[PATCH V3 4/9] spi: tegra114: add support for Tegra SPI LSBYTE_FIRST

[Sowjanya Komatineni]

Tegra SPI master controller supports configuring least significant
first byte order or most significant first byte order for transfers.

This patch adds SPI_LSBYTE_FIRST to supported mode list and also
configures byte order based on the mode request for transfer.

Signed-off-by: Sowjanya Komatineni <skomatineni@xxxxxxxxxx>
---
 drivers/spi/spi-tegra114.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c
index b1f31bb16659..f4e39eb3857c 100644
--- a/drivers/spi/spi-tegra114.c
+++ b/drivers/spi/spi-tegra114.c
@@ -764,6 +764,11 @@ static u32 tegra_spi_setup_transfer_one(struct spi_device *spi,
 		else
 			command1 &= ~SPI_LSBIT_FE;
 
+		if (spi->mode & SPI_LSBYTE_FIRST)
+			command1 |= SPI_LSBYTE_FE;
+		else
+			command1 &= ~SPI_LSBYTE_FE;
+
 		if (spi->mode & SPI_3WIRE)
 			command1 |= SPI_BIDIROE;
 		else
@@ -1200,7 +1205,8 @@ 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_3WIRE;
+			    SPI_TX_DUAL | SPI_RX_DUAL | SPI_3WIRE |
+			    SPI_LSBYTE_FIRST;
 	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;
-- 
2.7.4