tree 79c32942e7fec113c9e691544d35afa5a29d282a
parent 9217a5bf66061c392e461255c5d9d41aac136e58
author Andy Shevchenko <andriy.shevchenko@linux.intel.com> 1471450821 +0300
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1472652809 +0200

dmaengine: dw: set polarity of handshake interface

Intel Quark UART uses DesignWare DMA IP. Though the DMA IP is connected in such
way that handshake interface uses inverted polarity. We have to provide a
possibility to set this in the DMA driver when configuring a channel.

Introduce a new member of custom slave configuration called 'hs_polarity' and
set active low polarity in case this value is 'true'.

Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>