[v2,1/7] spi: add support for octal I/O data transfer

Commit Message

Yogesh Narayan Gaur Oct. 15, 2018, 12:14 p.m. UTC

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 <[e-mail]>
---
Changes for v2:
 Incorporated review comments of Boris.

 drivers/spi/spi.c       | 6 ++++++
 include/linux/spi/spi.h | 2 ++
 2 files changed, 8 insertions(+)

Patch

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;