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fsl_dspi: Introduce DT bindings for CS-SCK and SCK-CS delays

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Communication with some SPI slaves just won't cut it if these delays
(before the beginning, and after the end of a transfer) are not added to
the Chip Select signal.

These are a straight copy from Linux:
Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt
drivers/spi/spi-fsl-dspi.c

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
[Rebased]
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
This commit is contained in:
Vladimir Oltean
2020-05-04 11:24:26 +03:00
committed by Priyanka Jain
parent ada61f1ee2
commit e7005b3e80
3 changed files with 58 additions and 1 deletions
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include/fsl_dspi.h
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@@ -94,6 +94,7 @@ struct dspi {
#define DSPI_CTAR_ASC(x) (((x) & 0x0F) << 8)
#define DSPI_CTAR_DT(x) (((x) & 0x0F) << 4)
#define DSPI_CTAR_BR(x) ((x) & 0x0F)
#define DSPI_CTAR_SCALE_BITS 0xf
/* Status */
#define DSPI_SR_TCF 0x80000000