GPIO operations, you should be able to leverage that for better
speed with a custom version of this driver; see the source code.
+config SPI_IMX_VER_IMX1
+ def_bool y if SOC_IMX1
+
+config SPI_IMX_VER_0_0
+ def_bool y if SOC_IMX21 || SOC_IMX27
+
+config SPI_IMX_VER_0_4
+ def_bool y if ARCH_MX31
+
+config SPI_IMX_VER_0_7
+ def_bool y if ARCH_MX25 || ARCH_MX35
+
config SPI_IMX
tristate "Freescale i.MX SPI controllers"
depends on ARCH_MXC
select SPI_BITBANG
+ default m if IMX_HAVE_PLATFORM_SPI_IMX
help
This enables using the Freescale i.MX SPI controllers in master
mode.