linux-kernel - Re: [PATCH 1/2] dt-bindings: dma: Add Apple ADMAC

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Message-ID: <YkU6yvUQ6v4VdXiJ@matsya>
Date:   Thu, 31 Mar 2022 10:53:22 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Martin Povišer <povik+lin@...ebit.org>
Cc:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        linux-arm-kernel@...ts.infradead.org, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mark Kettenis <kettenis@...nbsd.org>
Subject: Re: [PATCH 1/2] dt-bindings: dma: Add Apple ADMAC

On 30-03-22, 18:44, Martin Povišer wrote:
> Apple's Audio DMA Controller (ADMAC) is used to fetch and store audio
> samples on Apple SoCs from the "Apple Silicon" family.
> 
> Signed-off-by: Martin Povišer <povik+lin@...ebit.org>
> ---
>  .../devicetree/bindings/dma/apple,admac.yaml  | 73 +++++++++++++++++++
>  1 file changed, 73 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/apple,admac.yaml
> 
> diff --git a/Documentation/devicetree/bindings/dma/apple,admac.yaml b/Documentation/devicetree/bindings/dma/apple,admac.yaml
> new file mode 100644
> index 000000000000..34f76a9a2983
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/apple,admac.yaml
> @@ -0,0 +1,73 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/apple,admac.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Apple Audio DMA Controller (ADMAC)
> +
> +description: |
> +  Apple's Audio DMA Controller (ADMAC) is used to fetch and store
> +  audio samples on Apple SoCs from the "Apple Silicon" family.
> +
> +maintainers:
> +  - Martin Povišer <povik+lin@...ebit.org>
> +
> +allOf:
> +  - $ref: "dma-controller.yaml#"
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - apple,t6000-admac
> +          - apple,t8103-admac
> +      - const: apple,admac
> +
> +  reg:
> +    maxItems: 1
> +
> +  '#dma-cells':
> +    const: 1
> +
> +  apple,internal-irq-destination:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Index influencing internal routing of the IRQs
> +      within the peripheral.

do you have more details for this, is this for peripheral and if so
suited to be in dam-cells?

> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - '#dma-cells'
> +  - dma-channels
> +  - apple,internal-irq-destination
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/apple-aic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    dart_sio: iommu@...004000 {
> +      compatible = "apple,t8103-dart", "apple,dart";
> +      reg = <0x2 0x35004000 0x0 0x4000>;
> +      interrupt-parent = <&aic>;
> +      interrupts = <AIC_IRQ 635 IRQ_TYPE_LEVEL_HIGH>;
> +      #iommu-cells = <1>;
> +    };
> +
> +    admac: dma-controller@...200000 {
> +      compatible = "apple,t8103-admac", "apple,admac";
> +      reg = <0x2 0x38200000 0x0 0x34000>;
> +      dma-channels = <12>;
> +      interrupt-parent = <&aic>;
> +      interrupts = <AIC_IRQ 626 IRQ_TYPE_LEVEL_HIGH>;
> +      #dma-cells = <1>;
> +      iommus = <&dart_sio 2>;
> +      apple,internal-irq-destination = <1>;
> +    };
> -- 
> 2.33.0

-- 
~Vinod