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

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Message-ID: <52160F22.2080701@gaisler.com>
Date:	Thu, 22 Aug 2013 15:16:18 +0200
From:	Andreas Larsson <andreas@...sler.com>
To:	Lars Poeschel <larsi@....tu-dresden.de>
CC:	poeschel@...onage.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 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.

However, when !defined(CONFIG_OF_IRQ) (i.e. SPARC in this case) the 
whole tree walking will never accomplish anything, so it would be good 
if of_gpiochip_reserve_irq_lines is just an empty dummy or something 
like that when !defined(CONFIG_OF_IRQ).

Cheers,
Andreas Larsson

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