tree ab2efceebe210623e9f54e967cec554dfa32bfb3
parent 2ce04684335f886fb5adb9ecbd2a85affca549d1
author Thor Thayer <tthayer@opensource.altera.com> 1476109524 -0500
committer Mark Brown <broonie@kernel.org> 1476181744 +0200

spi: Add Flag to Enable Slave Select with GPIO Chip Select.

Some SPI masters require slave selection before the transfer
can begin [1]. The SPI framework currently selects the chip using
either 1) the internal CS mechanism or 2) the GPIO CS, but not both.

This patch adds a new master->flags define to indicate both the GPIO
CS and the internal chip select mechanism should be used.

Tested On:
    Altera CycloneV development kit
    Compile tested for build errors on x86_64 (allyesconfigs)

[1] DesignWare dw_apb_ssi Databook, Version 3.20a (page 39)

Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
Signed-off-by: Mark Brown <broonie@kernel.org>