spi: kconfig: add soft spi Kconfig entry

Add the Kconfig entry for SOFT_SPI which uses gpio to simulate the
SPI signals. We use it for accessing 74x164 on some i.MX boards.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Jagan Teki <jagan@openedev.com>
Cc: Stefano Babic <sbabic@denx.de>

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index f3f7dbe..bef864f 100644 (file)
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -197,6 +197,12 @@ config OMAP3_SPI
 
 endif # if DM_SPI
 
+config SOFT_SPI
+       bool "Soft SPI driver"
+       help
+        Enable Soft SPI driver. This driver is to use GPIO simulate
+        the SPI protocol.
+
 config FSL_ESPI
        bool "Freescale eSPI driver"
        help