Subject: Re: [PATCH v2 10/36] mtd: nand: Introduce the ECC engine abstraction

From: Boris Brezillon <[email-masked]>
Date: Sun, 31 Mar 2019 14:10:25 +0200

On Mon,  4 Mar 2019 23:28:15 +0100
Miquel Raynal <[email-masked]> wrote:

> Create a generic ECC engine object.
> 
> Later the ecc/engine.c file will receive more generic code coming from
> the raw NAND specific part. This is a base to instantiate ECC engine
> objects.
> 
> Signed-off-by: Miquel Raynal <[email-masked]>
> ---
>  drivers/mtd/nand/Kconfig                     |   1 +
>  drivers/mtd/nand/Makefile                    |   1 +
>  drivers/mtd/nand/ecc/Kconfig                 |   6 +
>  drivers/mtd/nand/ecc/Makefile                |   3 +
>  drivers/mtd/nand/ecc/engine.c                | 138 +++++++++++++++++++
>  drivers/mtd/nand/raw/atmel/nand-controller.c |   9 +-
>  drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c   |  12 +-
>  drivers/mtd/nand/raw/marvell_nand.c          |   7 +-
>  drivers/mtd/nand/raw/mtk_nand.c              |   4 +-
>  drivers/mtd/nand/raw/nand_base.c             |  17 +--
>  drivers/mtd/nand/raw/nand_esmt.c             |  11 +-
>  drivers/mtd/nand/raw/nand_hynix.c            |  41 +++---
>  drivers/mtd/nand/raw/nand_jedec.c            |   4 +-
>  drivers/mtd/nand/raw/nand_micron.c           |  14 +-
>  drivers/mtd/nand/raw/nand_onfi.c             |   8 +-
>  drivers/mtd/nand/raw/nand_samsung.c          |  19 +--
>  drivers/mtd/nand/raw/nand_toshiba.c          |  11 +-
>  drivers/mtd/nand/raw/sunxi_nand.c            |   5 +-
>  drivers/mtd/nand/raw/tegra_nand.c            |   9 +-
>  drivers/mtd/nand/spi/core.c                  |   4 +-
>  drivers/mtd/nand/spi/macronix.c              |   6 +-
>  drivers/mtd/nand/spi/toshiba.c               |   6 +-

Can we please split that in 3 patches:

1/ introduce the ECC framework
2/ convert spi nand
3/ convert raw nand

>  include/linux/mtd/nand.h                     |  82 ++++++++++-
>  include/linux/mtd/spinand.h                  |   2 +-
>  24 files changed, 327 insertions(+), 93 deletions(-)
>  create mode 100644 drivers/mtd/nand/ecc/Kconfig
>  create mode 100644 drivers/mtd/nand/ecc/Makefile
>  create mode 100644 drivers/mtd/nand/ecc/engine.c
> 
> diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
> index d2ef8b89568e..75d0bd18b818 100644
> --- a/drivers/mtd/nand/Kconfig
> +++ b/drivers/mtd/nand/Kconfig
> @@ -6,5 +6,6 @@ config MTD_NAND_CORE
>  source "drivers/mtd/nand/onenand/Kconfig"
>  source "drivers/mtd/nand/raw/Kconfig"
>  source "drivers/mtd/nand/spi/Kconfig"
> +source "drivers/mtd/nand/ecc/Kconfig"
>  
>  endmenu
> diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
> index 7ecd80c0a66e..9772e781534d 100644
> --- a/drivers/mtd/nand/Makefile
> +++ b/drivers/mtd/nand/Makefile
> @@ -6,3 +6,4 @@ obj-$(CONFIG_MTD_NAND_CORE) += nandcore.o
>  obj-y	+= onenand/
>  obj-y	+= raw/
>  obj-y	+= spi/
> +obj-y	+= ecc/
> diff --git a/drivers/mtd/nand/ecc/Kconfig b/drivers/mtd/nand/ecc/Kconfig
> new file mode 100644
> index 000000000000..01439f66ecbf
> --- /dev/null
> +++ b/drivers/mtd/nand/ecc/Kconfig
> @@ -0,0 +1,6 @@
> +menu "ECC engine support"
> +
> +config MTD_NAND_ECC
> +	tristate
> +

There's already an MTD_NAND_ECC symbol defined in
drivers/mtd/nand/raw/Kconfig, plus I don't think we want ecc/engine.c
to be compiled as a module, but instead be embedded in nand-core.ko.
Not to mention that the name, engine.ko, is probably too generic.

> +endmenu
> diff --git a/drivers/mtd/nand/ecc/Makefile b/drivers/mtd/nand/ecc/Makefile
> new file mode 100644
> index 000000000000..c7367f834d81
> --- /dev/null
> +++ b/drivers/mtd/nand/ecc/Makefile
> @@ -0,0 +1,3 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +obj-$(CONFIG_MTD_NAND_ECC)		+= engine.o

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