SPI: omap2_mcspi driver

Add OMAP24XX McSPI (Multichannel SPI) controller driver.  This driver is
tested very well under OMAP GIT tree with N800 - Nokia Internet Tablet, and
some other OMAP2 boards.

Recent updates included bugfixes, cleanups, speedups, and better
conformance to the current SPI programming interface.  This doesn't yet
understand the third controller instance on the OMAP 2430.

[david-b@pacbell.net: more minor cleanups to the omap2_mcspi driver]
Signed-off-by: Juha Yrjölä <juha.yrjola@solidboot.com>
Signed-off-by: Trilok Soni <soni.trilok@gmail.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/spi/Kconfig

@@ -142,6 +142,12 @@ config SPI_OMAP_UWIRE
 	help
 	  This hooks up to the MicroWire controller on OMAP1 chips.
 
+config SPI_OMAP24XX
+	tristate "McSPI driver for OMAP24xx"
+	depends on SPI_MASTER && ARCH_OMAP24XX
+	help
+	  SPI master controller for OMAP24xx Multichannel SPI
+	  (McSPI) modules.
 
 config SPI_PXA2XX
 	tristate "PXA2xx SSP SPI master"

drivers/spi/Makefile

@@ -20,6 +20,7 @@ obj-$(CONFIG_SPI_IMX)			+= spi_imx.o
 obj-$(CONFIG_SPI_LM70_LLP)		+= spi_lm70llp.o
 obj-$(CONFIG_SPI_PXA2XX)		+= pxa2xx_spi.o
 obj-$(CONFIG_SPI_OMAP_UWIRE)		+= omap_uwire.o
+obj-$(CONFIG_SPI_OMAP24XX)		+= omap2_mcspi.o
 obj-$(CONFIG_SPI_MPC52xx_PSC)		+= mpc52xx_psc_spi.o
 obj-$(CONFIG_SPI_MPC83xx)		+= spi_mpc83xx.o
 obj-$(CONFIG_SPI_S3C24XX_GPIO)		+= spi_s3c24xx_gpio.o