dt-bindings: dma: Add SpacemiT K1 PDMA controller

Add device tree binding documentation for the SpacemiT K1 PDMA
controller.

Signed-off-by: Guodong Xu <guodong@riscstar.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250822-working_dma_0701_v2-v5-1-f5c0eda734cc@riscstar.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/dma/spacemit,k1-pdma.yaml

@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/spacemit,k1-pdma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SpacemiT K1 PDMA Controller
+
+maintainers:
+  - Guodong Xu <guodong@riscstar.com>
+
+allOf:
+  - $ref: dma-controller.yaml#
+
+properties:
+  compatible:
+    const: spacemit,k1-pdma
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    description: Shared interrupt for all DMA channels
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  dma-channels:
+    maximum: 16
+
+  '#dma-cells':
+    const: 1
+    description:
+      The DMA request number for the peripheral device.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - resets
+  - dma-channels
+  - '#dma-cells'
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/spacemit,k1-syscon.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        dma-controller@d4000000 {
+            compatible = "spacemit,k1-pdma";
+            reg = <0x0 0xd4000000 0x0 0x4000>;
+            interrupts = <72>;
+            clocks = <&syscon_apmu CLK_DMA>;
+            resets = <&syscon_apmu RESET_DMA>;
+            dma-channels = <16>;
+            #dma-cells = <1>;
+        };
+    };