linux-kernel - Re: [PATCH v4 4/4] gpio: pl061: enable interrupts with DT style binding

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Message-ID: <4F34429E.8070605@gmail.com>
Date:	Thu, 09 Feb 2012 16:03:10 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Shawn Guo <shawn.guo@...aro.org>
CC:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Thomas Gleixner <tglx@...utronix.de>, b-cousson@...com,
	Linus Walleij <linus.ml.walleij@...il.com>
Subject: Re: [PATCH v4 4/4] gpio: pl061: enable interrupts with DT style binding


On 02/09/2012 02:04 PM, Shawn Guo wrote:
> On Fri, Feb 03, 2012 at 04:35:12PM -0600, Rob Herring wrote:
> ...
>> @@ -126,18 +127,16 @@ static void pl061_set_value(struct gpio_chip *gc, unsigned offset, int value)
>>  static int pl061_to_irq(struct gpio_chip *gc, unsigned offset)
>>  {
>>  	struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
>> -
>> -	if (chip->irq_base <= 0)
>> -		return -EINVAL;
>> -
>> -	return chip->irq_base + offset;
>> +	if (!chip->irq_gc)
>> +		return -ENXIO;
>> +	return irq_find_mapping(chip->irq_gc->domain, offset);
> 
> If I understand the driver correctly, it will add a linear domain for
> dt case.  Do you have code somewhere creating the mapping before this
> irq_find_mapping gets called here?  The reason I'm asking this is I
> have to call irq_create_mapping rather than irq_find_mapping here to
> get imx gpio driver working with linear domain, otherwise the
> irq_find_mapping call will fail.
> 

Right, the user has to call irq_of_parse_and_map (which calls
irq_create_mapping ultimately). Interrupts are allocated on demand. The
dts needs to declare the gpio controller as an interrupt-controller and
the node using the gpio line needs to set its interrupt parent and
interrupt connection

Rob

> Regards,
> Shawn
> 
>>  }
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