[PATCH 1/4] spi: add support for octal I/O data transfer

Yogesh Gaur
2018-10-04T08:48:37Z

Add flags for Octal I/O data transfer
Required for the SPI controller which can do the data transfer (TX/RX)
on 8 data lines e.g. NXP FlexSPI controller.
SPI_TX_OCTAL: transmit with 8 wires
SPI_RX_OCTAL: receive with 8 wires

Signed-off-by: Yogesh Gaur <yogeshnarayan.gaur@nxp.com>
---
drivers/spi/spi.c | 6 ++++++
include/linux/spi/spi.h | 2 ++
2 files changed, 8 insertions(+)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index ec395a6..80f672f 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1573,6 +1573,9 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi,
case 4:
spi->mode |= SPI_TX_QUAD;
break;
+ case 8:
+ spi->mode |= SPI_TX_OCTAL;
+ break;
default:
dev_warn(&ctlr->dev,
"spi-tx-bus-width %d not supported\n",
@@ -1591,6 +1594,9 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi,
case 4:
spi->mode |= SPI_RX_QUAD;
break;
+ case 8:
+ spi->mode |= SPI_RX_OCTAL;
+ break;
default:
dev_warn(&ctlr->dev,
"spi-rx-bus-width %d not supported\n",
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index a64235e..2d21307 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -163,6 +163,8 @@ struct spi_device {
#define SPI_TX_QUAD 0x200 /* transmit with 4 wires */
#define SPI_RX_DUAL 0x400 /* receive with 2 wires */
#define SPI_RX_QUAD 0x800 /* receive with 4 wires */
+#define SPI_TX_OCTAL 0x1000 /* transmit with 8 wires */
+#define SPI_RX_OCTAL 0x2000 /* receive with 8 wires */
int irq;
void *controller_state;
void *controller_data;
--
2.7.4