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am3359ice的板子，想在arm-linux上驱动gpio，这些接口怎么调用啊，是怎样的格式啊，“err=”是什么意思，sample_name 应该填什么，需要哪些头文件，我自己瞎写的尽是错误，新手求指点。给跪了
我想驱动gpio，求大神给指点下设备树，驱动，硬件之间的关系，用户程序该调用啥，接口在哪，感谢，感谢
