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spi: spi-fsl-dspi: Add comments around dspi_pop_tx and dspi_push_rx functions

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Their names are confusing, since dspi_pop_tx prepares a word to be
written to the PUSHR register, and dspi_push_rx gets a word from the
POPR register.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20200304220044.11193-5-olteanv@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Vladimir Oltean 2020-03-05 00:00:36 +02:00 committed by Mark Brown
parent 5542bd7971
commit 8f8303ee05
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1 changed files with 6 additions and 0 deletions
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6
drivers/spi/spi-fsl-dspi.c
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@ -245,6 +245,10 @@ struct fsl_dspi {
struct fsl_dspi_dma *dma;
};
/*
* Pop one word from the TX buffer for pushing into the
* PUSHR register (TX FIFO)
*/
static u32 dspi_pop_tx(struct fsl_dspi *dspi)
{
u32 txdata = 0;
@ -257,6 +261,7 @@ static u32 dspi_pop_tx(struct fsl_dspi *dspi)
return txdata;
}
/* Prepare one TX FIFO entry (txdata plus cmd) */
static u32 dspi_pop_tx_pushr(struct fsl_dspi *dspi)
{
u16 cmd = dspi->tx_cmd, data = dspi_pop_tx(dspi);
@ -269,6 +274,7 @@ static u32 dspi_pop_tx_pushr(struct fsl_dspi *dspi)
return cmd << 16 | data;
}
/* Push one word to the RX buffer from the POPR register (RX FIFO) */
static void dspi_push_rx(struct fsl_dspi *dspi, u32 rxdata)
{
if (!dspi->rx)