dt-bindings: phytium-ddma: Add bindings for Phytium DDMA

This patch document provide DT bindings for the Phytium DDMA controller.

Signed-off-by: Li Guohui <[email protected]>
Signed-off-by: Liu Tianyu <[email protected]>
Signed-off-by: Li Mingzhe <[email protected]>
Signed-off-by: Wang Yinfeng <[email protected]>
Signed-off-by: Lan Hengyu <[email protected]>

Documentation/devicetree/bindings/dma/phytium-ddma.yaml

@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+title: Phytium DDMA Controller bindings
+
+description:
+The Phytium DDMA is a general-purpose direct memory access
+controller capable of supporting 8 independent DMA channels.
+Each channel can have up to 32 requests.DMA clients connected
+to the Phytium DDMA controller must use the format described
+in the dma.txt file, using a two-cell specifier for each
+channel:
+  a phandle to the DMA controller plus the following two integer cells:
+    1. The channel id
+    2. The request line number
+
+maintainers:
+  - Huang Jie <[email protected]>
+
+allOf:
+  - $ref: "dma-controller.yaml#"
+
+properties:
+  "#dma-cells":
+    const: 2
+
+  compatible:
+    const: phytium,ddma
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  dma-channels:
+    minItems: 1
+    maxItems: 8
+    description: it indicates that the number of channels are used
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - dma-channels
+
+unevaluatedProperties: false
+
+examples:
+    ddma0: ddma@28003000 {
+        compatible = "phytium,ddma";
+        reg = <0x0 0x28003000 0x0 0x1000>;
+        interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>;
+        #dma-cells = <2>;
+        dma-channels = <8>;
+    };
+...