The subject is misleading. It's not fixing anything, just moving away from deprecated to "supported" APIs.
Quoting Lina Iyer (2019-08-29 11:11:58) > Replace gpiochip_irqchip_add() and gpiochip_set_chained_irqchip() calls > by populating the gpio_irq_chip data structures instead. > > Signed-off-by: Lina Iyer <il...@codeaurora.org>