Re: [PATCH v2 1/2] ASoC: qcom: dt-bindings: Add sc7180 machine bindings

[Srinivas Kandagatla <srinivas.kandagatla@linaro.org>]

On 21/07/2020 11:44, Cheng-Yi Chiang wrote:
> Add devicetree bindings documentation file for sc7180 sound card.
> 
> Signed-off-by: Cheng-Yi Chiang <cychiang@chromium.org>
> ---
>   .../bindings/sound/qcom,sc7180.yaml           | 130 ++++++++++++++++++
>   1 file changed, 130 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/sound/qcom,sc7180.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sound/qcom,sc7180.yaml b/Documentation/devicetree/bindings/sound/qcom,sc7180.yaml
> new file mode 100644
> index 000000000000..82f9483276eb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/qcom,sc7180.yaml
> @@ -0,0 +1,130 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/qcom,sc7180.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Technologies Inc. SC7180 ASoC sound card driver
> +
> +maintainers:
> +  - Rohit kumar <rohitkr@codeaurora.org>
> +  - Cheng-Yi Chiang <cychiang@chromium.org>
> +
> +description:
> +  This binding describes the SC7180 sound card which uses LPASS for audio.
> +
> +definitions:
> +
> +  dai:
> +    type: object
> +    properties:
> +      sound-dai:
> +        maxItems: 1
> +        $ref: /schemas/types.yaml#/definitions/phandle-array
> +        description: phandle array of the codec or CPU DAI
> +
> +    required:
> +      - sound-dai
> +
> +properties:
> +  compatible:
> +    contains:
> +      const: qcom,sc7180-sndcard
> +
> +  audio-routing:
> +    $ref: /schemas/types.yaml#/definitions/non-unique-string-array
> +    description:
> +      A list of the connections between audio components. Each entry is a
> +      pair of strings, the first being the connection's sink, the second
> +      being the connection's source.
> +
> +  model:
> +    $ref: /schemas/types.yaml#/definitions/string
> +    description: User specified audio sound card name
> +
> +  aux-dev:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: phandle of the codec for headset detection


Why do we need this? You should be able to set the jack for codec 
snd_soc_component_set_jack()?


> +
> +patternProperties:
> +  "^dai-link(@[0-9]+)?$":
> +    description:
> +      Each subnode represents a dai link. Subnodes of each dai links would be
> +      cpu/codec dais.
> +
> +    type: object
> +
> +    properties:
> +      link-name:
> +        description: Indicates dai-link name and PCM stream name.
> +        $ref: /schemas/types.yaml#/definitions/string
> +        maxItems: 1
> +
> +      reg:
> +        description: dai link address.
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        maxItems: 1

Why do we need this?? I have not seen the parsing code using this.


> +
> +      playback-only:
> +        description: Specify that the dai link is only for playback.
> +        $ref: /schemas/types.yaml#/definitions/flag
> +
> +      capture-only:
> +        description: Specify that the dai link is only for capture.
> +        $ref: /schemas/types.yaml#/definitions/flag
> +

Are these because the cpu/codec dais are single directional?

If so you can extend snd_soc_dai_link_set_capabilities() and use this 
function.


--srini

> +      cpu:
> +        $ref: "#/definitions/dai"
> +
> +      codec:
> +        $ref: "#/definitions/dai"
> +
> +    required:
> +      - link-name
> +      - reg
> +      - cpu
> +      - codec
> +
> +    additionalProperties: false
> +
> +examples:
> +
> +  - |
> +    sound {
> +        compatible = "qcom,sc7180-sndcard";
> +        model = "sc7180-snd-card";
> +
> +        audio-routing =
> +                    "Headphone Jack", "HPOL",
> +                    "Headphone Jack", "HPOR";
> +
> +        aux-dev = <&alc5682>;
> +
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        dai-link@0 {
> +            reg = <0>;
> +            link-name = "MultiMedia0";
> +            cpu {
> +                sound-dai = <&lpass_cpu 0>;
> +            };
> +
> +            codec {
> +                sound-dai = <&alc5682 0>;
> +            };
> +        };
> +
> +        dai-link@1 {
> +            reg = <1>;
> +            link-name = "MultiMedia1";
> +            playback-only;
> +            cpu {
> +                sound-dai = <&lpass_cpu 1>;
> +            };
> +
> +            codec {
> +                sound-dai = <&max98357a>;
> +            };
> +        };
> +    };
>