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
