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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>
hifive-unleashed-5.1
Martin Sperl 2015-03-19 09:01:53 +00:00 committed by Mark Brown
parent 210b49231a
commit 6935224da2
1 changed files with 5 additions and 1 deletions
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6
drivers/spi/spi-bcm2835.c
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@ -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)