Re: [PATCH v2 1/3] dt-bindings: dma: Add Amlogic A9 SoC DMA

[Xianwei Zhao <xianwei.zhao@amlogic.com>]

Hi Frank,
    Thanks for your reply.

On 2026/1/30 01:54, Frank Li wrote:
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> 
> [ EXTERNAL EMAIL ]
> 
> On Tue, Jan 27, 2026 at 03:27:52AM +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    | 70 ++++++++++++++++++++++
>>   1 file changed, 70 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..7d044152fd76
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/dma/amlogic,a9-dma.yaml
>> @@ -0,0 +1,70 @@
>> +# 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: |
> 
> Needn't  |
> 

Will drop '|'

>> +  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>
>> +    apb {
>> +        #address-cells = <2>;
>> +        #size-cells = <2>;
> 
> If use 32 address space, needn't apb node
> 

Will do.

> Frank
>> +        dma-controller@fe400000{
>> +            compatible = "amlogic,a9-dma";
>> +            reg = <0x0 0xfe400000 0x0 0x4000>;
>> +            interrupts = <GIC_SPI 35 IRQ_TYPE_EDGE_RISING>;
>> +            clocks = <&clkc 45>;
>> +            #dma-cells = <2>;
>> +            dma-channels = <28>;
>> +        };
>> +    };
>>
>> --
>> 2.52.0
>>

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