[PATCH v4 1/3] dt-bindings: dma: Add Amlogic A9 SoC DMA

[Xianwei Zhao]

Hi Krzysztof,
    Thanks for your reply.

On 2026/2/27 17:18, Krzysztof Kozlowski wrote:
> On Fri, Feb 27, 2026 at 07:20:53AM +0000, Xianwei Zhao wrote:
>> Add documentation describing the Amlogic A9 SoC DMA. And add
>> the properties specific values defines into a new include file.
>>
>> Signed-off-by: Xianwei Zhao<xianwei.zhao at amlogic.com>
>> ---
>>   .../devicetree/bindings/dma/amlogic,a9-dma.yaml    | 65 ++++++++++++++++++++++
>>   include/dt-bindings/dma/amlogic-dma.h              |  8 +++
>>   2 files changed, 73 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..efd7b2602c33
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/dma/amlogic,a9-dma.yaml
>> @@ -0,0 +1,65 @@
>> +# 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
>> +
>> +  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-dma.h b/include/dt-bindings/dma/amlogic-dma.h
> Filename must be the same as binding file.
>

Will do.

>> new file mode 100644
>> index 000000000000..025ecc42e395
>> --- /dev/null
>> +++ b/include/dt-bindings/dma/amlogic-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 AML_DMA_TYPE_TX              0
>> +#define AML_DMA_TYPE_RX              1
> You sure you need AML prefix? Your clock constants do not have AML
> prefixes. What other constants do you expect here?
> 

I will delete AML prefix in next version.

> Best regards,
> Krzysztof