This patch adds documentation for the ZTE ZX296702 SoC DMA device
DTS binding.
Signed-off-by: Jun Nie <jun.nie@xxxxxxxxxx>
---
Documentation/devicetree/bindings/dma/zxdma.txt | 38 +++++++++++++++++++++++++
1 file changed, 38 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/zxdma.txt
diff --git a/Documentation/devicetree/bindings/dma/zxdma.txt b/Documentation/devicetree/bindings/dma/zxdma.txt
new file mode 100644
index 0000000..3207ceb
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/zxdma.txt
@@ -0,0 +1,38 @@
+* ZTE ZX296702 DMA controller
+
+Required properties:
+- compatible: Should be "zte,zx296702-dma"
+- reg: Should contain DMA registers location and length.
+- interrupts: Should contain one interrupt shared by all channel
+- #dma-cells: see dma.txt, should be 1, para number
+- dma-channels: physical channels supported
+- dma-requests: virtual channels supported, each virtual channel
+ have specific request line
+- clocks: clock required
+
+Example:
+
+Controller:
+ dma: dma-controller@0x09c00000{
+ compatible = "zte,zx296702-dma";
+ reg = <0x09c00000 0x1000>;
+ clocks = <&topclk ZX296702_DMA_ACLK>;
+ interrupts = <GIC_SPI 66 IRQ_TYPE_LEVEL_HIGH>;
+ #dma-cells = <1>;
+ dma-channels = <24>;
+ dma-requests = <24>;
+ };
+
+Client:
+Use specific request line passing from dmax
+For example, spdif0 tx channel request line is 4
+ spdif0: spdif0@0b004000 {
+ #sound-dai-cells = <0>;
+ compatible = "zte,zx296702-spdif";
+ reg = <0x0b004000 0x1000>;
+ clocks = <&lsp0clk ZX296702_SPDIF0_DIV>;
+ clock-names = "tx";
+ interrupts = <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
+ dmas = <&dma 4>;
+ dma-names = "tx";
+ }
--
1.9.1
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