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spi: tegra114: add dual mode support 

This patch adds support for dual mode SPI transfer.

Dual mode uses both MOSI and MISO lines in parallel where the data
is interleaved on MOSI and MISO lines increasing the throughput.

Packet from Tx FIFO is transmitted on both MOSI and MISO lines and
packet to Rx FIFO is received from both MOSI and MISO lines. Even
bits are transmitted or received on the MOSI data line and odd bits
are transmitted or received on the MISO data line.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.2
Sowjanya Komatineni 2019-04-04 17:14:07 -07:00 committed by Mark Brown
parent 79567c1a32
commit 9877a347f2
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 7 additions and 1 deletions
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8
drivers/spi/spi-tegra114.c
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@ -786,6 +786,11 @@ static int tegra_spi_start_transfer_one(struct spi_device *spi,
total_fifo_words = tegra_spi_calculate_curr_xfer_param(spi, tspi, t);
if (t->rx_nbits == SPI_NBITS_DUAL || t->tx_nbits == SPI_NBITS_DUAL)
command1 |= SPI_BOTH_EN_BIT;
else
command1 &= ~SPI_BOTH_EN_BIT;
if (tspi->is_packed)
command1 |= SPI_PACKED;
else
@ -1152,7 +1157,8 @@ static int tegra_spi_probe(struct platform_device *pdev)
master->max_speed_hz = 25000000; /* 25MHz */
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST |
SPI_TX_DUAL | SPI_RX_DUAL;
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;