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authorMark Brown <broonie@opensource.wolfsonmicro.com>2012-07-05 15:19:19 +0400
committerGrant Likely <grant.likely@secretlab.ca>2012-07-11 17:59:17 +0400
commit781d0f46d81e2c26c70649903b503bcfe817efc8 (patch)
tree11794b64c41e8468db6d14243c5becce3b5b64c8 /include/linux/irqdomain.h
parentaed98048bd1c83469d96932c1901e867d9ba519a (diff)
downloadlinux-781d0f46d81e2c26c70649903b503bcfe817efc8.tar.xz
irq_domain: Standardise legacy/linear domain selection
A large proportion of interrupt controllers that support legacy mappings do so because non-DT systems need to use fixed IRQ numbers when registering devices via buses but can otherwise use a linear mapping. The interrupt controller itself typically is not affected by the mapping used and best practice is to use a linear mapping where possible so drivers frequently select at runtime depending on if a legacy range has been allocated to them. Standardise this behaviour by providing irq_domain_register_simple() which will allocate a linear mapping unless a positive first_irq is provided in which case it will fall back to a legacy mapping. This helps make best practice for irq_domain adoption clearer. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'include/linux/irqdomain.h')
-rw-r--r--include/linux/irqdomain.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 5abb533eb8eb..17b60be30fff 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -112,6 +112,11 @@ struct irq_domain {
};
#ifdef CONFIG_IRQ_DOMAIN
+struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
+ unsigned int size,
+ unsigned int first_irq,
+ const struct irq_domain_ops *ops,
+ void *host_data);
struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
unsigned int size,
unsigned int first_irq,