linux-kernel - Re: [PATCH 0/4] Convert ACPI fan driver to platform driver

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Message-ID: <1654759.afJtadVnDQ@vostro.rjw.lan>
Date:	Thu, 05 Dec 2013 00:07:31 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Aaron Lu <aaron.lu@...el.com>
Cc:	Zhang Rui <rui.zhang@...el.com>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Lan Tianyu <tianyu.lan@...el.com>,
	Len Brown <len.brown@...el.com>
Subject: Re: [PATCH 0/4] Convert ACPI fan driver to platform driver

On Tuesday, December 03, 2013 04:28:28 PM Aaron Lu wrote:
> This patchset converts ACPI fan driver to platform driver. Patch 1-3 are
> cleanups for existing fan driver and patch 4 does the convertion.
> 
> Tested on harris beach.
> Apply on top of Rafael's linux-next branch.
> 
> Aaron Lu (4):
>   ACPI / fan: remove unused macro for debug
>   ACPI / fan: remove no need check for device pointer
>   ACPI / fan: use acpi_device_xxx_power instead of acpi_bus equivelant
>   ACPI / fan: convert to platform driver
> 
>  drivers/acpi/acpi_platform.c |  3 ++
>  drivers/acpi/device_pm.c     |  1 +
>  drivers/acpi/fan.c           | 88 ++++++++++++++++----------------------------
>  drivers/acpi/internal.h      |  2 -
>  include/acpi/acpi_bus.h      |  1 +
>  5 files changed, 36 insertions(+), 59 deletions(-)

Unfortunately, we need to postpone these conversions, because Matthew Garrett
has problems with adding more entries to acpi_platform_device_ids[].  He seems
to be concerned that that list will grow indefinitely and will become difficult
to maintain eventually.

For this reason, he would prefer it if we did the following:
- Figure out the list of ACPI device IDs we need to create PNP devices for
  via ACPI PNP.
- Make ACPI PNP create PNP devices for these IDs only and make the ACPI core create
  platform devices for all "unassigned" ACPI device objects by default.
- Do the conversions at that point.

I'm slightly worried that we'll encounter ordering issues while doing that, but
this is the only way forward I can see without going straight against the
Matthew's objections, which I'd prefer to avoid.

Thanks,
Rafael

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