linux-kernel - Re: [PATCH V1 1/8] dt-bindings: Add the yaml bindings for EUD

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Message-ID: <YZ2zx4/8+yCcls/G@ripper>
Date:   Tue, 23 Nov 2021 19:38:47 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Souradeep Chowdhury <schowdhu@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, pure.logic@...us-software.ie,
        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,
        quic_schowdhu@...cinc.com
Subject: Re: [PATCH V1 1/8] dt-bindings: Add the yaml bindings for EUD

On Mon 22 Nov 20:28 PST 2021, Souradeep Chowdhury wrote:

> Documentation for Embedded USB Debugger(EUD) device tree
> bindings in yaml format.
> 
> Signed-off-by: Souradeep Chowdhury <schowdhu@...eaurora.org>
> ---
>  .../devicetree/bindings/soc/qcom/qcom,eud.yaml     | 52 ++++++++++++++++++++++
>  1 file changed, 52 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..724552c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml
> @@ -0,0 +1,52 @@
> +# 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 <schowdhu@...eaurora.org>
> +
> +description: |

The '|' indicates that the formatting is significant, but it's not.

> +  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
> +
> +

Drop one of these two empty lines please.

> +  port:
> +    description:
> +      Any connector to the data bus of this controller should be modelled
> +      using the OF graph bindings specified, if the "usb-role-switch"
> +      property is used. See graph.txt

This description does unfortunately not help me to understand what to
point this port to.

What's "the data bus"?

Is usb-role-switch a property to be put in this node? Doesn't it need to
be mentioned as a valid property?

> +    $ref: /schemas/graph.yaml#/properties/port
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    eud@...0000 {
> +           compatible = "qcom,sc7280-eud","qcom,eud";
> +           reg = <0 0x88e0000 0 0x2000>,
> +                 <0 0x88e2000 0 0x1000>;

The example is compiled with #address-cells == #size-cells == 1, so drop
the four lone 0s from the reg.

Regards,
Bjorn

> +    };
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>