linux-kernel - Re: [PATCH V3 1/7] dt-bindings: Add the yaml bindings for EUD

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Date:   Tue, 11 Jan 2022 19:08:31 -0600
From:   Rob Herring <robh@...nel.org>
To:     Souradeep Chowdhury <quic_schowdhu@...cinc.com>
Cc:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, pure.logic@...us-software.ie,
        bjorn.andersson@...aro.org, greg@...ah.com,
        linux-kernel@...r.kernel.org, tsoni@...eaurora.org,
        psodagud@...eaurora.org, satyap@...eaurora.org,
        pheragu@...eaurora.org, rnayak@...eaurora.org,
        sibis@...eaurora.org, saiprakash.ranjan@...eaurora.org
Subject: Re: [PATCH V3 1/7] dt-bindings: Add the yaml bindings for EUD

On Tue, Jan 04, 2022 at 05:28:14PM +0530, Souradeep Chowdhury wrote:
> Documentation for Embedded USB Debugger(EUD) device tree
> bindings in yaml format.

I agree with Bjorn's comments.

> 
> Signed-off-by: Souradeep Chowdhury <quic_schowdhu@...cinc.com>
> ---
>  .../devicetree/bindings/soc/qcom/qcom,eud.yaml     | 50 ++++++++++++++++++++++
>  1 file changed, 50 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml
> 
> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml b/Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml
> new file mode 100644
> index 0000000..3523932
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml
> @@ -0,0 +1,50 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/soc/qcom/qcom,eud.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Qualcomm Embedded USB Debugger
> +
> +maintainers:
> +  - Souradeep Chowdhury <quic_schowdhu@...cinc.com>
> +
> +description:
> +  This binding is used to describe the Qualcomm Embedded USB Debugger, which is
> +  mini USB-hub implemented on chip to support USB-based debug capabilities.
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - qcom,sc7280-eud
> +      - const: qcom,eud
> +
> +  reg:
> +    items:
> +      - description: EUD Base Register Region
> +      - description: EUD Mode Manager Register
> +
> +  interrupts:
> +    description:
> +      EUD interrupt

Just 'maxItems: 1' is sufficient here.

> +
> +  port:

Based on Bjorn's comment, you will need 2 port nodes.

> +    description:
> +      This port is to be attached to the endpoint of the connector child of
> +      DWC3 controller node. The controller has the "usb-role-switch" property.
> +    $ref: /schemas/graph.yaml#/properties/port
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    eud@...0000 {
> +           compatible = "qcom,sc7280-eud","qcom,eud";
> +           reg = <0x88e0000 0x2000>,
> +                 <0x88e2000 0x1000>;

Are the ports really optional?

> +    };
> -- 
> 2.7.4
> 
>