diff options
| author | Sowjanya Komatineni <skomatineni@nvidia.com> | 2019-04-04 17:14:08 -0700 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-04-08 14:12:26 +0700 |
| commit | 9d199231b000414e420a35912760f2d67e9c56d7 (patch) | |
| tree | 8cba37fd6bfb4e6f5e5bdf152647282c085753c4 /drivers/spi | |
| parent | 9877a347f2056f7aa4e770de9a20048ad288f545 (diff) | |
| download | linux-rt-9d199231b000414e420a35912760f2d67e9c56d7.tar.gz | |
spi: tegra114: add 3 wire transfer mode support
This patch adds 3 wire transfer support to SPI mode list along with
its implementation.
3 wire or Bi-directional mode uses only one serial data pin for the
transfer. SPI in master mode uses MOSI data line only and MISO data
line is not used.
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-tegra114.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c index 1e749ce13029..751672b3bc16 100644 --- a/drivers/spi/spi-tegra114.c +++ b/drivers/spi/spi-tegra114.c @@ -754,6 +754,11 @@ static u32 tegra_spi_setup_transfer_one(struct spi_device *spi, else command1 &= ~SPI_LSBIT_FE; + if (spi->mode & SPI_3WIRE) + command1 |= SPI_BIDIROE; + else + command1 &= ~SPI_BIDIROE; + if (tspi->cs_control) { if (tspi->cs_control != spi) tegra_spi_writel(tspi, command1, SPI_COMMAND1); @@ -1158,7 +1163,7 @@ static int tegra_spi_probe(struct platform_device *pdev) /* the spi->mode bits understood by this driver: */ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST | - SPI_TX_DUAL | SPI_RX_DUAL; + SPI_TX_DUAL | SPI_RX_DUAL | SPI_3WIRE; master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); master->setup = tegra_spi_setup; master->transfer_one_message = tegra_spi_transfer_one_message; |