system and will otherwise use a linear domain mapping. The semantics
of this call are such that if an IRQ range is specified then
descriptors will be allocated on-the-fly for it, and if no range is
-specified it will fall through to irq_domain_add_linear() which meand
+specified it will fall through to irq_domain_add_linear() which means
*no* irq descriptors will be allocated.
A typical use case for simple domains is where an irqchip provider