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drivers: spi_mcux_lpspi: Fix DMA path on RT 

Apparently, the previous change to fix the chip select only works on
some newer revisions of the LPSPI, and the behavior is different on
older parts like RT. For now put some #ifdef to keep the fixed CS on
MCXN but have the old behavior on RT and other platforms.

Signed-off-by: Declan Snyder <declan.snyder@nxp.com>
This commit is contained in:
Declan Snyder 2024-11-08 14:50:16 -06:00 committed by Mahesh Mahadevan
parent b6b8eeedf0
commit 92d0287813
1 changed files with 10 additions and 0 deletions
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10
drivers/spi/spi_mcux_lpspi.c
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@ -483,7 +483,9 @@ static int transceive_dma(const struct device *dev, const struct spi_config *spi
return ret;
}
#ifdef CONFIG_SOC_SERIES_MCXN
base->TCR |= LPSPI_TCR_CONT_MASK;
#endif
/* DMA is fast enough watermarks are not required */
LPSPI_SetFifoWatermarks(base, 0U, 0U);
@ -500,9 +502,11 @@ static int transceive_dma(const struct device *dev, const struct spi_config *spi
goto out;
}
#ifdef CONFIG_SOC_SERIES_MCXN
while (!(LPSPI_GetStatusFlags(base) & kLPSPI_TxDataRequestFlag)) {
/* wait until previous tx finished */
}
#endif
/* Enable DMA Requests */
LPSPI_EnableDMA(base, kLPSPI_TxDmaEnable | kLPSPI_RxDmaEnable);
@ -513,6 +517,12 @@ static int transceive_dma(const struct device *dev, const struct spi_config *spi
goto out;
}
#ifndef CONFIG_SOC_SERIES_MCXN
while ((LPSPI_GetStatusFlags(base) & kLPSPI_ModuleBusyFlag)) {
/* wait until module is idle */
}
#endif
/* Disable DMA */
LPSPI_DisableDMA(base, kLPSPI_TxDmaEnable | kLPSPI_RxDmaEnable);