CAPS_2
dma_read(CAPS_2, 0), dma_read(CAPS_3, 0),
[CAPS_2] = { 0x0456, 0x00, OMAP_DMA_REG_16BIT },
[CAPS_2] = { 0x006c, 0x00, OMAP_DMA_REG_32BIT },