linux-kernel - Re: [PATCH 6/6] da8xx: enable the use of the ICPFUNC in i2c-davinci

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Date:	Wed, 13 Apr 2011 19:04:34 -0400
From:	Mike Williamson <michael.williamson@...ticallink.com>
To:	"Nori, Sekhar" <nsekhar@...com>
Cc:	Ben Gardiner <bengardiner@...ometrics.ca>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	Ben Dooks <ben-linux@...ff.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bastian Ruppert <Bastian.Ruppert@...erin.de>,
	Philby John <pjohn@...mvista.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 6/6] da8xx: enable the use of the ICPFUNC in i2c-davinci

On Wed, Apr 13, 2011 at 11:10 AM, Nori, Sekhar <nsekhar@...com> wrote:
>
> Hi Ben,
>
> On Wed, Apr 06, 2011 at 03:08:09, Ben Gardiner wrote:
> > Both the da850 and da830 have an I2C controller which has the ICPFUNC
> > registers. Indicate this for all da830 and da850 boards by setting the
> > has_pfunc flag true in the da8xx utility setup routine for registering the
> > I2C controller
> >
> > Signed-off-by: Ben Gardiner <bengardiner@...ometrics.ca>
> > Cc: Sekhar Nori <nsekhar@...com>
> > Cc: Ben Dooks <ben-linux@...ff.org>
> >
> > ---
> >  arch/arm/mach-davinci/devices-da8xx.c |    6 ++++++
> >  1 files changed, 6 insertions(+), 0 deletions(-)
> >
> > diff --git a/arch/arm/mach-davinci/devices-da8xx.c b/arch/arm/mach-davinci/devices-da8xx.c
> > index beda8a4..da01558 100644
> > --- a/arch/arm/mach-davinci/devices-da8xx.c
> > +++ b/arch/arm/mach-davinci/devices-da8xx.c
> > @@ -324,6 +324,12 @@ int __init da8xx_register_i2c(int instance,
> >       else
> >               return -EINVAL;
> >
> > +     /*
> > +      * Both the DA850 and DA830 have an I2C controller which has the
> > +      * ICPFUNC et. al. registers
> > +      */
> > +     pdata->has_pfunc = 1;
>
> The I2C driver implements a default platform data
> so it should actually be legal for a DA8x board to
> pass NULL platform data. In that case this line
> will crash. You should either check for pdata to
> be NULL or just let each board choose whether it
> needs recovery (I think the better option).
>

I actually had a problem with using NULL for pdata with davinci I2C
and had submitted a patch here that sort of fell on the floor.  The
problem was that the i2c_davinci_calc_clk_dividers is using
platform_data without a check as described above.  So at the moment
using NULL doesn't really work, best as I can tell...

https://lkml.org/lkml/2010/9/4/119

FWIW.

-Mike
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