Re: [PATCH v1 3/5] dt-bindings: dma: Add CIX Sky1 DMA-350 integration

[Conor Dooley <conor@kernel.org>]

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On Mon, Sep 07, 2026 at 11:34:02AM +0800, Jelly Jia wrote:
> Document the CIX Sky1 integration wrapper around an Arm DMA-350 controller.
> 
> The wrapper owns SoC integration resources. The child node describes the
> generic Arm DMA-350 IP.
> 
> Signed-off-by: Jelly Jia <Jelly.Jia@cixtech.com>
> ---
>  .../bindings/dma/cix,sky1-dma350.yaml         | 102 ++++++++++++++++++
>  MAINTAINERS                                   |   1 +
>  2 files changed, 103 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/cix,sky1-dma350.yaml
> 
> diff --git a/Documentation/devicetree/bindings/dma/cix,sky1-dma350.yaml b/Documentation/devicetree/bindings/dma/cix,sky1-dma350.yaml
> new file mode 100644
> index 000000000000..e533f355d135
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/cix,sky1-dma350.yaml
> @@ -0,0 +1,102 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/cix,sky1-dma350.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: CIX Sky1 DMA-350 Integration
> +
> +maintainers:
> +  - CIX Kernel Team <cix-kernel-upstream@cixtech.com>
> +
> +description:
> +  The CIX Sky1 DMA-350 integration driver owns SoC resources around an
> +  Arm DMA-350 controller, such as clocks, resets, interrupt routing, and
> +  optional reserved memory. Reserved memory is described on this parent node
> +  and assigned by the integration driver to the child DMA-350 device. The child
> +  node describes the generic DMA-350 IP.

I cannot really speak to whether this is a correct thing to do with a
dma-350, but it seems to me like something that should be resolved with
a device specific comaptible in the dma-350 node. Someone more familar
with the IP will have to comment on that.

However I would like to know how this impacts the existing dma-350 in he
sky1 devicetree.

> +
> +properties:
> +  $nodename:
> +    pattern: "^dma@[0-9a-f]+$"
> +
> +  compatible:
> +    const: cix,sky1-dma350
> +
> +  "#address-cells":
> +    const: 2
> +
> +  "#size-cells":
> +    const: 2
> +
> +  ranges: true
> +
> +  dma-ranges: true
> +
> +  clocks:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  cix,irq-router:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Syscon phandle for the Sky1 subsystem register block that routes
> +      DMA-350 channel interrupts to the AP interrupt controller.
> +
> +  memory-region:
> +    maxItems: 1
> +    description:
> +      Reserved memory pool assigned by the CIX Sky1 DMA-350 integration driver
> +      to the child Arm DMA-350 device.
> +
> +patternProperties:
> +  '^dma-controller@[0-9a-f]+$':
> +    $ref: arm,dma-350.yaml#
> +
> +required:
> +  - compatible
> +  - "#address-cells"
> +  - "#size-cells"
> +  - ranges
> +  - dma-ranges
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    / {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +        interrupt-parent = <&gic>;
> +
> +        gic: interrupt-controller {
> +            #address-cells = <0>;
> +            interrupt-controller;
> +            #interrupt-cells = <4>;
> +        };
> +
> +        dma@7010000 {
> +            compatible = "cix,sky1-dma350";
> +            #address-cells = <2>;
> +            #size-cells = <2>;
> +            ranges = <0x0 0x0 0x0 0x07010000 0x0 0x10000>;
> +            dma-ranges = <0x0 0x20000000 0x0 0x07010000 0x0 0x00100000>;
> +            clocks = <&clk 9>;
> +            resets = <&rst 15>;
> +            cix,irq-router = <&audss_cru>;
> +
> +            dma-controller@0 {
> +                compatible = "arm,dma-350";
> +                reg = <0x0 0x0 0x0 0x10000>;
> +                interrupts = <GIC_SPI 230 IRQ_TYPE_LEVEL_HIGH 0>;
> +                #dma-cells = <1>;
> +            };
> +        };
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 3a19da74d00c..feff8f9ecb2b 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2825,6 +2825,7 @@ L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
>  S:	Maintained
>  T:	git https://github.com/cixtech/linux-mainline.git
>  F:	Documentation/devicetree/bindings/arm/cix.yaml
> +F:	Documentation/devicetree/bindings/dma/cix,sky1-dma350.yaml
>  F:	Documentation/devicetree/bindings/mailbox/cix,sky1-mbox.yaml
>  F:	arch/arm64/boot/dts/cix/
>  F:	drivers/mailbox/cix-mailbox.c
> -- 
> 2.54.0
> 

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