linux-kernel - Re: [PATCH v3 0/3] mtd: nand: Rework/cleanup the Atmel NAND driver

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Date:   Wed, 29 Mar 2017 22:05:22 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>,
        linux-mtd@...ts.infradead.org,
        Nicolas Ferre <nicolas.ferre@...el.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Haavard Skinnemoen <hskinnemoen@...il.com>,
        Hans-Christian Egtvedt <egtvedt@...fundet.no>,
        linux-kernel@...r.kernel.org, Wenyou Yang <wenyou.yang@...el.com>,
        Josh Wu <rainyfeeling@...look.com>
Cc:     Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org,
        Pawel Moll <pawel.moll@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Kumar Gala <galak@...eaurora.org>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 0/3] mtd: nand: Rework/cleanup the Atmel NAND driver

On Thu, 16 Mar 2017 09:02:39 +0100
Boris Brezillon <boris.brezillon@...e-electrons.com> wrote:

> This is a complete rewrite of the driver whose main purpose is to
> support the new DT representation where the NAND controller node is now
> really visible in the DT and appears under the EBI bus. With this new
> representation, we can add other devices under the EBI bus without
> risking pinmuxing conflicts (the NAND controller is under the EBI
> bus logic and as such, share some of its pins with other devices
> connected on this bus).
> 
> Even though the goal of this rework was not necessarily to add new
> features, the new driver has been designed with this in mind. With a
> clearer separation between the different blocks and different IP
> revisions, adding new functionalities should be easier (we already
> have plans to support SMC timing configuration so that we no longer
> have to rely on the configuration done by the bootloader/bootstrap).
> 
> Also note that we no longer have a custom ->cmdfunc() implementation,
> which means we can now benefit from new features added in the core
> implementation for free (support for new NAND operations for example).
> 
> The last thing that we gain with this rework is support for multi-chips
> and multi-dies chips, thanks to the clean NAND controller <-> NAND
> devices representation.
> 
> This new driver has been tested on several platforms (at91sam9261,
> at91sam9g45, at91sam9x5, sama5d3 and sama5d4) to make sure it did not
> introduce regressions, and it's worth mentioning that old bindings are
> still supported (which partly explain the positive diffstat).

Applied the whole series.

> 
> Regards,
> 
> Boris
> 
> Changes since v2:
> - add error messages when the NFC reports an error
> - drop AVR32 compat code
> - add acks
> - minor coding style fixes
> 
> Changes since v1:
> - change function/structure prefixes (asked by Nicolas)
> - drop applied patches
> - use new GPIO helpers
> - set ->chip_delay to 40 as done in the old driver (reported by Nicolas)
> - rework read_page to improve perfs
> - add a better commit message to patch 2
> 
> Boris Brezillon (3):
>   mtd: nand: Cleanup/rework the atmel_nand driver
>   mtd: nand: atmel: Document the new DT bindings
>   mtd: nand: Remove unused chip->write_page() hook
> 
>  .../devicetree/bindings/mtd/atmel-nand.txt         |  107 +-
>  MAINTAINERS                                        |    2 +-
>  drivers/mtd/nand/Kconfig                           |    6 +-
>  drivers/mtd/nand/Makefile                          |    2 +-
>  drivers/mtd/nand/atmel/Makefile                    |    4 +
>  drivers/mtd/nand/atmel/nand-controller.c           | 2198 +++++++++++++++++
>  drivers/mtd/nand/atmel/pmecc.c                     | 1020 ++++++++
>  drivers/mtd/nand/atmel/pmecc.h                     |   73 +
>  drivers/mtd/nand/atmel_nand.c                      | 2479 --------------------
>  drivers/mtd/nand/atmel_nand_ecc.h                  |  163 --
>  drivers/mtd/nand/atmel_nand_nfc.h                  |  103 -
>  drivers/mtd/nand/nand_base.c                       |   12 +-
>  include/linux/mtd/nand.h                           |    4 -
>  13 files changed, 3411 insertions(+), 2762 deletions(-)
>  create mode 100644 drivers/mtd/nand/atmel/Makefile
>  create mode 100644 drivers/mtd/nand/atmel/nand-controller.c
>  create mode 100644 drivers/mtd/nand/atmel/pmecc.c
>  create mode 100644 drivers/mtd/nand/atmel/pmecc.h
>  delete mode 100644 drivers/mtd/nand/atmel_nand.c
>  delete mode 100644 drivers/mtd/nand/atmel_nand_ecc.h
>  delete mode 100644 drivers/mtd/nand/atmel_nand_nfc.h
>