linux-kernel - Re: [PATCH v4 4/9] ASoC: dt-bindings: wcd938x-sdw: add bindings for wcd938x-sdw

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Message-ID: <20210415163912.GA1524320@robh.at.kernel.org>
Date:   Thu, 15 Apr 2021 11:39:12 -0500
From:   Rob Herring <robh@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     broonie@...nel.org, devicetree@...r.kernel.org, perex@...ex.cz,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        lgirdwood@...il.com
Subject: Re: [PATCH v4 4/9] ASoC: dt-bindings: wcd938x-sdw: add bindings for
 wcd938x-sdw

On Wed, Apr 14, 2021 at 04:48:40PM +0100, Srinivas Kandagatla wrote:
> Qualcomm WCD9380/WCD9385 Codec is a standalone Hi-Fi audio codec IC
> connected over SoundWire. This device has two SoundWire devices RX and
> TX respectively. This bindings is for those slave devices on WCD9380/WCD9385.
> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  .../bindings/sound/qcom,wcd938x-sdw.yaml      | 61 +++++++++++++++++++
>  1 file changed, 61 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/qcom,wcd938x-sdw.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sound/qcom,wcd938x-sdw.yaml b/Documentation/devicetree/bindings/sound/qcom,wcd938x-sdw.yaml
> new file mode 100644
> index 000000000000..fff33c65491b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/qcom,wcd938x-sdw.yaml
> @@ -0,0 +1,61 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/qcom,wcd938x-sdw.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Bindings for Qualcomm SoundWire Slave devices on WCD9380/WCD9385
> +
> +maintainers:
> +  - Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> +
> +description: |
> +  Qualcomm WCD9380/WCD9385 Codec is a standalone Hi-Fi audio codec IC.
> +  It has RX and TX Soundwire slave devices. This bindings is for the
> +  slave devices.
> +
> +properties:
> +  compatible:
> +    const: sdw20217010d00
> +
> +  reg:
> +    maxItems: 1
> +
> +  qcom,direction:
> +    description: direction of the SoundWire device instance
> +    enum:
> +      - rx
> +      - tx

Was thinking these were some established bus properties...

This would just be implied by the 'reg' property index. You could define 
'reg-names' too I guess.

> +
> +  qcom,port-mapping:
> +    description: |
> +      Specifies static port mapping between slave and master ports.
> +      In the order of slave port index.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 4
> +    maxItems: 5

qcom,rx-port-mapping and qcom,tx-port-mapping?

Or keep a single property and the driver knows how many slave ports for 
each direction. IOW, an array of 9 with first 4 entries for tx and last 
5 for rx.

> +
> +required:
> +  - compatible
> +  - reg
> +  - qcom,direction
> +  - qcom,port-mapping
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    soundwire@...0000 {
> +        #address-cells = <2>;
> +        #size-cells = <0>;
> +        reg = <0x03230000 0x2000>;
> +
> +        codec@0,3 {
> +            compatible = "sdw20217010d00";
> +            reg  = <0 3>;
> +            qcom,direction = "tx";
> +            qcom,port-mapping = <2 3 4 5>;
> +        };
> +    };
> +
> +...
> -- 
> 2.21.0
>