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mtd: spi-nor-core: Add octal mode support

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Add support for Octal flash devices. Octal flash devices use 8 IO lines
for data transfer. Currently only 1-1-8 Octal Read mode is supported.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Vignesh Raghavendra 2019-12-05 15:46:05 +05:30 • committed by Jagan Teki
parent ffab212123
commit 658df8bd94
6 changed files with 43 additions and 2 deletions
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2
include/spi.h
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@ -30,6 +30,8 @@
#define SPI_RX_SLOW BIT(11) /* receive with 1 wire slow */
#define SPI_RX_DUAL BIT(12) /* receive with 2 wires */
#define SPI_RX_QUAD BIT(13) /* receive with 4 wires */
#define SPI_TX_OCTAL BIT(14) /* transmit with 8 wires */
#define SPI_RX_OCTAL BIT(15) /* receive with 8 wires */
/* Header byte that marks the start of the message */
#define SPI_PREAMBLE_END_BYTE 0xec