From ea09ec8c444c61446fb71952c6c50c8f7e8a8731 Mon Sep 17 00:00:00 2001 From: Baolin Wang Date: Tue, 24 Oct 2017 13:47:49 +0800 Subject: [PATCH] dt-bindings: dmaengine: Add Spreadtrum SC9860 DMA controller This patch adds the binding documentation for Spreadtrum SC9860 DMA controller device. Signed-off-by: Baolin Wang Acked-by: Rob Herring Signed-off-by: Vinod Koul --- Documentation/devicetree/bindings/dma/sprd-dma.txt | 41 ++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/sprd-dma.txt diff --git a/Documentation/devicetree/bindings/dma/sprd-dma.txt b/Documentation/devicetree/bindings/dma/sprd-dma.txt new file mode 100644 index 000000000000..7a10fea2e51b --- /dev/null +++ b/Documentation/devicetree/bindings/dma/sprd-dma.txt @@ -0,0 +1,41 @@ +* Spreadtrum DMA controller + +This binding follows the generic DMA bindings defined in dma.txt. + +Required properties: +- compatible: Should be "sprd,sc9860-dma". +- reg: Should contain DMA registers location and length. +- interrupts: Should contain one interrupt shared by all channel. +- #dma-cells: must be <1>. Used to represent the number of integer + cells in the dmas property of client device. +- #dma-channels : Number of DMA channels supported. Should be 32. +- clock-names: Should contain the clock of the DMA controller. +- clocks: Should contain a clock specifier for each entry in clock-names. + +Example: + +Controller: +apdma: dma-controller@20100000 { + compatible = "sprd,sc9860-dma"; + reg = <0x20100000 0x4000>; + interrupts = ; + #dma-cells = <1>; + #dma-channels = <32>; + clock-names = "enable"; + clocks = <&clk_ap_ahb_gates 5>; +}; + + +Client: +DMA clients connected to the Spreadtrum DMA controller must use the format +described in the dma.txt file, using a two-cell specifier for each channel. +The two cells in order are: +1. A phandle pointing to the DMA controller. +2. The channel id. + +spi0: spi@70a00000{ + ... + dma-names = "rx_chn", "tx_chn"; + dmas = <&apdma 11>, <&apdma 12>; + ... +}; -- 2.11.0