关于GPIO实例结构中的IsDual是什么？

/**
* The XGpio driver instance data. The user is required to allocate a
* variable of this type for every GPIO device in the system. A pointer
* to a variable of this type is then passed to the driver API functions.
*/
typedef struct {
        UINTPTR BaseAddress;        /* Device base address */
        u32 IsReady;                /* Device is initialized and ready */
        int InterruptPresent;        /* Are interrupts supported in h/w */
        int IsDual;                /* Are 2 channels supported in h/w */
} XGpio;请问这个IsDual是什么呢？是指的该IO是输入输出双向的吗？

额.........抱歉，我又看了看框图，是GPIO使能了一个通道，没有使能GPIO2

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