drivers: mspi_sqspi: Use TX direction when there is no data to transfer

anangl · carlescufi · commit 43dfb59c12f0 · 2025-05-29T12:05:40.000+02:00
Set by default the `dir` field in the `nrfx_qspi2_xfer_t` structure
to `NRFX_QSPI2_XFER_DIR_TX` so that for transfers with no data the TX
direction is used. Leaving this field initialized to 0, what means
`NRFX_QSPI2_XFER_DIR_TXRX`, may cause problems with sQSPI v0.1.0 -
an extra pulse on the CS line may appear for SCK frequencies &gt; 8MHz
and this can disturb further communication.

Signed-off-by: Andrzej Głąbek &lt;andrzej.glabek@nordicsemi.no&gt;
diff --git a/drivers/mspi/mspi_sqspi.c b/drivers/mspi/mspi_sqspi.c
@@ -288,6 +288,8 @@ static int process_packet(const struct device *dev,
 {
 	const struct mspi_sqspi_config *dev_config = dev->config;
 	nrfx_qspi2_xfer_t qspi2_xfer = {
+		/* Use TX direction when there is no data to transfer. */
+		.dir = NRFX_QSPI2_XFER_DIR_TX,
 		.cmd = packet->cmd,
 		.address = packet->address,
 		.data_length = packet->num_bytes,

Original file line number	Diff line number	Diff line change
`@@ -288,6 +288,8 @@ static int process_packet(const struct device *dev,`
`288`	`288`	`{`
`289`	`289`	`const struct mspi_sqspi_config *dev_config = dev->config;`
`290`	`290`	`nrfx_qspi2_xfer_t qspi2_xfer = {`
	`291`	`+ /* Use TX direction when there is no data to transfer. */`
	`292`	`+ .dir = NRFX_QSPI2_XFER_DIR_TX,`
`291`	`293`	`.cmd = packet->cmd,`
`292`	`294`	`.address = packet->address,`
`293`	`295`	`.data_length = packet->num_bytes,`