Commit c09b890b authored by Knut Wohlrab's avatar Knut Wohlrab Committed by Mark Brown
Browse files

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: default avatarKnut Wohlrab <knut.wohlrab@de.bosch.com>
Signed-off-by: default avatarDirk Behme <dirk.behme@de.bosch.com>
Acked-by: default avatarShawn Guo <shawn.guo@linaro.org>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent ada7aec7

drivers/spi/spi-imx.c

+4 −2
Original line number Original line Diff line number Diff line
@@ -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_SCLKPOL(cs)	(1 << ((cs) +  4))

#define MX51_ECSPI_CONFIG_SBBCTRL(cs)	(1 << ((cs) +  8))

#define MX51_ECSPI_CONFIG_SBBCTRL(cs)	(1 << ((cs) +  8))

#define MX51_ECSPI_CONFIG_SSBPOL(cs)	(1 << ((cs) + 12))

#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		0x10

#define MX51_ECSPI_INT_TEEN		(1 <<  0)

#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)

	if (config->mode & SPI_CPHA)

		cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs);

		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_SCLKPOL(config->cs);



		cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs);

	}

	if (config->mode & SPI_CS_HIGH)

	if (config->mode & SPI_CS_HIGH)

		cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs);

		cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs);

CRA Git | Maintained and supported by SUSTech CRA and CCSE