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authorManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>2018-07-26 10:36:55 +0530
committerVinod Koul <vkoul@kernel.org>2018-08-09 08:16:00 +0530
commit50454acaac63c4dea03a765242eb0d662a4fc383 (patch)
tree991726c655ce61398f8aa292f8dc1da7457527c2
parentce397d215ccd07b8ae3f71db689aedb85d56ab40 (diff)
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blackbird-obmc-linux-50454acaac63c4dea03a765242eb0d662a4fc383.zip
dt-bindings: dmaengine: Add binding for Actions Semi Owl SoCs
Add devicetree binding for Actions Semi Owl SoCs DMA controller. Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Vinod Koul <vkoul@kernel.org>
-rw-r--r--Documentation/devicetree/bindings/dma/owl-dma.txt47
1 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/owl-dma.txt b/Documentation/devicetree/bindings/dma/owl-dma.txt
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+++ b/Documentation/devicetree/bindings/dma/owl-dma.txt
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+* Actions Semi Owl SoCs DMA controller
+
+This binding follows the generic DMA bindings defined in dma.txt.
+
+Required properties:
+- compatible: Should be "actions,s900-dma".
+- reg: Should contain DMA registers location and length.
+- interrupts: Should contain 4 interrupts 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: Physical channels supported.
+- dma-requests: Number of DMA request signals supported by the controller.
+ Refer to Documentation/devicetree/bindings/dma/dma.txt
+- clocks: Phandle and Specifier of the clock feeding the DMA controller.
+
+Example:
+
+Controller:
+ dma: dma-controller@e0260000 {
+ compatible = "actions,s900-dma";
+ reg = <0x0 0xe0260000 0x0 0x1000>;
+ interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 58 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 59 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 60 IRQ_TYPE_LEVEL_HIGH>;
+ #dma-cells = <1>;
+ dma-channels = <12>;
+ dma-requests = <46>;
+ clocks = <&clock CLK_DMAC>;
+ };
+
+Client:
+
+DMA clients connected to the Actions Semi Owl SoCs 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.
+
+uart5: serial@e012a000 {
+ ...
+ dma-names = "tx", "rx";
+ dmas = <&dma 26>, <&dma 27>;
+ ...
+};
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