commit 6935224da2482a261c786501fbccb1dc4a675225
author Martin Sperl <kernel@martin.sperl.org> Thu Mar 19 09:01:53 2015 +0000
committer Mark Brown <broonie@kernel.org> Mon Mar 23 11:54:34 2015 -0700
tree 56fd215b05bc43b505ce124ebdf3c22bbc20c46d
parent 210b49231af6a3ede5de3c90850dbf1134a855c2

spi: bcm2835: enable support of 3-wire mode

Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-bcm2835.c

diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c
index 8de1925..3f93718 100644
--- a/drivers/spi/spi-bcm2835.c
+++ b/drivers/spi/spi-bcm2835.c
@@ -67,7 +67,8 @@
 #define BCM2835_SPI_CS_CS_01		0x00000001
 
 #define BCM2835_SPI_TIMEOUT_MS	30000
-#define BCM2835_SPI_MODE_BITS	(SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_NO_CS)
+#define BCM2835_SPI_MODE_BITS	(SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \
+				| SPI_NO_CS | SPI_3WIRE)
 
 #define DRV_NAME	"spi-bcm2835"
 
@@ -163,6 +164,9 @@
 		cdiv = 0; /* 0 is the slowest we can go */
 	}
 
+	if ((spi->mode & SPI_3WIRE) && (tfr->rx_buf))
+		cs |= BCM2835_SPI_CS_REN;
+
 	if (spi->mode & SPI_CPOL)
 		cs |= BCM2835_SPI_CS_CPOL;
 	if (spi->mode & SPI_CPHA)