PCI devices on Keystone doesn't have correct dma_pfn_offset set. This patch
add capability to set the dma configuration such as dma-mask, dma_pfn_offset,
and dma ops etc using the information from DT. The prior RFCs and discussions
are available at [1] and [2] below.

[2] : https://www.mail-archive.com/linux-kernel at vger.kernel.org/msg790244.html
[1] : http://www.gossamer-threads.com/lists/linux/kernel/2024591

Change history:
	v5 - moved the dma_mask update in device from ARM specific API to
	     of_dma_configure to allow this across other architecture as well
	   - improved sanity check for DT dma-range size in of_dma_configure()
	   - moved API to get parent bridge device to PCI (host-bridge.c)
	v4 - moved size adjustments in of_iommu_configure() to a separate patch
	   - consistent node name comment from Rob
	   - patch 6 added for dma_mask adjustment and iommu mapping size
	     limiting.
	v3 - addressed comments to re-use of_dma_configure() for PCI
	   - To help re-use, change of_iommu_configure() function argument
		- Move of_dma_configure to of/device.c
		- Limit the of_iommu_configure to non pci devices
	v2 - update size to coherent_dma_mask + 1 if dma-range info is missing
	   - also check the np for null.
	v1 - updates based on the comments against initial RFC.
	   - Added a helper function to get the OF node of the parent
	   - Added an API in of_pci.c to update DMA configuration of the pci
	     device.

Cc: Joerg Roedel <joro@8bytes.org>
Cc: Grant Likely <redacted>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Will Deacon <redacted>
Cc: Russell King <redacted>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Murali Karicheri <redacted>

Murali Karicheri (8):
  of: iommu: add ptr to OF node arg to of_iommu_configure()
  of: move of_dma_configure() to device.c to help re-use
  of: fix size when dma-range is not used
  PCI: add helper functions pci_get[put]_host_bridge_device()
  of/pci: add of_pci_dma_configure() update dma configuration
  PCI: update dma configuration from DT
  arm: dma-mapping: limit iommu mapping size
  of: limit dma_mask of the device based on dma-range size

 arch/arm/mm/dma-mapping.c |    7 +++++
 drivers/iommu/of_iommu.c  |   10 +++++--
 drivers/of/device.c       |   69 +++++++++++++++++++++++++++++++++++++++++++++
 drivers/of/of_pci.c       |   19 +++++++++++++
 drivers/of/platform.c     |   58 ++-----------------------------------
 drivers/pci/host-bridge.c |   14 +++++++++
 drivers/pci/probe.c       |    2 ++
 include/linux/of_device.h |    2 ++
 include/linux/of_iommu.h  |    6 ++--
 include/linux/of_pci.h    |    5 ++++
 include/linux/pci.h       |    3 ++
 11 files changed, 135 insertions(+), 60 deletions(-)

-- 
1.7.9.5