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

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Message-Id: <1549205792.1588.0@crapouillou.net>
Date:   Sun, 03 Feb 2019 11:56:32 -0300
From:   Paul Cercueil <paul@...pouillou.net>
To:     Boris Brezillon <bbrezillon@...nel.org>
Cc:     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>,
        Miquel Raynal <miquel.raynal@...tlin.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 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.