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    SubjectRe: [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@cutebit.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@cutebit.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@9b600000 {
    > + 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
    >
    >

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