Around Sun 24 Jan 2016 19:21:50 +0000 or thereabout, Mans Rullgard wrote:

From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

The source and destination masters are reflecting buses or their layers to
where the different devices can be connected. The patch changes the master
names to reflect which one is related to which independently on the transfer
direction.

The outcome of the change is that the memory data width is now always limited
by a data width of the master which is dedicated to communicate to memory.

The patch will not break anything since all current users have the same data
width for all masters. Though it would be nice to revisit avr32 plaforms to
check what is the actual hardware topology is used there. It seems that it has
one bus and two masters on it as stated by Table 8-2, that's why everything
works independently on the master in use. The purpose of the sequential patch
is to fix the driver for configuration of more that one bus.

Not entirely sure what you want to have confirmed here. There are multiple
masters and slaves on the HMATRIX internal bus on AVR32, and the DMA
controller supports up to three simultaneous configurations.

Sounds good to support configuration of more than one bus. I thought we
always did support that? Perhaps it was a non-standard avr32 implementation.

The change is done in the assumption that src_master and dst_master are
reflecting a connection to the memory and peripheral correspondently on all
platforms except 460ex.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mans Rullgard <redacted>

For the avr32 related stuff:

Acked-by: Hans-Christian Egtvedt <redacted>

---
 Documentation/devicetree/bindings/dma/snps-dma.txt |  4 ++--
 arch/avr32/mach-at32ap/at32ap700x.c                | 16 ++++++++--------
 drivers/ata/sata_dwc_460ex.c                       |  4 ++--
 drivers/dma/dw/core.c                              | 15 +++++++--------
 drivers/dma/dw/platform.c                          | 12 ++++++------
 drivers/dma/dw/regs.h                              |  4 ++--
 drivers/spi/spi-pxa2xx-pci.c                       |  8 ++++----
 drivers/tty/serial/8250/8250_pci.c                 |  8 ++++----
 include/linux/platform_data/dma-dw.h               |  8 ++++----
 9 files changed, 39 insertions(+), 40 deletions(-)

<snipp diff>

-- 
Best regards, Hans-Christian Egtvedt