[U-Boot] [PATCH] mtd: zynq: nand: Move board_nand_init() function to board.c

[Wilson Lee <wilson.lee@ni.com>]

Hi Michal,

On Wed, 2017-11-08 at 08:54 +0100, Michal Simek wrote:
> On 8.11.2017 03:44, Wilson Lee wrote:
> > 
> > Putting board_nand_init() function inside NAND driver was not
> > appropriate
> > due to it doesn't allow board vendor to customise their NAND
> > initialization code such as adding NAND lock/unlock code.
> > 
> > This commit was to move the board_nand_init() function from NAND
> > driver
> > to board.c file. This allow customization of board_nand_init()
> > function.
> > 
> > Signed-off-by: Wilson Lee <wilson.lee@ni.com>
> > Cc: Joe Hershberger <joe.hershberger@ni.com>
> > Cc: Keng Soon Cheah <keng.soon.cheah@ni.com>
> > Cc: Chen Yee Chew <chen.yee.chew@ni.com>
> > Cc: Albert Aribaud <albert.u.boot@aribaud.net>
> > Cc: Michal Simek <michal.simek@xilinx.com>
> > Cc: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
> > Cc: Scott Wood <oss@buserror.net>
> > ---
> >  arch/arm/mach-zynq/include/mach/nand.h |  9 +++++++++
> >  board/xilinx/zynq/board.c              | 10 ++++++++++
> >  drivers/mtd/nand/zynq_nand.c           | 12 +-----------
> >  3 files changed, 20 insertions(+), 11 deletions(-)
> >  create mode 100644 arch/arm/mach-zynq/include/mach/nand.h
> > 
> > diff --git a/arch/arm/mach-zynq/include/mach/nand.h
> > b/arch/arm/mach-zynq/include/mach/nand.h
> > new file mode 100644
> > index 0000000..61ef45f
> > --- /dev/null
> > +++ b/arch/arm/mach-zynq/include/mach/nand.h
> > @@ -0,0 +1,9 @@
> > +/*
> > + * Copyright (C) 2017 National Instruments Corp.
> > + *
> > + * SPDX-License-Identifier:	GPL-2.0+
> > + */
> > +
> > +#include <nand.h>
> > +
> > +void zynq_nand_init(void);
> > diff --git a/board/xilinx/zynq/board.c b/board/xilinx/zynq/board.c
> > index 90ef542..8bcb830 100644
> > --- a/board/xilinx/zynq/board.c
> > +++ b/board/xilinx/zynq/board.c
> > @@ -9,6 +9,7 @@
> >  #include <fpga.h>
> >  #include <mmc.h>
> >  #include <zynqpl.h>
> > +#include <asm/arch/nand.h>
> >  #include <asm/arch/hardware.h>
> >  #include <asm/arch/sys_proto.h>
> >  
> > @@ -156,3 +157,12 @@ int dram_init(void)
> >  	return 0;
> >  }
> >  #endif
> > +
> > +static struct nand_chip nand_chip[CONFIG_SYS_MAX_NAND_DEVICE];
> > +void board_nand_init(void)
> > +{
> > +	struct nand_chip *nand = &nand_chip[0];
> > +
> > +	if (zynq_nand_init(nand, 0))
> > +		puts("ZYNQ NAND init failed\n");
> > +}
> This is probably not enough for platforms which don't enable NAND.
> 
> > 
> > diff --git a/drivers/mtd/nand/zynq_nand.c
> > b/drivers/mtd/nand/zynq_nand.c
> > index dec2c41..9be6856 100644
> > --- a/drivers/mtd/nand/zynq_nand.c
> > +++ b/drivers/mtd/nand/zynq_nand.c
> > @@ -1006,7 +1006,7 @@ static int zynq_nand_device_ready(struct
> > mtd_info *mtd)
> >  	return 0;
> >  }
> >  
> > -static int zynq_nand_init(struct nand_chip *nand_chip, int devnum)
> > +int zynq_nand_init(struct nand_chip *nand_chip, int devnum)
> >  {
> >  	struct zynq_nand_info *xnand;
> >  	struct mtd_info *mtd;
> > @@ -1191,13 +1191,3 @@ fail:
> >  	free(xnand);
> >  	return err;
> >  }
> > -
> > -static struct nand_chip nand_chip[CONFIG_SYS_MAX_NAND_DEVICE];
> > -
> > -void board_nand_init(void)
> > -{
> > -	struct nand_chip *nand = &nand_chip[0];
> > -
> > -	if (zynq_nand_init(nand, 0))
> > -		puts("ZYNQ NAND init failed\n");
> > -}
> > 
> What's the sequence which you want to add?

Actually we wish to perform a NAND unlock right after the NAND was
begin initialized. So that, we can do some write operation (ubifs table
R/W) when we mount it as ubifs.

> Isn't it better just to include this there or create a hook here?

I was thinking for adding a hook here before. But, it will be more make
sense to me if we correct the NAND driver by moving board_nand to
board.c file.

> 
> Definitely some platforms moved this to board file and not a problem
> with moving it because it shouldn't be in nand driver.
> 
> Thanks,
> Michal
> 

Thanks, Michal.

Best Regards,
Wilson Lee