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pcf857x chip has some pins, but interrupt pin is only 1 pin. And gpiolib requests 1 interrupt per 1 gpio pin. Thus, this patch added demuxed irq to pcf857x driver, and enabled gpio_to_irq(). Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>