linux-kernel - Re: [Update][PATCH] ACPI / scan: Add a scan handler for PRP0001

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Date:	Fri, 24 Apr 2015 15:21:00 -0700
From:	Darren Hart <dvhart@...radead.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Update][PATCH] ACPI / scan: Add a scan handler for PRP0001

On Fri, Apr 24, 2015 at 02:15:22AM +0200, Rafael Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> If the special PRP0001 device ID is present in the given device's list
> of ACPI/PNP IDs and the device has a valid "compatible" property in
> the _DSD, it should be enumerated using the default mechanism,
> unless some scan handlers match the IDs preceding PRP0001 in the
> device's list of ACPI/PNP IDs.  In addition to that, no scan handlers
> matching the IDs following PRP0001 in that list should be attached
> to the device.
> 
> To make that happen, define a scan handler that will match PRP0001
> and trigger the default enumeration for the matching devices if the
> "compatible" property is present for them.
> 
> Since that requires the check for platform_id and device->handler
> to be removed from acpi_default_enumeration(), move the fallback
> invocation of acpi_default_enumeration() to acpi_bus_attach()
> (after it's checked if there's a matching ACPI driver for the
> device), which is a better place to call it, and do the platform_id
> check in there too (device->handler is guaranteed to be unset at
> the point where the function is looking for a matching ACPI driver).
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Acked-by: Darren Hart <dvhart@...ux.intel.com>
> ---
> 
> The change from the original patch is to change the scan handler
> behavior to make it return 1 also if the "compatible" property is
> not present, in which case the additional scan handlers should not
> trigger too *and* the default enumeration should not trigger either
> (as there's no ID to match to), which will allow things like
> auxiliary nodes (think GPIO buttons/LEDs etc) to be easily represented.


This should probably be spelled out in the commit message itself as it's a fairly
unique condition.


> Darren, I've tentatively added your Acked-by tag to this one, please
> let me know if that's not appropriate.

Spent a bit more time on it this time, so:

Reviewed-by: Darren Hart <dvhart@...ux.intel.com>

Thanks,

-- 
Darren Hart
Intel Open Source Technology Center
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