[PATCH v5 0/7] spi: add support for octal mode

Yogesh Narayan Gaur
2018-12-03T08:39:08Z

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 parsing logic for spi-mem framework and m25p80.c device file.
* Add opcodes for octal I/O commands in spi-nor framework, Read and Write proto for (1-1-8/1-8-8) mode.
Opcodes are added as per octal data IO commands required for mt35xu512aba [1] flash.
* 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=70384&state=*
[2] https://patchwork.ozlabs.org/project/linux-mtd/list/?series=76402

Yogesh Gaur (7):
spi: add support for octal mode I/O data transfer
spi: spi-mem: add support for octal mode I/O data transfer
mtd: spi-nor: add opcodes for octal Read/Write commands
mtd: spi-nor: add octal read flag for flash mt35xu512aba
mtd: m25p80: add support of octal mode I/O transfer
spi: nxp-fspi: add octal mode flag bit for octal support
arm64: dts: lx2160a: update fspi node

Changes for v5:
- Modified string 'octo' as 'octal' in all patches.
Changes for v4:
- Rebase on top of v4.20-rc2.
- Modify octo entries enum value in spi.h.
Changes for v3:
- Add octo mode support in spi_setup().
- Rename all patches with 'octal' string modified as 'octo'.
Changes for v2:
- Incorporated review comments of Boris and Vignesh.

drivers/mtd/devices/m25p80.c | 9 ++++++++-
drivers/mtd/spi-nor/spi-nor.c | 19 ++++++++++++++++---
drivers/spi/spi-mem.c | 9 ++++++++-
drivers/spi/spi-nxp-fspi.c | 4 ++--
drivers/spi/spi.c | 12 ++++++++++--
include/linux/mtd/spi-nor.h | 8 ++++++++
include/linux/spi/spi.h | 4 +++-
8 files changed, 59 insertions(+), 10 deletions(-)

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2.7.4