linux-kernel - Re: [PATCHv2 2/2] ACPI/platform: Add ACPI ID for Intel MBI device

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Date:	Tue, 3 Dec 2013 18:44:52 -0800
From:	"David E. Box" <david.e.box@...ux.intel.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	rjw@...ysocki.net, linux-kernel@...r.kernel.org,
	platform-driver-x86@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCHv2 2/2] ACPI/platform: Add ACPI ID for Intel MBI device

On Wed, Dec 04, 2013 at 02:21:30AM +0000, Matthew Garrett wrote:
> On Tue, Dec 03, 2013 at 06:17:03PM -0800, David E. Box wrote:
> > This is per the requirement in Documentation/acpi/enumeration.txt:
> > 
> > "Currently the kernel is not able to automatically determine from which ACPI
> > device it should make the corresponding platform device so we need to add
> > the ACPI device explicitly to acpi_platform_device_ids list defined in
> > drivers/acpi/acpi_platform.c"
> 
> Well sure, but why do you need to be a platform device at all? This 
> functionality was intended for cases where we already have a driver for 
> the part that enumerated it via some other mechanism. If the driver's 
> only intended for ACPI systems then why not just be an ACPI device?
> 

It was my understanding that with ACPI 5.0 it was becoming more common to use
ACPI ID's exclusively for device enumeration. I originally wrote this as an
acpi_bus driver but Rafeal advised me that the model is being phased out and
suggeted the platform model instead.

> -- 
> Matthew Garrett | mjg59@...f.ucam.org
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