linux-kernel - Re: [PATCH 1/2] dt-bindings: usb: Document WCD939x USB SubSystem Altmode/Analog Audio Switch

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Message-ID: <1dc8c529-bb30-43f0-a184-ce00b6d5e9b6@linaro.org>
Date:   Sat, 9 Dec 2023 09:11:43 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: usb: Document WCD939x USB SubSystem
 Altmode/Analog Audio Switch

On 08/12/2023 16:27, Neil Armstrong wrote:
> Document the Qualcomm WCD9390/WCD9395 USB SubSystem Altmode/Analog Audio Switch
> which is a separate USB SubSystem for Altmode/Analog Audio Switch accessible
> over an I2C interface.
> 
> Since Audio Headphone and Microphone data path between the Codec and the USB-C Mux
> subsystems are external to the IC, it requires a second port to handle USB-C altmode
> & orientation switching for Audio Accessory Mode to the Codec SubSystem.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  .../bindings/usb/qcom,wcd939x-usbss.yaml           | 99 ++++++++++++++++++++++
>  1 file changed, 99 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/qcom,wcd939x-usbss.yaml b/Documentation/devicetree/bindings/usb/qcom,wcd939x-usbss.yaml
> new file mode 100644
> index 000000000000..da86b1d119d4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/qcom,wcd939x-usbss.yaml
> @@ -0,0 +1,99 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/qcom,wcd939x-usbss.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm WCD9380/WCD9385 USB SubSystem Altmode/Analog Audio Switch
> +
> +maintainers:
> +  - Neil Armstrong <neil.armstrong@...aro.org>
> +
> +description: |

Do not need '|' unless you need to preserve formatting.

> +  Qualcomm WCD9390/WCD9395 is a standalone Hi-Fi audio codec IC with a functionally
> +  separate USB SubSystem for Altmode/Analog Audio Switch accessible over an I2C interface.

Please wrap at 80. In other descriptions as well.

> +  The Audio Headphone and Microphone data path between the Codec and the USB-C Mux
> +  subsystems are external to the IC, thus requiring DT port-endpoint graph description
> +  to handle USB-C altmode & orientation switching for Audio Accessory Mode.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - const: qcom,wcd9390-usbss
> +      - items:
> +          - const: qcom,wcd9395-usbss
> +          - const: qcom,wcd9390-usbss
> +
> +  reg:
> +    maxItems: 1
> +
> +  reset-gpios: true

This is the only GPIO from common GPIOs which actually needs maxItems.
Please add maxItems: 1



Best regards,
Krzysztof