58 lines · plain
1* IMG Multi-threaded DMA Controller (MDC)2 3Required properties:4- compatible: Must be "img,pistachio-mdc-dma".5- reg: Must contain the base address and length of the MDC registers.6- interrupts: Must contain all the per-channel DMA interrupts.7- clocks: Must contain an entry for each entry in clock-names.8 See ../clock/clock-bindings.txt for details.9- clock-names: Must include the following entries:10 - sys: MDC system interface clock.11- img,cr-periph: Must contain a phandle to the peripheral control syscon12 node which contains the DMA request to channel mapping registers.13- img,max-burst-multiplier: Must be the maximum supported burst size multiplier.14 The maximum burst size is this value multiplied by the hardware-reported bus15 width.16- #dma-cells: Must be 3:17 - The first cell is the peripheral's DMA request line.18 - The second cell is a bitmap specifying to which channels the DMA request19 line may be mapped (i.e. bit N set indicates channel N is usable).20 - The third cell is the thread ID to be used by the channel.21 22Optional properties:23- dma-channels: Number of supported DMA channels, up to 32. If not specified24 the number reported by the hardware is used.25 26Example:27 28mdc: dma-controller@18143000 {29 compatible = "img,pistachio-mdc-dma";30 reg = <0x18143000 0x1000>;31 interrupts = <GIC_SHARED 27 IRQ_TYPE_LEVEL_HIGH>,32 <GIC_SHARED 28 IRQ_TYPE_LEVEL_HIGH>,33 <GIC_SHARED 29 IRQ_TYPE_LEVEL_HIGH>,34 <GIC_SHARED 30 IRQ_TYPE_LEVEL_HIGH>,35 <GIC_SHARED 31 IRQ_TYPE_LEVEL_HIGH>,36 <GIC_SHARED 32 IRQ_TYPE_LEVEL_HIGH>,37 <GIC_SHARED 33 IRQ_TYPE_LEVEL_HIGH>,38 <GIC_SHARED 34 IRQ_TYPE_LEVEL_HIGH>,39 <GIC_SHARED 35 IRQ_TYPE_LEVEL_HIGH>,40 <GIC_SHARED 36 IRQ_TYPE_LEVEL_HIGH>,41 <GIC_SHARED 37 IRQ_TYPE_LEVEL_HIGH>,42 <GIC_SHARED 38 IRQ_TYPE_LEVEL_HIGH>;43 clocks = <&system_clk>;44 clock-names = "sys";45 46 img,max-burst-multiplier = <16>;47 img,cr-periph = <&cr_periph>;48 49 #dma-cells = <3>;50};51 52spi@18100f00 {53 ...54 dmas = <&mdc 9 0xffffffff 0>, <&mdc 10 0xffffffff 0>;55 dma-names = "tx", "rx";56 ...57};58