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From: Marek Vasut <marex@denx.de>
To: Huang Shijie <b32955@freescale.com>
Subject: Re: [PATCH] nand: gpmi-nand: Fix clock registration
Date: Mon, 8 Oct 2012 05:37:04 +0200
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Cc: Fabio Estevam <fabio.estevam@freescale.com>,
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Dear Huang Shijie,

> =E4=BA=8E 2012=E5=B9=B410=E6=9C=8808=E6=97=A5 11:15, Marek Vasut =E5=86=
=99=E9=81=93:
> > Dear Huang Shijie,
> >=20
> >> =E4=BA=8E 2012=E5=B9=B409=E6=9C=8824=E6=97=A5 02:31, Fabio Estevam =E5=
=86=99=E9=81=93:
> >>> From: Fabio Estevam <fabio.estevam@freescale.com>
> >>>=20
> >>> On a mx28 board the following error happens since commit 638064e56c
> >>> (mtd: gpmi: change the code for clocks):
> >>>=20
> >>> gpmi-nand: probe of 8000c000.gpmi-nand failed with error -12
> >>>=20
> >>> Acquire the clock using "NULL" as it was done previously, so that the
> >>> driver can register on mx23/mx28 as well.
> >>>=20
> >>> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
> >>> ---
> >>>=20
> >>>  drivers/mtd/nand/gpmi-nand/gpmi-nand.c |    2 +-
> >>>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>>=20
> >>> diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> >>> b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c index c46be6c..1f23cb4 100644
> >>> --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> >>> +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> >>> @@ -492,7 +492,7 @@ static int __devinit gpmi_get_clks(struct
> >>> gpmi_nand_data *this)
> >>>=20
> >>>  	int i;
> >>>  =09
> >>>  	/* The main clock is stored in the first. */
> >>>=20
> >>> -	r->clock[0] =3D clk_get(this->dev, "gpmi_io");
> >>> +	r->clock[0] =3D clk_get(this->dev, NULL);
> >>=20
> >> Please do not change this line.
> >>=20
> >> The gpmi_io is for mx6q.
> >> If you replace it with `NULL`. The mx6q can not find the proper clock.
> >=20
> > Suggestion is really welcome though, please :) This is a problem, GPMI
> > NAND is broken on anything !=3D mx6q. Huang, can you please also test t=
he
> > changes you do to GPMI NAND on mx28/mx23 so we can avoid this breakage
> > in the future?
>=20
> yes. I tested in the mx23/mx28. It's ok, do not worry.

I won't be posting here that it's broken in the first place if it was ok ;-)

Give it one more go with latest -next ...

Best regards,
Marek Vasut