dt/irq: add irq_domain_generate_simple() helper

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>
2 files changed