spi: tegra114: add SPI_LSB_FIRST support (2b17a3c7) · Commits · 戴 / test

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>

drivers/spi/spi-tegra114.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -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;

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