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dt/irq: add irq_domain_generate_simple() helper

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irq_domain_generate_simple() is an easy way to generate an irq translation
domain for simple irq controllers.  It assumes a flat 1:1 mapping from
hardware irq number to an offset of the first linux irq number assigned
to the controller

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Grant Likely
2011-07-26 03:19:06 -06:00
parent 08a543ad33
commit 7e71330169
2 changed files with 68 additions and 0 deletions
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include/linux/irqdomain.h
+10
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@@ -16,6 +16,7 @@
#define _LINUX_IRQDOMAIN_H
#include <linux/irq.h>
#include <linux/mod_devicetable.h>
#ifdef CONFIG_IRQ_DOMAIN
struct device_node;
@@ -78,4 +79,13 @@ extern void irq_domain_add(struct irq_domain *domain);
extern void irq_domain_del(struct irq_domain *domain);
#endif /* CONFIG_IRQ_DOMAIN */
#if defined(CONFIG_IRQ_DOMAIN) && defined(CONFIG_OF_IRQ)
extern void irq_domain_add_simple(struct device_node *controller, int irq_base);
extern void irq_domain_generate_simple(const struct of_device_id *match,
u64 phys_base, unsigned int irq_start);
#else /* CONFIG_IRQ_DOMAIN && CONFIG_OF_IRQ */
static inline void irq_domain_generate_simple(const struct of_device_id *match,
u64 phys_base, unsigned int irq_start) { }
#endif /* CONFIG_IRQ_DOMAIN && CONFIG_OF_IRQ */
#endif /* _LINUX_IRQDOMAIN_H */