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我使用gpio0_19来触发edma，申请的通道是22，可是当gpio0_19上升沿并没有触发edma，请问还需要配置什么吗
AM335x EDMA的驱动请参考：
http://processors.wiki.ti.com/index.php/AM335x_EDMA_Driver%27s_Guide
文档中需要配置的也都配置了，am33xx_dma_rsv_chans这个数组没有作修改，通道22，GPIO0作为event
触发方式？还有触发源都设置了吗？
GPIO0_19指定了吗？
