tree 282b2100df88487e155416e3f3e5e351108c0dd4
parent d3d8aaec7401703079f296a6460fe649fb06581b
author Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> 1521715846 +0300
committer Jagan Teki <jagan@amarulasolutions.com> 1521739895 +0530

DW SPI: add option to use external gpio for chip select

DW SPI internal chip select management has limitation:
it hold CS line in active state only when the FIFO is not
empty. If the FIFO freed before we add new data the SPI transaction will
be broken.

So add option to use external gpio for chip select. Gpio can be added
via device tree using standard gpio bindings.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>