linux-kernel - Re: [PATCH v3 0/7] spi: add support for octo mode

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Message-ID: <468e7b5f-8840-2fce-2b47-325eeed577e4@ti.com>
Date:   Tue, 13 Nov 2018 13:30:24 +0530
From:   Vignesh R <vigneshr@...com>
To:     Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "boris.brezillon@...tlin.com" <boris.brezillon@...tlin.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
CC:     "robh@...nel.org" <robh@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "frieder.schrempf@...eet.de" <frieder.schrempf@...eet.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/7] spi: add support for octo mode

Hi Yogesh

On 23/10/18 3:07 PM, Yogesh Narayan Gaur wrote:
> Add support for octo 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 octo mode flags and parsing of same in spi driver.
> * Add parsing logic for spi-mem framework and m25p80.c device file.
> * Add opcodes for octo 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 octo mode in nxp-fspi driver [2].
> * Define binding property 'spi-rx/tx-bus-width' for LX2160ARDB target [2].
> 

You may have to rebase this series to avoid conflicts with recent spi.h
changes. Also, I suggest merging patches in [1] with this series if you
plan to post another version so that all bits are at one place.

Regards
Vignesh

> Cherry pick below 2 patches (from: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git):
>     c639f871febe6667d9afce28108c634e5636c735 spi: spi-mem: Fix inverted logic in op sanity check
>     db122eb8a749a1eff038f9a282c620ab16c4be1d spi: spi-mem: Add extra sanity checks on the op param
> 
> Tested on LX2160ARDB target with nxp-fspi driver, below are
> Read performance number of 1-1-1 and 1-1-8 read protocol.
> 
>  root@...x:~# cat /proc/mtd
>  dev:    size   erasesize  name
>  mtd0: 04000000 00001000 "spi0.0"
>  mtd1: 04000000 00001000 "spi0.1"
>  root@...x:~# 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@...x:~# 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@...012ardb:~#
> 
>  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
> [2] https://patchwork.ozlabs.org/project/linux-mtd/list/?series=72181
> 
> Yogesh Gaur (7):
>   spi: add support for octo mode I/O data transfer
>   spi: spi-mem: add support for octo mode I/O data transfer
>   mtd: spi-nor: add opcodes for octo Read/Write commands
>   mtd: spi-nor: add octo read flag for flash mt35xu512aba
>   mtd: m25p80: add support of octo mode I/O transfer
>   spi: nxp-fspi: add octo mode flag bit for octal support
>   arm64: dts: lx2160a: update fspi node
> 
> 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.
> 
>  arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts |  4 ++++
>  drivers/mtd/devices/m25p80.c                      |  9 ++++++++-
>  drivers/mtd/spi-nor/spi-nor.c                     | 15 ++++++++++++++-
>  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                           |  2 ++
>  8 files changed, 56 insertions(+), 7 deletions(-)
> 

-- 
Regards
Vignesh