[v2] Add Amlogic general DMA

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

Posted by Xianwei Zhao via B4 Relay 1 week, 6 days ago

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    | 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: |
+  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>;
+        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

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

Posted by Frank Li 1 week, 4 days ago

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  |

> +  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

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
>

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

Posted by Xianwei Zhao 1 week ago

Hi Frank,
    Thanks for your reply.

On 2026/1/30 01:54, Frank Li wrote:
> [You don't often get email from frank.li@nxp.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> 
> [ 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
>>