spi/imx: set the inactive state of the clock according to the clock polarity

There are SPI devices which need a SPI clock with active low polarity and
high inactive state.

Add the setting of the inactive state ECSPIx_CONFIGREG:SCLK CTL
according to the clock polarity ECSPIx_CONFIGREG:SCLK POL:

DT without "spi-cpol" = 0 = clock active high polarity = inactive state low
DT with    "spi-cpol" = 1 = clock active low  polarity = inactive state high

Signed-off-by: Knut Wohlrab <knut.wohlrab@de.bosch.com>
Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index e834ff8c0188..d64655b70b59 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -197,6 +197,7 @@ static unsigned int spi_imx_clkdiv_2(unsigned int fin,
 #define MX51_ECSPI_CONFIG_SCLKPOL(cs)   (1 << ((cs) +  4))
 #define MX51_ECSPI_CONFIG_SBBCTRL(cs)   (1 << ((cs) +  8))
 #define MX51_ECSPI_CONFIG_SSBPOL(cs)    (1 << ((cs) + 12))
+#define MX51_ECSPI_CONFIG_SCLKCTL(cs)   (1 << ((cs) + 20))
 
 #define MX51_ECSPI_INT          0x10
 #define MX51_ECSPI_INT_TEEN             (1 <<  0)
@@ -287,9 +288,10 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
         if (config->mode & SPI_CPHA)
                 cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs);
 
-        if (config->mode & SPI_CPOL)
+        if (config->mode & SPI_CPOL) {
                 cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs);
-
+                cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs);
+        }
         if (config->mode & SPI_CS_HIGH)
                 cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs);