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 21:12:05 +0530
From:	"Nori, Sekhar" <nsekhar@...com>
To:	Ben Gardiner <bengardiner@...ometrics.ca>
CC:	"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-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bastian Ruppert <Bastian.Ruppert@...erin.de>,
	"Griffis, Brad" <bgriffis@...com>,
	Jon Povey <jon.povey@...elogic.co.uk>,
	Philby John <pjohn@...mvista.com>
Subject: RE: [PATCH 6/6] da8xx: enable the use of the ICPFUNC in i2c-davinci

On Wed, Apr 13, 2011 at 20:52:05, Ben Gardiner wrote:

> >> --- 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.
> 
> Good catch, thanks.
> 
> > [...] 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 understand "check for pdata to be NULL."  If you think it is the
> better option I'd be happy to implement it but I don't understand how
> to implement "let each board choose whether it needs recovery."

This is done by just setting has_pfunc = 1 in the
davinci_i2c_platform_data defined in the board file.

Thanks,
Sekhar

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