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Date: Tue, 26 Mar 2019 22:56:33 -0700 From: Sowjanya Komatineni <skomatineni@...dia.com> To: <thierry.reding@...il.com>, <jonathanh@...dia.com>, <talho@...dia.com>, <skomatineni@...dia.com>, <broonie@...nel.org>, <robh+dt@...nel.org>, <mark.rutland@....com>, <kyarlagadda@...dia.com> CC: <ldewangan@...dia.com>, <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <linux-spi@...r.kernel.org>, <devicetree@...r.kernel.org> Subject: [PATCH V1 12/26] 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@...dia.com> --- drivers/spi/spi-tegra114.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c index 0e228f1e910e..d39f7b05b824 100644 --- a/drivers/spi/spi-tegra114.c +++ b/drivers/spi/spi-tegra114.c @@ -750,6 +750,11 @@ 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); @@ -1137,7 +1142,7 @@ 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; -- 2.7.4
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