Am 2020-03-09 15:56, schrieb Vladimir Oltean:
From: Vladimir Oltean <vladimir.oltean@xxxxxxx>
The SPI_MCR_PCSIS macro assumes that the controller has a number of
chip
select signals equal to 6. That is not always the case, but actually is
described through the driver-specific " signals equal to 6. That is not
always the case, but actually is described through the driver-specific
"spi-num-chipselects" device tree binding.
Repeated sentence? Was this your intention?
-michael
LS1028A for example only has
4 chip selects.
Don't write to the upper bits of the PCSIS field, which are reserved in
the reference manual.
Fixes: 349ad66c0ab0 ("spi:Add Freescale DSPI driver for Vybrid VF610
platform")
Signed-off-by: Vladimir Oltean <vladimir.oltean@xxxxxxx>
---
drivers/spi/spi-fsl-dspi.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index 0683a3fbd48c..0ce26c1cbf62 100644
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -22,7 +22,7 @@
#define SPI_MCR 0x00
#define SPI_MCR_MASTER BIT(31)
-#define SPI_MCR_PCSIS (0x3F << 16)
+#define SPI_MCR_PCSIS(x) ((x) << 16)
#define SPI_MCR_CLR_TXF BIT(11)
#define SPI_MCR_CLR_RXF BIT(10)
#define SPI_MCR_XSPI BIT(3)
@@ -1197,7 +1197,10 @@ static const struct regmap_config
dspi_xspi_regmap_config[] = {
static void dspi_init(struct fsl_dspi *dspi)
{
- unsigned int mcr = SPI_MCR_PCSIS;
+ unsigned int mcr;
+
+ /* Set idle states for all chip select signals to high */
+ mcr = SPI_MCR_PCSIS(GENMASK(dspi->ctlr->num_chipselect - 1, 0));
if (dspi->devtype_data->trans_mode == DSPI_XSPI_MODE)
mcr |= SPI_MCR_XSPI;
