[PATCH v12 1/3] dt-bindings: dma: Add Amlogic A9 SoC DMA

[Xianwei Zhao]

Hi Krzysztof,
    Based on the bot and Vinod's suggestions, I added a prefix 
"AMLOGIC_A9" for channel type. I didn't remove your Reviewed-by tag for 
this change. Is this appropriate?

On 2026/9/3 15:38, Xianwei Zhao via B4 Relay wrote:
> From: Xianwei Zhao<xianwei.zhao at amlogic.com>
> 
> Add documentation describing the Amlogic A9 SoC DMA. And add
> the properties specific values defines into a new include file.
> 
> Reviewed-by: Krzysztof Kozlowski<krzysztof.kozlowski at oss.qualcomm.com>
> Signed-off-by: Xianwei Zhao<xianwei.zhao at amlogic.com>
> ---
>   .../devicetree/bindings/dma/amlogic,a9-dma.yaml    | 68
> ++++++++++++++++++++++
>   include/dt-bindings/dma/amlogic,a9-dma.h           |  8 +++
>   2 files changed, 76 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..3e1a4fba3047
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/amlogic,a9-dma.yaml
> @@ -0,0 +1,68 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id:http://devicetree.org/schemas/dma/amlogic,a9-dma.yaml#
> +$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 at 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
> +    description:
> +      The first cell is the DMA channel type(AMLOGIC_A9_DMA_TX or AMLOGIC_A9_DMA_RX).
> +      The second cell is the DMA channel index.
> +
> +  dma-channels:
> +    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 at 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>;
> +    };
> diff --git a/include/dt-bindings/dma/amlogic,a9-dma.h b/include/dt-bindings/dma/amlogic,a9-dma.h
> new file mode 100644
> index 000000000000..ea7c90063572
> --- /dev/null
> +++ b/include/dt-bindings/dma/amlogic,a9-dma.h
> @@ -0,0 +1,8 @@
> +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
> +
> +#ifndef __DT_BINDINGS_DMA_AMLOGIC_DMA_H__
> +#define __DT_BINDINGS_DMA_AMLOGIC_DMA_H__
> +
> +#define AMLOGIC_A9_DMA_TX              0
> +#define AMLOGIC_A9_DMA_RX              1
> +#endif /* __DT_BINDINGS_DMA_AMLOGIC_DMA_H__ */