[PATCH 0/2] ACPI : Introduce support for _CCA object

[Suravee Suthikulpanit]

This patch series introduce support for _CCA object, which is currently
used mainly by ARM64 platform to specify DMA coherency attribute for
devices when booting with ACPI.

A copy of ACPIv6 can be found here:
    http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf

This has been tested on AMD-Seattle platform, which implements _CCA 
object as described in the AMD Opteron A1100 Series Processor ACPI Porting Guide:

http://amd-dev.wpengine.netdna-cdn.com/wordpress/media/2012/10/Seattle_ACPI_Guide.pdf

Changes From RFC: (https://lkml.org/lkml/2015/4/1/389)
    * New logic for deriving and propagating coherent attribute from
      parent devices. (by Mark)
    * Introducing acpi_dma_is_coherent() API (Per Tom suggestion)
    * Introducing CONFIG_ACPI_MUST_HAVE_CCA kernel configuration.
    * Rebased to linux-4.1-rc1

Suravee Suthikulpanit (2):
  arm/arm64: ACPI: Introduce CONFIG_ACPI_MUST_HAVE_CCA
  ACPI / scan: Parse _CCA and setup device coherency

 arch/arm/Kconfig             |  1 +
 arch/arm64/Kconfig           |  1 +
 drivers/acpi/Kconfig         |  3 +++
 drivers/acpi/acpi_platform.c |  5 ++++-
 drivers/acpi/scan.c          | 45 ++++++++++++++++++++++++++++++++++++++++++++
 include/acpi/acpi_bus.h      |  9 ++++++++-
 6 files changed, 62 insertions(+), 2 deletions(-)

-- 
2.1.0