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_MX25 || SOC_IMX31 || SOC_IMX35 || SOC_IMX51 || SOC_IMX53
-
-config SPI_IMX_VER_2_3
- def_bool y if SOC_IMX51 || SOC_IMX53
-
config SPI_IMX
tristate "Freescale i.MX SPI controllers"
depends on ARCH_MXC