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

Vignesh R
2018-10-04T09:22:18Z

Hi Yogesh,

On Thursday 04 October 2018 02:18 PM, Yogesh Gaur wrote:
> 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

This is a bit confusing and difficult to follow. I suggest to order
patches such that spi-nor layer changes are at the first, then m25p80
related things, followed by spi-mem (if needed spi) changes and finally
spi-mem controller driver changes.

--
Regards
Vignesh