[    0.052512] dma: of_match_device fail
[    0.052551] sunxi_dmac 1c02000.dma: dma: reg ok now
[    0.052566] dma: reg ok now
[    0.052580] dma: res_start 1c02000
[    0.052591] dma: res_end 1c02fff
[    0.052632] dma: irq 22
[    0.053674] dma: of_match_device ok
[    0.053702] sunxi_dmac sunxi_dmac: unable to find 'reg' property
[    0.053717] dma: unable to find 'reg' property -22
[    0.053741] sunxi_dmac: probe of sunxi_dmac failed with error -22