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Subject[PATCH 12/12] spi: spi-fsl-dspi: Enable extended SPI mode
Date
From: Esben Haabendal <eha@deif.com>

Set the XSPI bit for devices configured for XSPI mode (currently LS1021A),
and thereby switch to extended SPI mode, allowing for SPI transfers using
from 4 to 32 bits per word instead of 4 to 16 bits per word.

Signed-off-by: Esben Haabendal <eha@deif.com>
Cc: Martin Hundebøll <martin@geanix.com>
---
drivers/spi/spi-fsl-dspi.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index eed55491b2c9..1f85dcdb2203 100644
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -46,6 +46,7 @@
#define SPI_MCR_PCSIS (0x3F << 16)
#define SPI_MCR_CLR_TXF (1 << 11)
#define SPI_MCR_CLR_RXF (1 << 10)
+#define SPI_MCR_XSPI (1 << 3)

#define SPI_TCR 0x08
#define SPI_TCR_GET_TCNT(x) (((x) & 0xffff0000) >> 16)
@@ -968,7 +969,8 @@ static const struct regmap_config dspi_xspi_regmap_config[] = {

static void dspi_init(struct fsl_dspi *dspi)
{
- regmap_write(dspi->regmap, SPI_MCR, SPI_MCR_MASTER | SPI_MCR_PCSIS);
+ regmap_write(dspi->regmap, SPI_MCR, SPI_MCR_MASTER | SPI_MCR_PCSIS |
+ (dspi->devtype_data->xspi_mode ? SPI_MCR_XSPI : 0));
regmap_write(dspi->regmap, SPI_SR, SPI_SR_CLEAR);
if (dspi->devtype_data->xspi_mode)
regmap_write(dspi->regmap, SPI_CTARE(0),
--
2.17.1
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