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After changing the drivers to use GPIO core to add an IRQ chip it appears that some of them requires a hardware initialization before adding the IRQ chip. Add an optional callback ->init_hw() to allow that drivers to initialize hardware if needed. This change is a part of the fix NULL pointer dereference brought to the several drivers recently. Cc: Hans de Goede <[email protected]> Signed-off-by: Andy Shevchenko <[email protected]> Signed-off-by: Linus Walleij <[email protected]>