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 11:22:05 -0400
From:	Ben Gardiner <bengardiner@...ometrics.ca>
To:	"Nori, Sekhar" <nsekhar@...com>
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

Hi Sekhar,

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.

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."

Best Regards,
Ben Gardiner

---
Nanometrics Inc.
http://www.nanometrics.ca
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