diff options
author | Baolin Wang <baolin.wang@spreadtrum.com> | 2017-10-24 08:47:49 +0300 |
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committer | Vinod Koul <vinod.koul@intel.com> | 2017-10-24 17:37:49 +0300 |
commit | ea09ec8c444c61446fb71952c6c50c8f7e8a8731 (patch) | |
tree | 2e544fd6acf4580195df6d575fb7757e0fecd357 /Documentation/devicetree/bindings/dma/sprd-dma.txt | |
parent | 2bd6bf03f4c1c59381d62c61d03f6cc3fe71f66e (diff) | |
download | linux-ea09ec8c444c61446fb71952c6c50c8f7e8a8731.tar.xz |
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 <baolin.wang@spreadtrum.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'Documentation/devicetree/bindings/dma/sprd-dma.txt')
-rw-r--r-- | Documentation/devicetree/bindings/dma/sprd-dma.txt | 41 |
1 files changed, 41 insertions, 0 deletions
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 = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>; + #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>; + ... +}; |