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TPS65987D: 读取Sink Capabilities(0x31)列表是空的

Part Number: TPS65987D


现在我需要读取例如手机或者笔记本的Sink Capabilities(0x31),但是只能读取出来Source Capabilities(0x30),Sink Capabilities列表是空的,有哪些需要注意的点?可以帮我看看吗,如果可以的话我可以将我的工程上传。