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Split out dwapb_get_irq() helper for better readability and maintenance.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Serge Semin <fancer.lancer@gmail.com>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Link: https://lore.kernel.org/r/20200415141534.31240-13-andriy.shevchenko@linux.intel.com

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>