Re: [PATCH 2/3] spi / ACPI: add ACPI enumeration support

[Mika Westerberg]

On Mon, Nov 05, 2012 at 10:43:17AM -0700, Bjorn Helgaas wrote:
> > It should already be unique in case of ACPI. We use ACPI _HID and _UID to
> > achieve that.
> 
> Using only _HID and _UID to guarantee uniqueness means you're relying
> on a property of the BIOS, so you're vulnerable to BIOS bugs.
> 
> If there's an ACPI Device for I2C adapters, why wouldn't you just use
> its device name as set in acpi_device_register() (basically a _HID +
> instance number)?

That's a good point - we could change to use that instead (the platform
code in linux-pm tree uses _HID + _UID but I guess it is pretty trivial to
change).
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