Re: [V8 PATCH 1/3] ACPICA: Add ACPI _CLS processing

From: Rafael J. Wysocki
Date: Fri Apr 24 2015 - 22:04:26 EST

On Friday, April 24, 2015 04:08:31 PM Suravee Suthikulpanit wrote:
> On 4/16/15 20:45, Zheng, Lv wrote:
> > Before back porting this to ACPICA, let me ask one simple question.
> > According to the spec, the _CLS is optional and PCI specific.
> > So why should we implement it in ACPICA core not OSPM specific modules?
> > If this need to be implemented in ACPICA, then what about the following device identification objects?
> > _DDN, _HRV, _MLS, _PLD, _STR, _SUN
> >
> > Thanks and best regards
> > -Lv
> Hi,
> Sorry for late reply. As for the justification for introducing the _CLS
> support in the ACPICA, this is mainly because ACPI does not currently
> define _CID for certain device classes, which used to mostly be PCI
> devices. Instead, ACPI spec mentioned that _CLS can be used for loading
> generic drivers on hardware that is compatible with PCI-defined device
> classes, but that is not implemented on the PCI bus (and is therefore
> enumerated by ACPI.)

I think it would be good to point to the particular part of the spec
making that provision. In what section is that mentioned, exactly?

I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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