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

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Message-ID: <aXue7DTy7mgwxeks@lizhi-Precision-Tower-5810>
Date: Thu, 29 Jan 2026 12:54:52 -0500
From: Frank Li <Frank.li@....com>
To: Xianwei Zhao <xianwei.zhao@...ogic.com>
Cc: Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-amlogic@...ts.infradead.org, dmaengine@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: dma: Add Amlogic A9 SoC DMA

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@...ogic.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@...ogic.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@...00000{
> +            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
>