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authorKnut Wohlrab <knut.wohlrab@de.bosch.com>2012-09-25 13:21:57 +0200
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-09-28 14:05:08 +0100
commitc09b890b763df3ccd79a2c34c2f1abeb73179caf (patch)
tree7fd59d180a85f6d3b5c9e150dc4f8669b78a2681 /drivers/spi
parentada7aec7eec0ca2d2a9d2208548813d5dda8108e (diff)
downloadlinux-linaro-stable-c09b890b763df3ccd79a2c34c2f1abeb73179caf.tar.gz
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>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-imx.c6
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);