[PATCH 0/4] spi: add support for octal mode data transfer

Yogesh Gaur
2018-10-04T08:48:36Z

Add support for octal mode IO data transfer.
Micron flash, mt35xu512aba, supports octal mode data transfer and
NXP FlexSPI controller supports 8 data lines for data transfer (Rx/Tx).

Patch series
* Add support for octal mode flags and parsing of same in spi driver.
* Add octal data communication commands required for mt35xu512aba [1] flash.
* Add support for Read and Write proto for (1-1-8/1-8-8) mode.
* Add mode bit required for octal mode in nxp-fspi driver [2].
* Define binding property 'spi-rx/tx-bus-width' for LX2160ARDB target [2].

Tested on LX2160ARDB target with nxp-fspi driver, below are
Read performance number of 1-1-1 and 1-1-8 read protocol.

root@lxxx:~# cat /proc/mtd
dev: size erasesize name
mtd0: 04000000 00001000 "spi0.0"
mtd1: 04000000 00001000 "spi0.1"
root@lxxx:~# time mtd_debug read /dev/mtd0 0x0 0x1000000 0read
Copied 16777216 bytes from address 0x00000000 in flash to 0read

real 0m2.792s
user 0m0.000s
sys 0m2.790s
root@lxxx:~# time mtd_debug read /dev/mtd1 0x0 0x1000000 0read
Copied 16777216 bytes from address 0x00000000 in flash to 0read

real 0m0.441s
user 0m0.000s
sys 0m0.440s
root@ls1012ardb:~#

Flash device MTD0 configured in 1-1-1 protocol.
Flash device MTD1 configured in 1-1-8 protocol.

[1] https://patchwork.ozlabs.org/project/linux-mtd/list/?series=66317
[2] https://patchwork.ozlabs.org/project/linux-mtd/list/?series=66887

Yogesh Gaur (4):
spi: add support for octal I/O data transfer
mtd: spi-nor: add support for octal mode data transfer
spi: nxp-fspi: add mode flag bit for octal support
arm64: dts: lx2160a: update fspi node

arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts | 4 ++++
drivers/mtd/devices/m25p80.c | 9 ++++++++-
drivers/mtd/spi-nor/spi-nor.c | 14 +++++++++++++-
drivers/spi/spi-nxp-fspi.c | 4 ++--
drivers/spi/spi.c | 6 ++++++
include/linux/mtd/spi-nor.h | 8 ++++++++
include/linux/spi/spi.h | 2 ++
7 files changed, 43 insertions(+), 4 deletions(-)

--
2.7.4