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Subject[PATCH V3 6/9] spi: tegra114: add support for gpio based CS
Date
This patch adds support for GPIO based CS control through SPI core
function spi_set_cs.

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

diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c
index f4e39eb3857c..0b04eba242c0 100644
--- a/drivers/spi/spi-tegra114.c
+++ b/drivers/spi/spi-tegra114.c
@@ -781,6 +781,9 @@ static u32 tegra_spi_setup_transfer_one(struct spi_device *spi,
} else
tegra_spi_writel(tspi, command1, SPI_COMMAND1);

+ /* GPIO based chip select control */
+ spi_set_cs(spi, true);
+
command1 |= SPI_CS_SW_HW;
if (spi->mode & SPI_CS_HIGH)
command1 |= SPI_CS_SW_VAL;
@@ -869,6 +872,8 @@ static int tegra_spi_setup(struct spi_device *spi)
}

spin_lock_irqsave(&tspi->lock, flags);
+ /* GPIO based chip select control */
+ spi_set_cs(spi, false);
val = tspi->def_command1_reg;
if (spi->mode & SPI_CS_HIGH)
val &= ~SPI_CS_POL_INACTIVE(spi->chip_select);
@@ -898,6 +903,8 @@ 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 */
+ spi_set_cs(spi, false);
if (cs_val)
tspi->command1_reg |= SPI_CS_SW_VAL;
else
--
2.7.4
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