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

From: Bjorn Andersson
Date: Tue Nov 23 2021 - 22:37:17 EST


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@xxxxxxxxxxxxxx>
> ---
> .../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@xxxxxxxxxxxxxx>
> +
> +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@88e0000 {
> + 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

> + };
> --
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>