linux-kernel - RE: [EXT] Re: [PATCH 1/8] mtd: nand: move ONFI related functions to onfi.h

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Date:   Mon, 19 Aug 2019 08:35:22 +0000
From:   "Shivamurthy Shastri (sshivamurthy)" <sshivamurthy@...ron.com>
To:     'Miquel Raynal' <miquel.raynal@...tlin.com>
CC:     Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jeff Kletsky <git-commits@...ycomm.com>,
        Chuanhong Guo <gch981213@...il.com>,
        liaoweixiong <liaoweixiong@...winnertech.com>
Subject: RE: [EXT] Re: [PATCH 1/8] mtd: nand: move ONFI related functions to
 onfi.h

Hi Miquel,

Thanks for reviewing.

> 
> Hi Shiva,
> 
> shiva.linuxworks@...il.com wrote on Mon, 22 Jul 2019 07:56:14 +0200:
> 
> > From: Shivamurthy Shastri <sshivamurthy@...ron.com>
> >
> > These functions will be used by both raw NAND and SPI NAND, which
> > supports ONFI like standards.
> 
> This is not exactly what you do. Why not:
> 
> mtd: nand: export ONFI related functions to onfi.h
> 
> These functions can be used by all flavors of NAND chips (raw, SPI)
> which may all follow ONFI standards. Export the related functions in
> the onfi.h generic file.
> 

Looks good. I will use this.

> >
> > Signed-off-by: Shivamurthy Shastri <sshivamurthy@...ron.com>
> > ---
> >  drivers/mtd/nand/raw/internals.h | 1 -
> >  include/linux/mtd/onfi.h         | 9 +++++++++
> >  2 files changed, 9 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/mtd/nand/raw/internals.h
> b/drivers/mtd/nand/raw/internals.h
> > index cba6fe7dd8c4..ed323087d884 100644
> > --- a/drivers/mtd/nand/raw/internals.h
> > +++ b/drivers/mtd/nand/raw/internals.h
> > @@ -140,7 +140,6 @@ void nand_legacy_adjust_cmdfunc(struct
> nand_chip *chip);
> >  int nand_legacy_check_hooks(struct nand_chip *chip);
> >
> >  /* ONFI functions */
> > -u16 onfi_crc16(u16 crc, u8 const *p, size_t len);
> >  int nand_onfi_detect(struct nand_chip *chip);
> >
> >  /* JEDEC functions */
> > diff --git a/include/linux/mtd/onfi.h b/include/linux/mtd/onfi.h
> > index 339ac798568e..2c8a05a02bb0 100644
> > --- a/include/linux/mtd/onfi.h
> > +++ b/include/linux/mtd/onfi.h
> > @@ -10,6 +10,7 @@
> >  #ifndef __LINUX_MTD_ONFI_H
> >  #define __LINUX_MTD_ONFI_H
> >
> > +#include <linux/mtd/nand.h>
> 
> This should be removed, or at least not added at this moment.
> 

okay.

> >  #include <linux/types.h>
> >
> >  /* ONFI version bits */
> > @@ -175,4 +176,12 @@ struct onfi_params {
> >  	u8 vendor[88];
> >  };
> >
> > +/* ONFI functions */
> > +u16 onfi_crc16(u16 crc, u8 const *p, size_t len);
> > +void nand_bit_wise_majority(const void **srcbufs,
> > +			    unsigned int nsrcbufs,
> > +			    void *dstbuf,
> > +			    unsigned int bufsize);
> 
> Don't export this function while you don't use it from elsewhere.
> 

The function will be moved to nand/onfi.c in next patch and will be
used by both raw and SPI NAND.

> > +void sanitize_string(u8 *s, size_t len);
> 
> This one is used by jedec code and has no onfi-related logic, so you
> may want to export it (only when you will use it) in another header
> like linux/mtd/nand.h

okay, I will keep this as it is.

> 
> > +
> >  #endif /* __LINUX_MTD_ONFI_H */
> 
> Thanks,
> Miquèl

Thanks,
Shiva