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spi: spi-imx: add support for SPI_MOSI_IDLE_LOW mode bit

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By default, the spi-imx controller pulls the mosi line high, whenever it
is idle. This behaviour can be inverted per CS by setting the
corresponding DATA_CTL bit in the config register of the controller.

Also, since the controller mode-bits have to be touched anyways, the
SPI_CPOL and SPI_CPHA are replaced by the combined SPI_MODE_X_MASK flag.

Signed-off-by: Boerge Struempfel <boerge.struempfel@gmail.com>
Link: https://lore.kernel.org/r/20230530141641.1155691-3-boerge.struempfel@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Boerge Struempfel 2023-05-30 16:16:38 +02:00 committed by Mark Brown
parent a45baa079e
commit 6a983ff510
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GPG Key ID: 24D68B725D5487D0
1 changed files with 8 additions and 1 deletions
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9
drivers/spi/spi-imx.c
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@ -281,6 +281,7 @@ static bool spi_imx_can_dma(struct spi_controller *controller, struct spi_device
#define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs & 3) + 4))
#define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs & 3) + 8))
#define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs & 3) + 12))
#define MX51_ECSPI_CONFIG_DATACTL(cs) (1 << ((cs & 3) + 16))
#define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs & 3) + 20))
#define MX51_ECSPI_INT 0x10
@ -573,6 +574,11 @@ static int mx51_ecspi_prepare_message(struct spi_imx_data *spi_imx,
cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(spi_get_chipselect(spi, 0));
}
if (spi->mode & SPI_MOSI_IDLE_LOW)
cfg |= MX51_ECSPI_CONFIG_DATACTL(spi_get_chipselect(spi, 0));
else
cfg &= ~MX51_ECSPI_CONFIG_DATACTL(spi_get_chipselect(spi, 0));
if (spi->mode & SPI_CS_HIGH)
cfg |= MX51_ECSPI_CONFIG_SSBPOL(spi_get_chipselect(spi, 0));
else
@ -1743,7 +1749,8 @@ static int spi_imx_probe(struct platform_device *pdev)
controller->prepare_message = spi_imx_prepare_message;
controller->unprepare_message = spi_imx_unprepare_message;
controller->slave_abort = spi_imx_slave_abort;
controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_NO_CS;
controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_NO_CS |
SPI_MOSI_IDLE_LOW;
if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) ||
is_imx53_ecspi(spi_imx))