spi: bcm2835: enable support of 3-wire mode
authorMartin Sperl <kernel@martin.sperl.org>
Thu, 19 Mar 2015 09:01:53 +0000 (09:01 +0000)
committerMark Brown <broonie@kernel.org>
Mon, 23 Mar 2015 18:54:34 +0000 (11:54 -0700)
Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
drivers/spi/spi-bcm2835.c

index 8de1925fe5548f9ea58579e26268f6fafe391d4b..3f93718aad3f0d7be22fbe96fd9f53ccc85633e7 100644 (file)
@@ -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 @@ static int bcm2835_spi_start_transfer(struct spi_device *spi,
                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)