linux-kernel - Re: [PATCH v2 1/9] dt-bindings: soc: qcom: eud: Restructure to model multi-path hardware

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Message-ID: <a16563a6-b338-42b0-8e04-b1ec56145175@oss.qualcomm.com>
Date: Wed, 4 Feb 2026 15:01:29 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Elson Serrao <elson.serrao@....qualcomm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Souradeep Chowdhury <quic_schowdhu@...cinc.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/9] dt-bindings: soc: qcom: eud: Restructure to model
 multi-path hardware

On 1/27/26 12:38 AM, Elson Serrao wrote:
> The Qualcomm Embedded USB Debugger (EUD) can intercept one or two
> independent High-Speed UTMI paths, depending on the SoC. Each path is
> distinct with its own HS-PHY interface, connector/controller wiring, and
> UTMI routing behavior. The EUD hardware sits between the USB2 PHY and
> the USB controller on each path.
> 
> The existing binding models only a single UTMI path and does not provide
> a way to associate the required High-Speed USB PHY. EUD relies on the
> HS-PHY on the selected UTMI path for link signalling and correct operation
> of the hardware.
> 
> Historically, EUD has worked on platforms that use a single UTMI path
> because the USB controller maintains ownership of the PHY during
> enumeration and normal operation. This implicit relationship allowed
> EUD to function even though the dependency on the PHY was not described
> in the binding. However, this behavior is not guaranteed by hardware.
> The current binding description is not sufficient for SoCs that expose
> two independent UTMI paths, where the PHY association and port wiring
> must be explicitly described.
> 
> Introduce per-path eud-path child nodes so each UTMI path can describe
> its HS-PHY, port connections, and the role‑switching capability of its
> associated USB port.
> 
> Signed-off-by: Elson Serrao <elson.serrao@....qualcomm.com>
> ---

[...]

> +patternProperties:
> +  "^eud-path@[0-1]$":

At least a since instance of this should be 'required'

Konrad