[V5 PATCH 0/2] Introduce ACPI support for ahci_platform driver

Suravee Suthikulpanit
2015-03-06T06:27:13Z

This patch series introduce ACPI support for AHCI platform driver.
Existing ACPI support for AHCI assumes the device controller is a PCI device.
Since there is no ACPI _CID for generic AHCI controller, the driver
could not use it for matching devices. Therefore, this patch introduces
a mechanism for drivers to match devices using ACPI _CLS method.
_CLS contains PCI-defined class-code.

This patch series also modifies ACPI modalias to add class-code to the
exisiting format, which currently only uses _HID and _CIDs. This is required
to support loadable modules w/ _CLS.

This patch series is rebased from and tested with:

http://git.linaro.org/leg/acpi/acpi.git acpi-5.1-v9

This topic was discussed earlier here (as part of introducing support for
AMD Seattle SATA controller):

http://marc.info/?l=linux-arm-kernel&m=141083492521584&w=2

Changes from V4 (https://lkml.org/lkml/2015/3/2/56)
* [1/2] Bug fixed: Reorder the declaration of
struct acpi_pnp_device_id cls in the struct acpi_device_info
(include/acpi/actypes.h) since compatible_id_list must be last one.
* [2/2] Added Acked-by: Tejun Heo <tj@kernel.org>

Changes from V3 (https://lkml.org/lkml/2015/2/8/106)
* Instead of introducing new structure acpi_device_cls, add cls into
the acpi_device_id, and modify the __acpi_match_device
to also match for cls. (per Mika suggestion.)
* Add loadable module support, which requires changes in ACPI
modalias. (per Mika suggestion.)
* Rebased and tested with acpi-5.1-v9

Changes from V2 (https://lkml.org/lkml/2015/1/5/662)
* Update with review comment from Rafael in patch 1/2
* Rebased and tested with acpi-5.1-v8

Changes from V1 (https://lkml.org/lkml/2014/12/19/345)
* Rebased to 3.19.0-rc2
* Change from acpi_cls in device_driver to acpi_match_cls (Hanjun comment)
* Change the matching logic in acpi_driver_match_device() due to the new
special PRP0001 _HID.
* Simplify the return type of acpi_match_device_cls() to boolean.

Changes from RFC (https://lkml.org/lkml/2014/12/17/446)
* Remove #ifdef and make non-ACPI version of the acpi_match_device_cls
as inline. (per Arnd)
* Simplify logic to retrieve and evaluate _CLS handle. (per Hanjun)

Suravee Suthikulpanit (2):
ACPI / scan: Add support for ACPI _CLS device matching
ata: ahci_platform: Add ACPI _CLS matching

drivers/acpi/acpica/acutils.h | 3 ++
drivers/acpi/acpica/nsxfname.c | 21 ++++++++++--
drivers/acpi/acpica/utids.c | 71 +++++++++++++++++++++++++++++++++++++++
drivers/acpi/scan.c | 17 ++++++++--
drivers/ata/Kconfig | 2 +-
drivers/ata/ahci_platform.c | 9 +++++
include/acpi/acnames.h | 1 +
include/acpi/actypes.h | 4 ++-
include/linux/mod_devicetable.h | 1 +
scripts/mod/devicetable-offsets.c | 1 +
scripts/mod/file2alias.c | 13 +++++--
11 files changed, 134 insertions(+), 9 deletions(-)

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2.1.0