Re: [PATCH v1 0/4] ACPI: scan: Handle generic system devices directly

[Mario Limonciello <superm1@kernel.org>]

On 12/15/25 7:31 AM, Rafael J. Wysocki wrote:
> Hi All,
> 
> As per the changelog of patch [1/4], there is a long-standing problem with ACPI
> device enumeration that if the given device has a compatible ID which is one of
> the generic system resource device IDs (PNP0C01 and PNP0C02), it will be claimed
> by the PNP scan handler and it will not be represented as a platform device, so
> it cannot be handled by a platform driver.
> 
> Obviously, PNP0C01 and PNP0C02 need to be removed from acpi_pnp_device_ids[] to
> address this problem, but it cannot be done without making any other changes
> due to the way the legacy PNP system driver works (see the changelog of patch
> [1/4] for details) and the approach used in patch [1/4] is to reserve the
> "motherboard resources" directly in the ACPI core without creating platform
> devices for "system" devices (whose _HID is either PNP0C01 or PNP0C02).  The
> new code doing works along the lines of the PNP system driver to avoid
> regressions.
> 
> The remaining patches in the series are simplifications that can be done on
> top of the first one.
> 
> Patches [2-3/4] remove platform device creation code from Intel HID and VBTN
> drivers that don't need to worry about _CID including PNP0C02 any more.
> 
> Patch [4/4] drops acpi_nonpnp_device_ids[] that was added as a workaround for
> the issue at hand in the first place.
> 
> Thanks!
> 
> 
> 
> 

For the series:

Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>