linux-kernel - Re: [RFC PATCH v2 1/5] dt-bindings: sound: Add Apple MCA I2S transceiver

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Date:   Thu, 9 Jun 2022 12:44:05 -0600
From:   Rob Herring <robh@...nel.org>
To:     Martin Povišer <povik+lin@...ebit.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mark Kettenis <kettenis@...nbsd.org>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>, asahi@...ts.linux.dev
Subject: Re: [RFC PATCH v2 1/5] dt-bindings: sound: Add Apple MCA I2S
 transceiver

On Mon, Jun 06, 2022 at 09:19:06PM +0200, Martin Povišer wrote:
> Add binding schema for MCA I2S transceiver found on Apple M1 and other
> chips.
> 
> Signed-off-by: Martin Povišer <povik+lin@...ebit.org>
> ---
>  .../devicetree/bindings/sound/apple,mca.yaml  | 102 ++++++++++++++++++
>  1 file changed, 102 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/apple,mca.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sound/apple,mca.yaml b/Documentation/devicetree/bindings/sound/apple,mca.yaml
> new file mode 100644
> index 000000000000..c8a36d8c38ad
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/apple,mca.yaml
> @@ -0,0 +1,102 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/apple,mca.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Apple MCA I2S transceiver
> +
> +description: |
> +  MCA is an I2S transceiver peripheral found on M1 and other Apple chips. It is
> +  composed of a number of identical clusters which can operate independently
> +  or in an interlinked fashion. Up to 6 clusters have been seen on an MCA.
> +
> +maintainers:
> +  - Martin Povišer <povik+lin@...ebit.org>
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - apple,t8103-mca
> +          - apple,t6000-mca
> +      - const: apple,mca
> +
> +  reg:
> +    minItems: 2
> +    maxItems: 2

Need to define what each entry is.

> +
> +  interrupts:
> +    maxItems: 6
> +    description: |
> +      One interrupt per each cluster
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  dmas:
> +    minItems: 16
> +    maxItems: 24
> +    description: |
> +      DMA channels associated to the SERDES units within the peripheral. They
> +      are listed in groups of four per cluster, and within the cluster they are
> +      given in order TXA, RXA, TXB, RXB of the respective SERDES units.
> +
> +  dma-names:
> +    minItems: 16
> +    maxItems: 24
> +    description: |
> +      Names for the DMA channels: 'tx'/'rx', then cluster number, then 'a'/'b'
> +      based on the associated SERDES unit.

Express as a schema: 

items:
  pattern: '^(tx|rx)[0-5][ab]$'

> +
> +  clocks:
> +    minItems: 4
> +    maxItems: 6
> +    description: |
> +      Clusters' input reference clock.
> +
> +  power-domains:
> +    minItems: 5
> +    maxItems: 7
> +    description: |
> +      First the overall power domain for register access, then the power
> +      domains of individual clusters for their operation.
> +
> +  "#sound-dai-cells":
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - dmas
> +  - dma-names
> +  - clocks
> +  - power-domains
> +  - '#sound-dai-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    mca: mca@...00000 {
> +      compatible = "apple,t6000-mca", "apple,mca";
> +      reg = <0x9b600000 0x10000>,
> +            <0x9b500000 0x20000>;
> +
> +      clocks = <&nco 0>, <&nco 1>, <&nco 2>, <&nco 3>;
> +      power-domains = <&ps_audio_p>, <&ps_mca0>, <&ps_mca1>,
> +                      <&ps_mca2>, <&ps_mca3>;
> +      dmas = <&admac 0>, <&admac 1>, <&admac 2>, <&admac 3>,
> +             <&admac 4>, <&admac 5>, <&admac 6>, <&admac 7>,
> +             <&admac 8>, <&admac 9>, <&admac 10>, <&admac 11>,
> +             <&admac 12>, <&admac 13>, <&admac 14>, <&admac 15>;
> +      dma-names = "tx0a", "rx0a", "tx0b", "rx0b",
> +                  "tx1a", "rx1a", "tx1b", "rx1b",
> +                  "tx2a", "rx2a", "tx2b", "rx2b",
> +                  "tx3a", "rx3a", "tx3b", "rx3b";
> +
> +      #sound-dai-cells = <1>;
> +    };
> -- 
> 2.33.0
> 
>