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能否给小弟提供一个DM6467的GPIO的例程，有点急
看一个gpio控制led灯的就明白了，每个平台都差不多，大概过程：
setup_pin_mux（）
omap_mux_init_gpio(gpio, OMAP_PIN_INPUT_PULLUP);
gpio_request();
irq_set_irq_type(OMAP_GPIO_IRQ(gpio),IRQ_TYPE_EDGE_FALLING);
enable_irq(gpio_to_irq(gpio));
gpio_direction_output(gpio, 1);
