linux-kernel - Re: [PATCH] reset: add reset_control

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Date:	Thu, 9 Oct 2014 08:17:44 -0500
From:	Dinh Nguyen <dinguyen@...nsource.altera.com>
To:	Philipp Zabel <p.zabel@...gutronix.de>
CC:	<dinh.linux@...il.com>, <atull@...nsource.altera.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] reset: add reset_control_status helper function

Hi Philipp,

On 10/9/14, 3:44 AM, Philipp Zabel wrote:
> Hi Dinh,
> 
> thank you for the patch. Just two small issues below:
> 
> Am Mittwoch, den 08.10.2014, 17:45 -0500 schrieb dinguyen@...nsource.altera.com:
> [...]
>> @@ -126,6 +126,19 @@ int reset_control_deassert(struct reset_control *rstc)
>>  EXPORT_SYMBOL_GPL(reset_control_deassert);
>>  
>>  /**
>> + * reset_control_status - returns a status of a reset bit
>> + * @rstc: reset controller
>> + */
>> +unsigned int reset_control_status(struct reset_control *rstc)
>> +{
>> +	if (rstc->rcdev->ops->status)
>> +		return rstc->rcdev->ops->status(rstc->rcdev, rstc->id);
>> +
>> +	return -ENOSYS;
>> +}
>> +EXPORT_SYMBOL_GPL(reset_control_status);
> 
> Since this function can return negative error numbers, please make the
> return value of reset_control_status int. That also means that drivers
> must not set the MSB when returning status.

Ah yes...Don't why I changed it to unsigned int for the return.

> 
>> +
>> +/**
>>   * of_reset_control_get - Lookup and obtain a reference to a reset controller.
>>   * @node: device to be reset by the controller
>>   * @id: reset line name
>> diff --git a/include/linux/reset-controller.h b/include/linux/reset-controller.h
>> index 41a4695..8e659d5 100644
>> --- a/include/linux/reset-controller.h
>> +++ b/include/linux/reset-controller.h
>> @@ -17,6 +17,7 @@ struct reset_control_ops {
>>  	int (*reset)(struct reset_controller_dev *rcdev, unsigned long id);
>>  	int (*assert)(struct reset_controller_dev *rcdev, unsigned long id);
>>  	int (*deassert)(struct reset_controller_dev *rcdev, unsigned long id);
>> +	unsigned int (*status)(struct reset_controller_dev *rcdev, unsigned long id);
>>  };
> 
> Please change the return value of the status callback to int and
> describe it in the kerneldoc comment above. It should probably be
> mentioned that the returned status value must be >= 0 except in error
> cases.
>  
Will do for V2...

Dinh
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