之前没搞过spi,现在的项目中要把spi配置成slave模式,但是我现在用的内核是3.20的,都是配置spi为master的,有人知道怎么配置为slave吗,之前看到别人说把master改为slave,把输出改为输入,我还是不懂,有搞过这个的吗,说详细点
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