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drivers: spi_mcux_lpspi: fix baudrate change when switching devices

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When configuring an LPSPI module for a new device with different baud rate,
the module needs to be disabled for the baud rate change to take effect.
This adds the necessary call to LPSPI_Enable before initializing the
module.

Fixes #51177

Signed-off-by: Jonas Otto <jonas@jonasotto.com>
This commit is contained in:
Jonas Otto 2022-11-29 15:01:31 +01:00 • committed by Carles Cufí
commit d3415e2ce1
1 changed files with 9 additions and 0 deletions
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9
drivers/spi/spi_mcux_lpspi.c
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@ -226,6 +226,15 @@ static int spi_mcux_configure(const struct device *dev,
return -EINVAL;
}
/* Setting the baud rate in LPSPI_MasterInit requires module to be disabled */
LPSPI_Enable(base, false);
while ((base->CR & LPSPI_CR_MEN_MASK) != 0U) {
/* Wait until LPSPI is disabled. Datasheet:
* After writing 0, MEN (Module Enable) remains set until the LPSPI has completed
* the current transfer and is idle.
*/
}
LPSPI_MasterInit(base, &master_config, clock_freq);
LPSPI_MasterTransferCreateHandle(base, &data->handle,