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drivers: spi: gecko: add support for CPOL and CPHA

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This commit adds support for CPOL/CPHA configuration in the Gecko SPI
driver.

Signed-off-by: Pawel Czarnecki <pczarnecki@antmicro.com>
This commit is contained in:
Pawel Czarnecki 2022-10-19 15:11:06 +02:00 • committed by Maureen Helm
commit 06245f3653
1 changed files with 14 additions and 5 deletions
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19
drivers/spi/spi_gecko.c
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@ -95,11 +95,6 @@ static int spi_config(const struct device *dev,
return -ENOTSUP;
}
if (config->operation & (SPI_MODE_CPOL | SPI_MODE_CPHA)) {
LOG_ERR("Only supports CPOL=CPHA=0");
return -ENOTSUP;
}
if (config->operation & SPI_OP_MODE_SLAVE) {
LOG_ERR("Slave mode not supported");
return -ENOTSUP;
@ -112,6 +107,20 @@ static int spi_config(const struct device *dev,
gecko_config->base->CTRL &= ~USART_CTRL_LOOPBK;
}
/* Set CPOL */
if (config->operation & SPI_MODE_CPOL) {
gecko_config->base->CTRL |= USART_CTRL_CLKPOL;
} else {
gecko_config->base->CTRL &= ~USART_CTRL_CLKPOL;
}
/* Set CPHA */
if (config->operation & SPI_MODE_CPHA) {
gecko_config->base->CTRL |= USART_CTRL_CLKPHA;
} else {
gecko_config->base->CTRL &= ~USART_CTRL_CLKPHA;
}
/* Set word size */
gecko_config->base->FRAME = usartDatabits8
| USART_FRAME_STOPBITS_DEFAULT