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

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Message-ID: <20120210163743.GB2723@r65073-Latitude-D630>
Date:	Fri, 10 Feb 2012 08:37:44 -0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Rob Herring <robherring2@...il.com>
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 Thu, Feb 09, 2012 at 06:17:44PM -0600, Rob Herring wrote:
> On 02/09/2012 05:58 PM, Shawn Guo wrote:
> > On Thu, Feb 09, 2012 at 04:03:10PM -0600, Rob Herring wrote:
> >>
> >> 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
> >>
> > Yes, that's how dt users use irq.  But since I'm trying to make the
> > imx gpio irq_domain as linear for both non-dt and dt users.  Calling
> > irq_create_mapping here may make sense for me, since it will not
> > require all these non-dt users change the way they use gpio irq.
> > 
> 
> I wouldn't try to use linear for non-DT at this point.
> 
Sure, I'm not convincing you to do that but just explaining what I'm
doing here.

-- 
Regards,
Shawn
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