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

Boris Brezillon
2019-02-03T14:16:33Z

On Sun, 03 Feb 2019 10:58:13 -0300
Paul Cercueil <paul@crapouillou.net> wrote:

> Le dim. 3 févr. 2019 à 4:35, Boris Brezillon <bbrezillon@kernel.org>
> a écrit :
> > On Sat, 2 Feb 2019 20:19:26 -0300
> > Paul Cercueil <paul@crapouillou.net> wrote:
> >
> >> Add the backend code for the jz4780-bch driver to support the JZ4740
> >> SoC from Ingenic.
> >>
> >> Signed-off-by: Paul Cercueil <paul@crapouillou.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.