPid, since it requires less maintenance:-)
> 
Yes.
For now, we can use "pnpid:instance_no" for devices with pnpid. For
devices without PNPid, we recognise them as "NO_PNPID:instance_no". Is
this OK?
> thanks,
> -Len