openwrtv3/target/linux/cns3xxx/patches-3.18/075-spi_support.patch

--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -171,6 +171,13 @@ 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
@@ -25,6 +25,7 @@ obj-$(CONFIG_SPI_BITBANG)		+= spi-bitban
 obj-$(CONFIG_SPI_BUTTERFLY)		+= spi-butterfly.o
 obj-$(CONFIG_SPI_CADENCE)		+= spi-cadence.o
 obj-$(CONFIG_SPI_CLPS711X)		+= spi-clps711x.o
+obj-$(CONFIG_SPI_CNS3XXX)		+= spi-cns3xxx.o
 obj-$(CONFIG_SPI_COLDFIRE_QSPI)		+= spi-coldfire-qspi.o
 obj-$(CONFIG_SPI_DAVINCI)		+= spi-davinci.o
 obj-$(CONFIG_SPI_DESIGNWARE)		+= spi-dw.o
--- a/drivers/spi/spi-bitbang.c
+++ b/drivers/spi/spi-bitbang.c
@@ -335,6 +335,10 @@ static int spi_bitbang_transfer_one(stru
 			 */
 			if (!m->is_dma_mapped)
 				t->rx_dma = t->tx_dma = 0;
+
+			t->last_in_message_list =
+				list_is_last(&t->transfer_list, &m->transfers);
+
 			status = bitbang->txrx_bufs(spi, t);
 		}
 		if (status > 0)
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -630,6 +630,13 @@ 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
 };
 
 /**