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

Srinivas Kandagatla
2020-07-22T09:25:27Z

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>;
> + };
> + };
> + };
>