From: Xianwei Zhao <xianwei.zhao@amlogic.com>

Add documentation describing the Amlogic A9 SoC DMA.

Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
---
 .../devicetree/bindings/dma/amlogic,a9-dma.yaml    | 66 ++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/amlogic,a9-dma.yaml b/Documentation/devicetree/bindings/dma/amlogic,a9-dma.yaml
new file mode 100644
index 000000000000..3158d99a3195
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/amlogic,a9-dma.yaml
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/amlogic,a9-dma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Amlogic general DMA controller
+
+description:
+  This is a general-purpose peripheral DMA controller. It currently supports
+  major peripherals including I2C, I3C, PIO, and CAN-BUS. Transmit and receive
+  for the same peripheral use two separate channels, controlled by different
+  register sets. I2C and I3C transfer data in 1-byte units, while PIO and
+  CAN-BUS transfer data in 4-byte units. From the controller’s perspective,
+  there is no significant difference.
+
+maintainers:
+  - Xianwei Zhao <xianwei.zhao@amlogic.com>
+
+properties:
+  compatible:
+    const: amlogic,a9-dma
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: sys
+
+  '#dma-cells':
+    const: 2
+
+  dma-channels:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    maximum: 64
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - '#dma-cells'
+  - dma-channels
+
+allOf:
+  - $ref: dma-controller.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    dma-controller@fe400000{
+        compatible = "amlogic,a9-dma";
+        reg = <0xfe400000 0x4000>;
+        interrupts = <GIC_SPI 35 IRQ_TYPE_EDGE_RISING>;
+        clocks = <&clkc 45>;
+        #dma-cells = <2>;
+        dma-channels = <28>;
+    };

-- 
2.52.0

On Fri, Feb 06, 2026 at 09:02:32AM +0000, Xianwei Zhao wrote:
> Add documentation describing the Amlogic A9 SoC DMA.
>
> Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
> ---
>  .../devicetree/bindings/dma/amlogic,a9-dma.yaml    | 66 ++++++++++++++++++++++
>  1 file changed, 66 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/dma/amlogic,a9-dma.yaml b/Documentation/devicetree/bindings/dma/amlogic,a9-dma.yaml
> new file mode 100644
> index 000000000000..3158d99a3195
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/amlogic,a9-dma.yaml
> @@ -0,0 +1,66 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/amlogic,a9-dma.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Amlogic general DMA controller
> +
> +description:
> +  This is a general-purpose peripheral DMA controller. It currently supports
> +  major peripherals including I2C, I3C, PIO, and CAN-BUS. Transmit and receive
> +  for the same peripheral use two separate channels, controlled by different
> +  register sets. I2C and I3C transfer data in 1-byte units, while PIO and
> +  CAN-BUS transfer data in 4-byte units. From the controller’s perspective,
> +  there is no significant difference.
> +
> +maintainers:
> +  - Xianwei Zhao <xianwei.zhao@amlogic.com>
> +
> +properties:
> +  compatible:
> +    const: amlogic,a9-dma
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    const: sys
> +
> +  '#dma-cells':
> +    const: 2
> +
> +  dma-channels:
> +    $ref: /schemas/types.yaml#/definitions/uint32

Needn't it, which is standard proptery.

Frank
> +    maximum: 64
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - '#dma-cells'
> +  - dma-channels
> +
> +allOf:
> +  - $ref: dma-controller.yaml#
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    dma-controller@fe400000{
> +        compatible = "amlogic,a9-dma";
> +        reg = <0xfe400000 0x4000>;
> +        interrupts = <GIC_SPI 35 IRQ_TYPE_EDGE_RISING>;
> +        clocks = <&clkc 45>;
> +        #dma-cells = <2>;
> +        dma-channels = <28>;
> +    };
>
> --
> 2.52.0
>