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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1247d90ce0dsm19948967c88.4.2026.01.26.15.38.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Jan 2026 15:38:31 -0800 (PST) From: Elson Serrao To: Greg Kroah-Hartman , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Souradeep Chowdhury Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 0/9] Improve Qualcomm EUD driver and platform support Date: Mon, 26 Jan 2026 15:38:21 -0800 Message-Id: <20260126233830.2193816-1-elson.serrao@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: SPnDVFy_s4P6EtLjs2Qv3kSBrdoNyfyq X-Authority-Analysis: v=2.4 cv=YpcChoYX c=1 sm=1 tr=0 ts=6977faf9 cx=c_pps a=JYo30EpNSr/tUYqK9jHPoA==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=COk6AnOGAAAA:8 a=EUspDBNiAAAA:8 a=AzGkZF0M6A1vzCAPr_4A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=LnhvVPq8fVUA:10 a=Fk4IpSoW4aLDllm1B1p-:22 a=TjNXssC_j7lpFel5tvFf:22 X-Proofpoint-ORIG-GUID: SPnDVFy_s4P6EtLjs2Qv3kSBrdoNyfyq X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTI2MDIwMiBTYWx0ZWRfXxZHDdEzx0xF6 nsyDtkYr9GTlAnKXEOpdktXq4cJpa4S+4gi4MFAw79stadTIvB7IdkEMT5TRw9sd1udbULnXkrs pzglyHMqqpfJoqnfS0c5q3EZqK5ipGom4N8r1jtNxfxf07rV1Se/KUIdojCixO4rpLRS6E+RHGU D7v3lz2JSLlWuyXXUuzKXzQ54+DR8vLjRSOMax6G8uxwKCFxFWVUgTBsqRrASisEI/tGOsqhjlP rgunaRp1W3ZFbtB6QW0x6p1H5lPr6TjWX8l3ePt8wMsJ9DljxUVh5O6AgVK3dIs5ebMwN8qC8RV V57frDTB4/trv3qAlUc9P4/4dOVqO+z/Cd23iyBh8qNs5FqcVS2l+PMgXyCrgHKPFipp6OCELOm hDSfPPStw/eT/EZMlwmt/SqDlH3Uz1XU9gpP1f+JlKJX6BGccTvqOLRlP0UmUB/B5XEZ9QiimNW b6h4wzaflfVNJRcXIBg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.20,FMLib:17.12.100.49 definitions=2026-01-26_04,2026-01-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 clxscore=1015 phishscore=0 impostorscore=0 suspectscore=0 spamscore=0 malwarescore=0 bulkscore=0 adultscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2601260202 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 --- Changes in v2: - Improved commit message of patch 0001 and 0003 with historical context on why EUD worked without PHY references on single-path systems. Expanded the usb-role-switch property description in the bindings file. - Link to v1: https://lore.kernel.org/all/20260116232106.2234978-1-elson.serrao@oss.qualcomm.com/ --- 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 | 100 +++-- 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, 477 insertions(+), 57 deletions(-) -- 2.34.1