linux-kernel - Re: [PATCH 1/3] dt-bindings: sound: Add Apple MCA I2S transceiver

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Date:   Tue, 9 Aug 2022 11:15:49 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Martin Povišer <povik+lin@...ebit.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     asahi@...ts.linux.dev, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: sound: Add Apple MCA I2S transceiver

On 09/08/2022 01:41, Martin Povišer wrote:
> Add binding schema for MCA I2S transceiver found on Apple M1 and other
> chips.


Thank you for your patch. There is something to discuss/improve.

> +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

How about alphabetical order?

> +      - const: apple,mca
> +
> +  reg:
> +    items:
> +      - description: Register region of the MCA clusters proper
> +      - description: Register region of the DMA glue and its FIFOs
> +
> +  interrupts:
> +    minItems: 4
> +    maxItems: 6
> +    description:
> +      One interrupt per each cluster
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  dmas:
> +    minItems: 16
> +    maxItems: 24
> +    description:
> +      DMA channels corresponding to the SERDES units in the peripheral. They are
> +      listed in groups of four per cluster, and within the group they are given
> +      as associated to the TXA, RXA, TXB, RXB units.
> +
> +  dma-names:
> +    minItems: 16
> +    maxItems: 24
> +    items:
> +      pattern: '^(tx|rx)[0-5][ab]$'

Use consistent quotes (everywhere " or ').

Describe the items because otherwise you allow any order. The list will
be unfortunately quite long, but still readable enough.


> +    description: |
> +      Names for the DMA channels: 'tx'/'rx', then cluster number, then 'a'/'b'
> +      based on the associated SERDES unit.
> +
> +  clocks:
> +    minItems: 4
> +    maxItems: 6
> +    description:
> +      Clusters' input reference clock.
> +
> +  resets:
> +    maxItems: 1
> +
> +  power-domains:
> +    minItems: 5
> +    maxItems: 7
> +    description:
> +      First a general 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'

Use consistent quotes (everywhere " or ').

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    mca: mca@...00000 {

You called it I2S transceiver but isn't it also actually I2S controller?
If yes, then the node name should be probably "i2s".

> +      compatible = "apple,t6000-mca", "apple,mca";
> +      reg = <0x9b600000 0x10000>,
> +            <0x9b200000 0x20000>;
> +


Best regards,
Krzysztof