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spi: tegra114: add SPI_LSB_FIRST support 

Tegra SPI controller supports lsb first mode. Default is MSB bit first
and on selection of SPI_LSB_FIRST through SPI mode transmission happens
with LSB bit first.

This patch adds SPI_LSB_FIRST flag to mode_bits and also configures it
on request.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sowjanya Komatineni 2019-03-26 22:56:33 -07:00 committed by Mark Brown
parent fc9ba6e3e2
commit 2b17a3c759
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GPG Key ID: 24D68B725D5487D0
1 changed files with 6 additions and 1 deletions
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7
drivers/spi/spi-tegra114.c
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@ -696,6 +696,11 @@ static u32 tegra_spi_setup_transfer_one(struct spi_device *spi,
else if (req_mode == SPI_MODE_3)
command1 |= SPI_CONTROL_MODE_3;
if (spi->mode & SPI_LSB_FIRST)
command1 |= SPI_LSBIT_FE;
else
command1 &= ~SPI_LSBIT_FE;
if (tspi->cs_control) {
if (tspi->cs_control != spi)
tegra_spi_writel(tspi, command1, SPI_COMMAND1);
@ -1047,7 +1052,7 @@ 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;
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
master->setup = tegra_spi_setup;
master->transfer_one_message = tegra_spi_transfer_one_message;
master->num_chipselect = MAX_CHIP_SELECT;