[PATCH 0/7] of: setup dma parameters using dma-ranges and dma-coherent

[Santosh Shilimkar]

Based on comments from [1] discussion, it seems there is a need to
have a generic support to configure dma device parameters.
Series introduces support for setting up dma parameters based on
device tree properties like 'dma-ranges' and 'dma-coherent'.

The 'dma-ranges' helps to take care of few DMAable system memory restrictions
by use of dma_pfn_offset which we maintain now per device. Arch code then
uses it for dma address translations for such cases. We also setup
dma_mask accordingly during the device creation process.

The 'dma-coherent' property is used to setup coherent dma_ops. Arches
which are always coherent can make use of ARCH_IS_DMA_COHERENT to setup
coherent dma_ops always irrespective of 'dma-coherent' property.

Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Olof Johansson <olof@xxxxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: Grygorii Strashko <grygorii.strashko@xxxxxx>

Grygorii Strashko (3):
  of: introduce of_dma_get_range() helper
  of: configure the platform device dma_mask and dma_pfn_offset
  ARM: dma: Use dma_pfn_offset for dma address translation

Santosh Shilimkar (4):
  device: introduce per device dma_pfn_offset
  of: introduce of_dma_is_coherent() helper
  of: Add set_arch_dma_coherent_ops() and setup coherent dma_ops
  ARM: dma: implement set_arch_dma_coherent_ops()

 arch/arm/include/asm/dma-mapping.h |   24 ++++-
 drivers/of/platform.c              |  196 +++++++++++++++++++++++++++++++++++-
 include/linux/device.h             |    2 +
 include/linux/dma-mapping.h        |    7 ++
 include/linux/of_platform.h        |   14 +++
 5 files changed, 236 insertions(+), 7 deletions(-)

Regards,
Santosh
[1] http://www.spinics.net/lists/arm-kernel/msg311678.html
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