linux-kernel - Re: [PATCH v2 9/9] mtd: rawnand: jz4780-bch: Add support for the JZ4740

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Message-Id: <1549208490.1588.1@crapouillou.net>
Date:   Sun, 03 Feb 2019 12:41:30 -0300
From:   Paul Cercueil <paul@...pouillou.net>
To:     Boris Brezillon <bbrezillon@...nel.org>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Harvey Hunt <harveyhuntnexus@...il.com>,
        Mathieu Malaterre <malat@...ian.org>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 9/9] mtd: rawnand: jz4780-bch: Add support for the
 JZ4740



Le dim. 3 févr. 2019 à 12:07, Boris Brezillon <bbrezillon@...nel.org> 
a écrit :
> On Sun, 03 Feb 2019 11:56:32 -0300
> Paul Cercueil <paul@...pouillou.net> wrote:
> 
>>  Le dim. 3 févr. 2019 à 11:16, Boris Brezillon 
>> <bbrezillon@...nel.org>
>>  a écrit :
>>  > On Sun, 03 Feb 2019 10:58:13 -0300
>>  > Paul Cercueil <paul@...pouillou.net> wrote:
>>  >
>>  >>  Le dim. 3 févr. 2019 à 4:35, Boris Brezillon
>>  >> <bbrezillon@...nel.org>
>>  >>  a écrit :
>>  >>  > On Sat,  2 Feb 2019 20:19:26 -0300
>>  >>  > Paul Cercueil <paul@...pouillou.net> wrote:
>>  >>  >
>>  >>  >>  Add the backend code for the jz4780-bch driver to support 
>> the
>>  >> JZ4740
>>  >>  >>  SoC from Ingenic.
>>  >>  >>
>>  >>  >>  Signed-off-by: Paul Cercueil <paul@...pouillou.net>
>>  >>  >>  ---
>>  >>  >>
>>  >>  >>  Changes:
>>  >>  >>
>>  >>  >>  v2: New patch
>>  >>  >>
>>  >>  >>   drivers/mtd/nand/raw/ingenic/Makefile         |   2 +-
>>  >>  >>   drivers/mtd/nand/raw/ingenic/jz4740_bch.c     | 173
>>  >>  >> ++++++++++++++++++
>>  >>  >>   .../mtd/nand/raw/ingenic/jz4780_bch_common.c  |   1 +
>>  >>  >>   .../nand/raw/ingenic/jz4780_bch_internal.h    |   1 +
>>  >>  >>   4 files changed, 176 insertions(+), 1 deletion(-)
>>  >>  >>   create mode 100644 
>> drivers/mtd/nand/raw/ingenic/jz4740_bch.c
>>  >>  >>
>>  >>  >>  diff --git a/drivers/mtd/nand/raw/ingenic/Makefile
>>  >>  >> b/drivers/mtd/nand/raw/ingenic/Makefile
>>  >>  >>  index f38b467490cf..d16c96113a93 100644
>>  >>  >>  --- a/drivers/mtd/nand/raw/ingenic/Makefile
>>  >>  >>  +++ b/drivers/mtd/nand/raw/ingenic/Makefile
>>  >>  >>  @@ -1,3 +1,3 @@
>>  >>  >>   obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o
>>  >>  >>   obj-$(CONFIG_MTD_NAND_JZ4780) += jz4780_nand.o
>>  >> jz4780_bch_common.o
>>  >>  >> \
>>  >>  >>  -				 jz4780_bch.o jz4725b_bch.o
>>  >>  >>  +				 jz4780_bch.o jz4725b_bch.o jz4740_bch.o
>>  >>  >
>>  >>  > I still don't see the point of the 
>> jz4780_bch_common/jz47xxx_bch
>>  >>  > separation. You seem to always embed all objects anyway, so 
>> you
>>  >> can
>>  >>  > just put the code for both engines in the same source file and
>>  >> decide
>>  >>  > which one to use based on the compat (which you already do
>>  >> anyway).
>>  >>
>>  >>  Each SoC has a different set of registers for the BCH hardware. 
>> I
>>  >> can
>>  >>  try to
>>  >>  cram everything into one file, but it won't be that much 
>> cleaner.
>>  >
>>  > Then maybe they deserve separate drivers/modules.
>>  >
>>  > BTW, didn't you say that one IP uses Reed-Salomon instead of BCH. 
>> I'd
>>  > suggest prefixing structs and functions with jz47xx_ecc instead of
>>  > jz47xx_bch and naming the common part jz47xx_ecc.c to reflect 
>> that.
>> 
>>  Would it be a good idea to make a generic ECC API that the 
>> jz47xx_nand
>>  driver could use? Then the three jz47xx BCH codepaths could be 
>> separate
>>  drivers that register with the generic ECC core.
> 
> Definitely. Actually, Miquel is already working on that, but I don't
> think it's a good idea to wait for this new framework to be finished 
> to
> get your changes merged. So I'd recommend having a jz specific ECC API
> (pretty much the one you have in the common file expect it would be
> prefixed with _ecc instead of _bch) and convert it to the generic
> approach afterwards. Given the size of the common.c file, you can even
> put everything in jz47xx_ecc.h as inline funcs to avoid having yet
> another module.

Ok, perfect, I'll do that.
Thank you for your input!