--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -142,6 +142,13 @@ config SPI_CLPS711X
 	  This enables dedicated general purpose SPI/Microwire1-compatible
 	  master mode interface (SSI1) for CLPS711X-based CPUs.
 
+config SPI_CNS3XXX
+	tristate "CNS3XXX SPI controller"
+	depends on ARCH_CNS3XXX && SPI_MASTER
+	select SPI_BITBANG
+	help
+	  This enables using the CNS3XXX SPI controller in master mode.
+
 config SPI_COLDFIRE_QSPI
 	tristate "Freescale Coldfire QSPI controller"
 	depends on (M520x || M523x || M5249 || M525x || M527x || M528x || M532x)
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_SPI_BFIN5XX)		+= spi-bfin5x
 obj-$(CONFIG_SPI_BFIN_SPORT)		+= spi-bfin-sport.o
 obj-$(CONFIG_SPI_BITBANG)		+= spi-bitbang.o
 obj-$(CONFIG_SPI_BUTTERFLY)		+= spi-butterfly.o
+obj-$(CONFIG_SPI_CNS3XXX)		+= spi-cns3xxx.o
 obj-$(CONFIG_SPI_CLPS711X)		+= spi-clps711x.o
 obj-$(CONFIG_SPI_COLDFIRE_QSPI)		+= spi-coldfire-qspi.o
 obj-$(CONFIG_SPI_DAVINCI)		+= spi-davinci.o
--- a/drivers/spi/spi-bitbang.c
+++ b/drivers/spi/spi-bitbang.c
@@ -328,6 +328,12 @@ static void bitbang_work(struct work_str
 				 */
 				if (!m->is_dma_mapped)
 					t->rx_dma = t->tx_dma = 0;
+
+				if (t->transfer_list.next == &m->transfers)
+					t->last_in_message_list = 1;
+				else
+					t->last_in_message_list = 0;
+
 				status = bitbang->txrx_bufs(spi, t);
 			}
 			if (status > 0)
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -524,6 +524,13 @@ struct spi_transfer {
 	u32		speed_hz;
 
 	struct list_head transfer_list;
+
+#ifdef CONFIG_ARCH_CNS3XXX
+	unsigned	last_in_message_list;
+#ifdef CONFIG_SPI_CNS3XXX_2IOREAD
+	u8	dio_read;
+#endif
+#endif
 };
 
 /**