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Subject[PATCH 0/7] of: setup dma parameters using dma-ranges and dma-coherent
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 <>
Cc: Russell King <>
Cc: Arnd Bergmann <>
Cc: Olof Johansson <>
Cc: Grant Likely <>
Cc: Rob Herring <>
Cc: Catalin Marinas <>
Cc: Linus Walleij <>
Cc: Grygorii Strashko <>

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(-)


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