linux-kernel - [PATCH 0/9] Improve Qualcomm EUD driver and platform support

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Message-Id: <20260116232106.2234978-1-elson.serrao@oss.qualcomm.com>
Date: Fri, 16 Jan 2026 15:20:57 -0800
From: Elson Serrao <elson.serrao@....qualcomm.com>
To: 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: [PATCH 0/9] Improve Qualcomm EUD driver and platform support

The Embedded USB Debugger (EUD) is a High-Speed USB on-chip hub that
provides debug and trace capabilities on Qualcomm platforms. The current
EUD driver, however, lacks essential hardware resources such as PHY
references and support for multi-port configurations. This series
addresses those gaps and introduces the necessary device tree updates
to enable testing and validation of the enhanced functionality.

This work builds upon an earlier EUD driver submission:
https://lore.kernel.org/all/20240730222439.3469-1-quic_eserrao@quicinc.com/
and extends it with support for multi-port use cases and proper handling
of EUD operation across different USB roles.

The series has been validated on the Qualcomm Dragonwing Q6 platform
(RB3 Gen2 board), confirming successful OpenOCD connectivity to the EUD
interface. For detailed usage instructions, refer to Qualcomm’s Linux
kernel debugging guide:
https://docs.qualcomm.com/bundle/publicresource/topics/80-70020-12/debugging_linux_kernel.html#debug-using-openocd

Elson Serrao (9):
  dt-bindings: soc: qcom: eud: Restructure to model multi-path hardware
  usb: misc: qcom_eud: add sysfs attribute for port selection
  usb: misc: qcom_eud: add per-path High-Speed PHY control
  usb: misc: qcom_eud: add per-path role switch support
  usb: misc: qcom_eud: improve enable_store API
  usb: misc: qcom_eud: add host mode coordination
  usb: misc: qcom_eud: fix virtual attach/detach event handling
  arm64: dts: qcom: kodiak: Align EUD node with binding
  arm64: dts: qcom: qcs6490-rb3gen2: Enable EUD debug functionality

 Documentation/ABI/testing/sysfs-driver-eud    |  16 +
 .../bindings/soc/qcom/qcom,eud.yaml           |  97 +++--
 arch/arm64/boot/dts/qcom/kodiak.dtsi          |  33 +-
 arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts  |  20 +-
 drivers/usb/misc/qcom_eud.c                   | 365 +++++++++++++++++-
 5 files changed, 474 insertions(+), 57 deletions(-)

-- 
2.34.1