linux-kernel - Re: [PATCH v2] gpio: interrupt consistency check for OF GPIO IRQs

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Date:	Mon, 26 Aug 2013 16:04:55 +0200
From:	Lars Poeschel <poeschel@...onage.de>
To:	Andreas Larsson <andreas@...sler.com>
Cc:	Lars Poeschel <larsi@....tu-dresden.de>, grant.likely@...aro.org,
	linus.walleij@...aro.org, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	mark.rutland@....com, ian.campbell@...rix.com,
	galak@...eaurora.org, pawel.moll@....com, tomasz.figa@...il.com,
	swarren@...dotorg.org,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Enric Balletbo i Serra <eballetbo@...il.com>,
	"Jean-Christophe PLAGNIOL-VILLARD" <plagnioj@...osoft.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Kevin Hilman <khilman@...aro.org>,
	Balaji T K <balajitk@...com>,
	Tony Lindgren <tony@...mide.com>,
	Jon Hunter <jgchunter@...il.com>
Subject: Re: [PATCH v2] gpio: interrupt consistency check for OF GPIO IRQs

On Monday 26 August 2013 at 13:29:07, Andreas Larsson wrote:
> On 2013-08-26 12:56, Lars Poeschel wrote:
> > Hi Andreas!
> > 
> > On Thursday 22 August 2013 at 15:16:18, Andreas Larsson wrote:
> >> On 2013-08-21 15:38, Lars Poeschel wrote:
> >>> +static void of_gpio_scan_irq_lines(const struct device_node *const
> >>> node, +				   struct device_node *const gcn,
> >>> +				   struct irq_domain *const irq_domain,
> >>> +				   const u32 intsize,
> >>> +				   const struct gpio_chip * const gc,
> >>> +				   bool request)
> >>> +{
> >>> +	struct device_node *child;
> >>> +	struct device_node *irq_parent;
> >>> +	const __be32 *intspec;
> >>> +	u32 intlen;
> >>> +	int ret;
> >>> +	int i;
> >>> +	irq_hw_number_t hwirq;
> >>> +	unsigned int type;
> >>> +
> >>> +	if (node == NULL)
> >>> +		return;
> >>> +
> >>> +	for_each_child_of_node(node, child) {
> >>> +		of_gpio_scan_irq_lines(child, gcn, irq_domain, intsize, gc,
> >>> +				       request);
> >>> +		/* Check if we have an IRQ parent, else continue */
> >>> +		irq_parent = of_irq_find_parent(child);
> >> 
> >> Hi!
> >> 
> >> This call to of_irq_find_parent breaks gpiolib-of for SPARC due to
> >> the fact that the function is undefined when !defined(CONFIG_OF_IRQ)
> >> && defined(CONFIG_OF).
> >> 
> >> Defining the empty of_irq_find_parent in include/linux/of_irq.h when
> >> !defined(CONFIG_OF_IRQ) instead of the current case when
> >> !defined(CONFIG_OF) would solve the immediate compilation problem.
> > 
> > Is this a bug and should be fixed ?
> 
> Well, at least as soon as anyone tries to use in a context that does not
> exclude SPARC it creates a bug, so I would say so. There is no reason
> for SPARC to fall between the chairs. This is the first case I am aware
> of that triggers this.

I also think this should be fixed.
Are you able to do a patch that fixes this and submit to the relevant 
people?

Regards,
Lars
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