[PATCH AUTOSEL 6.6 07/12] spi: Fix OCTAL mode support

[Sasha Levin <sashal@xxxxxxxxxx>]

From: Patrice Chotard <patrice.chotard@xxxxxxxxxxx>

[ Upstream commit d6a711a898672dd873aab3844f754a3ca40723a5 ]

Add OCTAL mode support.
Issue detected using "--octal" spidev_test's option.

Signed-off-by: Patrice Chotard <patrice.chotard@xxxxxxxxxxx>
Link: https://msgid.link/r/20240618132951.2743935-4-patrice.chotard@xxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/spi/spi.c       | 6 ++++--
 include/linux/spi/spi.h | 5 +++--
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index da15c3f388d1f..5c57c7378ee70 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -4000,7 +4000,8 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message)
 				return -EINVAL;
 			if (xfer->tx_nbits != SPI_NBITS_SINGLE &&
 				xfer->tx_nbits != SPI_NBITS_DUAL &&
-				xfer->tx_nbits != SPI_NBITS_QUAD)
+				xfer->tx_nbits != SPI_NBITS_QUAD &&
+				xfer->tx_nbits != SPI_NBITS_OCTAL)
 				return -EINVAL;
 			if ((xfer->tx_nbits == SPI_NBITS_DUAL) &&
 				!(spi->mode & (SPI_TX_DUAL | SPI_TX_QUAD)))
@@ -4015,7 +4016,8 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message)
 				return -EINVAL;
 			if (xfer->rx_nbits != SPI_NBITS_SINGLE &&
 				xfer->rx_nbits != SPI_NBITS_DUAL &&
-				xfer->rx_nbits != SPI_NBITS_QUAD)
+				xfer->rx_nbits != SPI_NBITS_QUAD &&
+				xfer->rx_nbits != SPI_NBITS_OCTAL)
 				return -EINVAL;
 			if ((xfer->rx_nbits == SPI_NBITS_DUAL) &&
 				!(spi->mode & (SPI_RX_DUAL | SPI_RX_QUAD)))
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 8cc7a99927f95..e5baf43bcfbb6 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -1049,12 +1049,13 @@ struct spi_transfer {
 	unsigned	dummy_data:1;
 	unsigned	cs_off:1;
 	unsigned	cs_change:1;
-	unsigned	tx_nbits:3;
-	unsigned	rx_nbits:3;
+	unsigned	tx_nbits:4;
+	unsigned	rx_nbits:4;
 	unsigned	timestamped:1;
 #define	SPI_NBITS_SINGLE	0x01 /* 1-bit transfer */
 #define	SPI_NBITS_DUAL		0x02 /* 2-bit transfer */
 #define	SPI_NBITS_QUAD		0x04 /* 4-bit transfer */
+#define	SPI_NBITS_OCTAL	0x08 /* 8-bit transfer */
 	u8		bits_per_word;
 	struct spi_delay	delay;
 	struct spi_delay	cs_change_delay;
-- 
2.43.0