Merge branch 'topic/at_xdmac' of git://git.infradead.org/users/vkoul/slave-dma into next/dt

This is a dependency for the at91 DT support, and marked as a stable branch
by Vinod

* 'topic/at_xdmac' of git://git.infradead.org/users/vkoul/slave-dma

:
  dmaengine: at_xdmac: Add DMA_PRIVATE
  ARM: dts: at_xdmac: fix bad value of dma-cells in documentation
  dmaengine: at_xdmac: fix missing spin_unlock
  dmaengine: at_xdmac: fix a bug in transfer residue computation
  dmaengine: at_xdmac: fix software lockup at_xdmac_tx_status()
  dmaengine: at_xdmac: remove chancnt affectation
  dmaengine: at_xdmac: prefer usage of readl/writel_relaxed
  dmaengine: xdmac: fix print warning on dma_addr_t variable
  dmaengine: xdmac: fix print warning on size_t variable
  dmaengine: at_xdmac: fix usage of read, write wrappers
  dmaengine: at_xdmac: fix semicolon.cocci warnings
  MAINTAINERS: add entry for Atmel XDMA driver
  ARM: dts: at_xdmac: add bindings documentation
  dmaengine: at_xdmac: creation of the atmel eXtended DMA Controller driver

Signed-off-by: Arnd Bergmann <arnd@arndb.de>