Message-ID: <c3bcefc9-61de-44aa-8412-17ea42e7048c@kernel.org>
Date: Wed, 17 Apr 2024 16:16:00 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Shengjiu Wang <shengjiu.wang@....com>, lgirdwood@...il.com,
 broonie@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, shengjiu.wang@...il.com, linux-sound@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: dt-bindings: fsl,ssi: Convert to YAML

On 17/04/2024 11:25, Shengjiu Wang wrote:
> Convert the fsl,ssi binding to YAML.
> 

..

> +description:
> +  Notes on fsl,playback-dma and fsl,capture-dma
> +  On SOCs that have an SSI, specific DMA channels are hard-wired for playback
> +  and capture.  On the MPC8610, for example, SSI1 must use DMA channel 0 for
> +  playback and DMA channel 1 for capture.  SSI2 must use DMA channel 2 for
> +  playback and DMA channel 3 for capture.  The developer can choose which
> +  DMA controller to use, but the channels themselves are hard-wired.  The
> +  purpose of these two properties is to represent this hardware design.
> +
> +  The device tree nodes for the DMA channels that are referenced by
> +  "fsl,playback-dma" and "fsl,capture-dma" must be marked as compatible with
> +  "fsl,ssi-dma-channel".  The SOC-specific compatible string (e.g.
> +  "fsl,mpc8610-dma-channel") can remain.  If these nodes are left as
> +  "fsl,elo-dma-channel" or "fsl,eloplus-dma-channel", then the generic Elo DMA
> +  drivers (fsldma) will attempt to use them, and it will conflict with the
> +  sound drivers.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - items:
> +          - enum:
> +              - fsl,imx50-ssi
> +              - fsl,imx53-ssi
> +          - enum:
> +              - fsl,imx51-ssi
> +          - enum:
> +              - fsl,imx21-ssi

That's a mess... you cannot have enums as fallbacks.

> +      - items:
> +          - enum:
> +              - fsl,imx25-ssi
> +              - fsl,imx27-ssi
> +              - fsl,imx35-ssi
> +              - fsl,imx51-ssi
> +              - fsl,imx6q-ssi
> +              - fsl,imx6sl-ssi
> +              - fsl,imx6sx-ssi
> +          - enum:
> +              - fsl,imx21-ssi
> +              - fsl,imx51-ssi
> +      - items:
> +          - const: fsl,mpc8610-ssi
> +
> +  cell-index:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [0, 1, 2]
> +    description: The SSI index
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  fsl,fifo-depth:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      The number of elements in the transmit and receive FIFOs.
> +      This number is the maximum allowed value for SFCSR[TFWM0].
> +
> +  clocks:
> +    items:
> +      - description: The ipg clock for register access
> +      - description: clock for SSI master mode
> +    minItems: 1
> +
> +  clock-names:
> +    items:
> +      - const: ipg
> +      - const: baud
> +    minItems: 1
> +
> +  dmas:
> +    oneOf:
> +      - items:
> +          - description: DMA controller phandle and request line for RX
> +          - description: DMA controller phandle and request line for TX
> +      - items:
> +          - description: DMA controller phandle and request line for RX0
> +          - description: DMA controller phandle and request line for TX0
> +          - description: DMA controller phandle and request line for RX1
> +          - description: DMA controller phandle and request line for TX1
> +
> +  dma-names:
> +    oneOf:
> +      - items:
> +          - const: rx
> +          - const: tx
> +      - items:
> +          - const: rx0
> +          - const: tx0
> +          - const: rx1
> +          - const: tx1
> +
> +  codec-handle:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to a 'codec' node that defines an audio
> +      codec connected to this SSI.  This node is typically
> +      a child of an I2C or other control node.
> +
> +  fsl,fiq-stream-filter:
> +    type: boolean
> +    description:
> +      Disabled DMA and use FIQ instead to filter the codec stream.
> +      This is necessary for some boards where an incompatible codec
> +      is connected to this SSI, e.g. on pca100 and pcm043.
> +
> +  fsl,mode:
> +    $ref: /schemas/types.yaml#/definitions/string
> +    enum: [ ac97-slave, ac97-master, i2s-slave, i2s-master,
> +            lj-slave, lj-master, rj-slave, rj-master ]
> +    description: |
> +      "ac97-slave" - AC97 mode, SSI is clock slave
> +      "ac97-master" - AC97 mode, SSI is clock master
> +      "i2s-slave" - I2S mode, SSI is clock slave
> +      "i2s-master" - I2S mode, SSI is clock master
> +      "lj-slave" - Left justified mode, SSI is clock slave
> +      "lj-master" - Left justified mode, SSI is clock master
> +      "rj-slave" - Right justified mode, SSI is clock slave
> +      "rj-master" - Right justified mode, SSI is clock master
> +
> +  fsl,ssi-asynchronous:
> +    type: boolean
> +    description: If specified, the SSI is to be programmed in asynchronous
> +      mode.  In this mode, pins SRCK, STCK, SRFS, and STFS must
> +      all be connected to valid signals.  In synchronous mode,
> +      SRCK and SRFS are ignored.  Asynchronous mode allows
> +      playback and capture to use different sample sizes and
> +      sample rates.  Some drivers may require that SRCK and STCK
> +      be connected together, and SRFS and STFS be connected
> +      together.  This would still allow different sample sizes,
> +      but not different sample rates.
> +
> +  fsl,playback-dma:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: Phandle to a node for the DMA channel to use for
> +      playback of audio.  This is typically dictated by SOC
> +      design. Only used on Power Architecture.
> +
> +  fsl,capture-dma:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: Phandle to a node for the DMA channel to use for
> +      capture (recording) of audio.  This is typically dictated
> +      by SOC design. Only used on Power Architecture.
> +
> +  "#sound-dai-cells":
> +    const: 0
> +    description: optional, some dts node didn't add it.

The question is: is this DAI or not?

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - fsl,fifo-depth
> +
> +unevaluatedProperties: false

This must be additionalProperties:false. Use example-schema as
reference... unless you want to reference dai-common.yaml, but then that
one is missing.

Best regards,
Krzysztof

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