Documentation: Update IRQ-domain.txt to document irq_domain_mapping
irq_domain_mapping is a rather useful tool to understand how IRqs are mapped in irqdomains, and yet it is not documented anywhere. Let's address this. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Link: http://lkml.kernel.org/r/20170512115538.10767-5-marc.zyngier@arm.comSigned-off-by: Thomas Gleixner <tglx@linutronix.de>
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