port_f_idx 145 drivers/gpio/gpio-ep93xx.c int port_f_idx = ((irq + 1) & 7) ^ 4; /* {19..22,47..50} -> {0..7} */ port_f_idx 146 drivers/gpio/gpio-ep93xx.c int gpio_irq = EP93XX_GPIO_F_IRQ_BASE + port_f_idx;