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Unverified Commit 63c14405 authored by Sowjanya Komatineni's avatar Sowjanya Komatineni Committed by Mark Brown
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spi: tegra114: add support for gpio based CS 



This patch adds support for GPIO based CS control through SPI core
function spi_set_cs.

Signed-off-by: default avatarSowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 3393f7d9

drivers/spi/spi-tegra114.c

+13 −0
Original line number Diff line number Diff line
@@ -776,6 +776,10 @@ static u32 tegra_spi_setup_transfer_one(struct spi_device *spi, 
		} else

			tegra_spi_writel(tspi, command1, SPI_COMMAND1);



		/* GPIO based chip select control */

		if (spi->cs_gpiod)

			gpiod_set_value(spi->cs_gpiod, 1);



		command1 |= SPI_CS_SW_HW;

		if (spi->mode & SPI_CS_HIGH)

			command1 |= SPI_CS_SW_VAL;
@@ -864,6 +868,10 @@ static int tegra_spi_setup(struct spi_device *spi) 
	}



	spin_lock_irqsave(&tspi->lock, flags);

	/* GPIO based chip select control */

	if (spi->cs_gpiod)

		gpiod_set_value(spi->cs_gpiod, 0);



	val = tspi->def_command1_reg;

	if (spi->mode & SPI_CS_HIGH)

		val &= ~SPI_CS_POL_INACTIVE(spi->chip_select);
@@ -893,6 +901,10 @@ static void tegra_spi_transfer_end(struct spi_device *spi) 
	struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);

	int cs_val = (spi->mode & SPI_CS_HIGH) ? 0 : 1;



	/* GPIO based chip select control */

	if (spi->cs_gpiod)

		gpiod_set_value(spi->cs_gpiod, 0);



	if (cs_val)

		tspi->command1_reg |= SPI_CS_SW_VAL;

	else
@@ -1199,6 +1211,7 @@ static int tegra_spi_probe(struct platform_device *pdev) 
		master->max_speed_hz = 25000000; /* 25MHz */



	/* the spi->mode bits understood by this driver: */

	master->use_gpio_descriptors = true;

	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST |

			    SPI_TX_DUAL | SPI_RX_DUAL | SPI_3WIRE;

	master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);