linux-kernel - Re: [PATCH 4/4] ACPI / platform: Use struct acpi_scan

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Date:	Tue, 29 Jan 2013 09:35:32 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Yinghai Lu <yinghai@...nel.org>, Jiang Liu <liuj97@...il.com>,
	Toshi Kani <toshi.kani@...com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] ACPI / platform: Use struct acpi_scan_handler for
 creating devices

On Mon, Jan 28, 2013 at 02:01:14PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Currently, the ACPI namespace scanning code creates platform device
> objects for ACPI device nodes whose IDs match the contents of the
> acpi_platform_device_ids[] table.  However, this adds a superfluous
> special case into acpi_bus_device_attach() and makes it more
> difficult to follow than it has to be.  It also will make it more
> difficult to implement removal code for those platform device objects
> in the future.
> 
> For the above reasons, introduce a struct acpi_scan_handler object
> for creating platform devices and move the code related to that from
> acpi_bus_device_attach() to the .attach() callback of that object.
> Also move the acpi_platform_device_ids[] table to acpi_platform.c.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

I've tested this with Haswell machine and once you fix the problem pointed
out by Yasuaki Ishimat (returning always when ACPI_PLATFORM_CLK is set) the
platform device creation works well. This is a nice cleanup and localizes
the hard coded platform device table in one file making maintenance bit
easier.

Feel free to add:

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Tested-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
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