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| author | Knut Wohlrab <knut.wohlrab@de.bosch.com> | 2012-09-25 13:21:57 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-09-28 15:05:08 +0200 |
| commit | c09b890b763df3ccd79a2c34c2f1abeb73179caf (patch) | |
| tree | 7fd59d180a85f6d3b5c9e150dc4f8669b78a2681 /drivers/spi | |
| parent | spi/pl022: get/put resources on suspend/resume (diff) | |
| download | linux-c09b890b763df3ccd79a2c34c2f1abeb73179caf.tar.xz linux-c09b890b763df3ccd79a2c34c2f1abeb73179caf.zip | |
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.c | 6 |
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); |