linux-kernel - Re: [PATCH 0/8] Enable EUD on Qualcomm sm8450 SoC

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Message-ID: <023d4ea8-635d-435f-bae2-87284f70123b@linaro.org>
Date: Wed, 31 Jul 2024 13:13:47 +0200
From: Caleb Connolly <caleb.connolly@...aro.org>
To: Elson Roy Serrao <quic_eserrao@...cinc.com>, andersson@...nel.org,
 konrad.dybcio@...aro.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, gregkh@...uxfoundation.org
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 0/8] Enable EUD on Qualcomm sm8450 SoC

Hi,

On 31/07/2024 00:24, Elson Roy Serrao wrote:
> The Embedded USB Debugger (EUD) is a mini High-Speed USB on-chip hub to
> support the USB-based debug and trace capabilities on Qualcomm devices.
> The current implementation lacks in below aspects that are needed for
> proper EUD functionality.
> 
> 1.) HS-Phy control: EUD being a HS hub needs HS-Phy support for it's
>      operation. Hence EUD module should enable/disable HS-phy
>      accordingly.
> 	
> 2.) Proper routing of USB role switch notifications: EUD hub is physically
>      present in between the USB connector and the USB controller. So the
>      usb role switch notifications originating from the connector should
>      route through EUD. EUD also relies on role switch notifications to
>      communicate with the USB, regarding EUD attach/detach events.
> 
> This series aims at implementing the above aspects to enable EUD on
> Qualcomm sm8450 SoC.

Are there any plans to make this feature available for folks outside of 
Qualcomm / an NDA?

There is an openOCD fork on CodeLinaro but it still requires some 
proprietary library which is only available to folks with a quicinc 
email as I understand it.

Kind regards,

~ someone eager for JTAG access
> 
> Elson Roy Serrao (8):
>    dt-bindings: soc: qcom: eud: Add phy related bindings
>    dt-bindings: soc: qcom: eud: Add usb role switch property
>    dt-bindings: soc: qcom: eud: Add compatible for sm8450
>    arm64: dts: qcom: sm8450: Add EUD node
>    arm64: dts: qcom: Enable EUD on sm8450 hdk
>    usb: misc: eud: Add High-Speed Phy control for EUD operations
>    usb: misc: eud: Handle usb role switch notifications
>    usb: misc: eud: Add compatible for sm8450
> 
>   .../bindings/soc/qcom/qcom,eud.yaml           |  17 +++
>   arch/arm64/boot/dts/qcom/sm8450-hdk.dts       |  15 ++-
>   arch/arm64/boot/dts/qcom/sm8450.dtsi          |  29 ++++
>   drivers/usb/misc/qcom_eud.c                   | 125 +++++++++++++++---
>   4 files changed, 164 insertions(+), 22 deletions(-)
> 

-- 
// Caleb (they/them)