[PATCH v6 2/2] dt-bindings: dma: HiSilicon: Add bindings for HiSilicon Ascend sdma

[Guo Mengqi <guomengqi3@huawei.com>]

Add device-tree binding documentation for sdma hardware on
HiSilicon Ascend SoC families.

Signed-off-by: Guo Mengqi <guomengqi3@huawei.com>
---
 .../bindings/dma/hisilicon,ascend-sdma.yaml   | 73 +++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/hisilicon,ascend-sdma.yaml

diff --git a/Documentation/devicetree/bindings/dma/hisilicon,ascend-sdma.yaml b/Documentation/devicetree/bindings/dma/hisilicon,ascend-sdma.yaml
new file mode 100644
index 000000000000..7b452b54fe0c
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/hisilicon,ascend-sdma.yaml
@@ -0,0 +1,73 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/hisilicon,ascend-sdma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: HiSilicon Ascend System DMA (SDMA) controller
+
+description: |
+  The Ascend SDMA controller is used for transferring data
+  in system memory.
+
+maintainers:
+  - Guo Mengqi <guomengqi3@huawei.com>
+
+allOf:
+  - $ref: dma-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - hisilicon,ascend310-sdma
+      - hisilicon,ascend910-sdma
+
+  reg:
+    maxItems: 1
+
+  '#dma-cells':
+    const: 1
+    description:
+      Clients specify a single cell with channel number.
+
+  dma-channel-mask:
+    minItems: 1
+    maxItems: 2
+
+  iommus:
+    maxItems: 1
+
+  pasid-num-bits:
+    description: |
+      This tells smmu that this device supports iommu-sva feature.
+      This determines the maximum number of digits in the pasid.
+    maximum: 0x10
+
+  dma-coherent: true
+
+  dma-can-stall: true
+
+required:
+  - compatible
+  - reg
+  - dma-channel-mask
+  - '#dma-cells'
+  - iommus
+  - pasid-num-bits
+
+additionalProperties: false
+
+examples:
+  - |
+    dma-controller@880e0000 {
+        compatible = "hisilicon,ascend310-sdma";
+        reg = <0x880e0000 0x10000>;
+        dma-channel-mask = <0xff00>;
+        iommus = <&smmu 0x7f46>;
+        pasid-num-bits = <0x10>;
+        dma-coherent;
+        dma-can-stall;
+        #dma-cells = <1>;
+    };
+
+...
-- 
2.17.1