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irqdomain: document the simple domain first_irq 

The first_irq needs to be zero to get a linear domain and that
comes with special semantics. We want to simplify this going
forward but some documentation never hurts.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
Linus Walleij 2013-06-06 12:10:23 +01:00 committed by Grant Likely
parent 275e31b10c
commit 94a63da0ac
1 changed files with 4 additions and 1 deletions
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kernel/irq/irqdomain.c
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@ -143,7 +143,10 @@ static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain,
* irq_domain_add_simple() - Allocate and register a simple irq_domain.
* @of_node: pointer to interrupt controller's device tree node.
* @size: total number of irqs in mapping
* @first_irq: first number of irq block assigned to the domain
* @first_irq: first number of irq block assigned to the domain,
* pass zero to assign irqs on-the-fly. This will result in a
* linear IRQ domain so it is important to use irq_create_mapping()
* for each used IRQ, especially when SPARSE_IRQ is enabled.
* @ops: map/unmap domain callbacks
* @host_data: Controller private data pointer
*