linux-kernel - Re: [PATCH] MFD: twl-core: Fix chip ID for the twl6030-pwm module

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Date:	Mon, 12 Nov 2012 15:50:36 +0100
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	<t-kristo@...com>
CC:	Samuel Ortiz <sameo@...ux.intel.com>,
	<linux-kernel@...r.kernel.org>,
	Thierry Reding <thierry.reding@...onic-design.de>
Subject: Re: [PATCH] MFD: twl-core: Fix chip ID for the twl6030-pwm module

Hi Samuel,

On 11/01/2012 10:09 AM, Tero Kristo wrote:
> Acked-by: Tero Kristo <t-kristo@...com>

Can you take this patch for 3.7?

Thank you,
Péter

> 
> On Wed, 2012-10-31 at 15:54 +0100, Peter Ujfalusi wrote:
>> The correct chip id is 1 since the PWM module is on address 0x49. With the
>> current TWL6030_MODULE_ID1 the kernel will crash early since:
>> #define TWL6030_MODULE_ID1 0x0E
>> and
>> static struct twl_client twl_modules[4];
>>
>> Down in the stack we try to get the module by:
>> struct twl_client	*twl = &twl_modules[chip];
>>
>> Which obviously going to do nasty things.
>>
>> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
>> ---
>> Hi Samuel,
>>
>> Can you push this patch to 3.7?
>> Without this if the user enables the twl6030-pwm driver the kernel will not
>> going to boot on OMAP4.
>>
>> Thank you,
>> Peter
>>
>>  drivers/mfd/twl-core.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
>> index 2624668..d7577cb 100644
>> --- a/drivers/mfd/twl-core.c
>> +++ b/drivers/mfd/twl-core.c
>> @@ -672,7 +672,7 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
>>  	}
>>  
>>  	if (IS_ENABLED(CONFIG_PWM_TWL6030) && twl_class_is_6030()) {
>> -		child = add_child(TWL6030_MODULE_ID1, "twl6030-pwm", NULL, 0,
>> +		child = add_child(SUB_CHIP_ID1, "twl6030-pwm", NULL, 0,
>>  				  false, 0, 0);
>>  		if (IS_ERR(child))
>>  			return PTR_ERR(child);
> 
> 

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