From 6935224da2482a261c786501fbccb1dc4a675225 Mon Sep 17 00:00:00 2001 From: Martin Sperl Date: Thu, 19 Mar 2015 09:01:53 +0000 Subject: spi: bcm2835: enable support of 3-wire mode Signed-off-by: Martin Sperl Signed-off-by: Mark Brown --- drivers/spi/spi-bcm2835.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c index 8de1925fe554..3f93718aad3f 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 @@ 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) -- cgit v1.2.3