From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BDA2F35201C for ; Tue, 11 Aug 2026 21:36:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786484176; cv=none; b=OqjK0efwFmjPxiCL2J1Pzqfftxd15yXbXBzNZQ0L63hpKnQsPs3lQyeQhmSG5Br+xIpj4Td2yjVYtPXqpxytArn3k7J63l1fbc7Vg82/akeervU7OfTsn3vM3li4JrJDzbfhImrVT7ZXpzN8kKMyCcjo5WaTK0fd8bUTM7l3/Uc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786484176; c=relaxed/simple; bh=3fBoY/gw7JMZOBQhzZTLCz+7QXmmworuPQ7CK4Xh6Js=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version:Content-Type; b=ujuu2CNx3xpKsSXB7knudmCumars+EdmdXb6/oo3VuDTkVGxVpDynimmsZP3RpPhliqZ/mWGcWCX8GYFxiWrlAY7CJvVp/4QikwY7e2zIyLtBKkYFLkD+3eG+6URg2NFqAtZuzRGv0K3sEAZzloMno1OAmxOsgDgrOUDsg22hhw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com; spf=pass smtp.mailfrom=oss.qualcomm.com; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b=Rhl9H2si; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=D628UeVz; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b="Rhl9H2si"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="D628UeVz" Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 67BLQHcV1520420 for ; Tue, 11 Aug 2026 21:36:13 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:message-id :mime-version:subject:to; s=qcppdkim1; bh=gJGCqas17nzmHYElMsAVn5 uGCMRCKkOk/uITSYbuvYM=; b=Rhl9H2siFHqURbuXRGoaxINcZysfgXz9ML7kwt 26+mPJZmsZDc8L7jrxF2WUQvKzh4tlmdMHegPH+MZ2IeWMBIqXtYMeLv3Yz/q4+j IjdOIydK4uy6/G7Ro+70Q6rHlBjwMA8dYLbObAhJLborjFH8XJwrOWbPr/d4azK9 2P8ys1pMklfdu0Gjre8pDXir1Gd1wcVy8/MxixpsORwRCA29D4QDfyw9KQMVWlJS q0hOUR0rfE54GYtPsraQWp27TYvhLo3l/r1Pz2Thnpr6zaNlAZkuDDRTa9xjGxQA 5wdJf9uKw2xdOARP9K+0tacjjioXR37PUYZ0qfKxVYJRCDmQ== Received: from mail-pj1-f72.google.com (mail-pj1-f72.google.com [209.85.216.72]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4g049mj60j-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Tue, 11 Aug 2026 21:36:13 +0000 (GMT) Received: by mail-pj1-f72.google.com with SMTP id 98e67ed59e1d1-38e11baa66eso367812a91.2 for ; Tue, 11 Aug 2026 14:36:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1786484173; x=1787088973; darn=vger.kernel.org; h=content-transfer-encoding:content-type:mime-version:message-id:date :subject:cc:to:from:from:to:cc:subject:date:message-id:reply-to :content-type; bh=gJGCqas17nzmHYElMsAVn5uGCMRCKkOk/uITSYbuvYM=; b=D628UeVzdj8wg3gACc3gNmH4llgr+aXsHRbQVGAl+93aFccavpKsa2gtO5CX/+x7FR P/JixBrOT7dg9ypCVrytIWwWfxUwak41AUx/nwxIwkT4CJZBLJGxypSaXxvP7/wMuTJi psCXkMbYMOS3NB3C2VB1Ln8tBZfPtLOO1doxhstGtGztfbmlYJTq5qff6zuwlUWB8WcW 90h6NdKDuHjFvRK2lTGYwWdWk84/j02oHZKOfzC51JAXi3gF1+ZHFZvgEDjuhx1L0aCG uvTcoyOfMBH0lt2TeEbT2zK40QehiOPeylCvR6e+osYFlMIngs6VikyhnRxCwxfLkyDM loXQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786484173; x=1787088973; h=content-transfer-encoding:content-type:mime-version:message-id:date :subject:cc:to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to:content-type; bh=gJGCqas17nzmHYElMsAVn5uGCMRCKkOk/uITSYbuvYM=; b=sD2Zs/GhbHDVyIKbh1SoW6onLUdYLMZdEzoB1tDn8tqENyToUkYixVF7K8SRgu+ROp t9EsaAqrA1s92Wnuuv6q5XR29rOQy09ihTBxCFQg3V7kCASoao56qP/EWN2sabeBiA4R sLqIlByh6/aOqKgU3R1uXDbsyyj3YuTPt0xDnd3PBVJAyob+D0NBriZSzcL9q+7JdGxO 3vKB/URXSX2KWS2uprO+NjklIfJzcf9dV8DHZJKmLfN3Hju0NwUj5XGpakqXpuXEKO3f ZFnFhcKFOIjHDEqW03+8na0xISG1nni/q9Qiesnwh/nrFdZ6YZ9FtxB1IWycKo7ZdV0m kdcw== X-Forwarded-Encrypted: i=1; AHgh+RoQGP9BnG/lQGA9iH72D8e1MzVAVGQGcC8O+2YX7uqn4u0oUxPSl5CMnBXI2pbj0ibHJondfk2LuzMW@vger.kernel.org X-Gm-Message-State: AOJu0YwRNvcpMrdk6Vn3cc3gQEhgUFDZiROJiNYnvO0BewYjL0gACRSD k3KRINH1IRQFdNYkjKWR21JlDohJcFzoZAyAjHfnIYpklCO3vSGX6a1kPkMRI/Em7jCYOU4a8Px ObYLuqIS0OHCYswUTuHMgDzmPBozRtroFbXRpzsvaBLYXw/OJRpi53qv/Ca0iTQYrN582ogm1 X-Gm-Gg: AR+sD1018apYuubMM5T3//e8qBDvesZDdI80fxp3xPLdnTxM1VC+ZScE/ZL68V0OH+W Nq3p+TIDZ/p4X09IREOPrE78msUF+cE4lATEQYJ5snJJjFpukR547i58BOA7SRZFRNv28c6Z+BD kAFUUA8PeyYmHXptxJ+teNeu6f1woTbx33EeFmiTZlyjPW7mb0Qy6hWPa32yKGKg4/6QXhgBE2c mEdynwlQyj/tNHoiQSeTnY855KgshaBUNnw3ZVz2JKEU4bPRS9/xdoawFpxCdqfmZiGq2Eb9bas ibJewrVN0NAuCdLT3zU6ZbE0Uog2Ld3A90h1Ep+5xgTwmB4x0G8VLTOYNYUUX29FhfOQ9IO9nry dO5uDDAlM9mkRrqEmxhtBdrJe98J7qtiQs9/luy42E5hJY2Dz0mv8Zw== X-Received: by 2002:a17:90b:2e4b:b0:380:f389:447b with SMTP id 98e67ed59e1d1-393014fe4f7mr9299a91.11.1786484172447; Tue, 11 Aug 2026 14:36:12 -0700 (PDT) X-Received: by 2002:a17:90b:2e4b:b0:380:f389:447b with SMTP id 98e67ed59e1d1-393014fe4f7mr9226a91.11.1786484171945; Tue, 11 Aug 2026 14:36:11 -0700 (PDT) Received: from hu-eserrao-lv.qualcomm.com (Global_NAT1.qualcomm.com. [129.46.96.20]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-31cf3c08163sm2713563eec.7.2026.08.11.14.36.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Aug 2026 14:36:11 -0700 (PDT) From: Elson Serrao To: Bjorn Andersson , Dmitry Baryshkov , Greg Kroah-Hartman , Konrad Dybcio , Krzysztof Kozlowski , Peter Chen , Rob Herring , Conor Dooley Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v6 0/9] Improve Qualcomm EUD driver and platform support Date: Tue, 11 Aug 2026 14:36:01 -0700 Message-Id: <20260811213610.2956147-1-elson.serrao@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: devicetree@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: JFEB1cc7Rd4VFs6u3nAkvsI9YNYTjOdy X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODExMDE4MiBTYWx0ZWRfXxBEfY4mvhBMq mkldka9QUK187Bkxf70ID1vemInWXOxeLtxjImOx7EHHGLV6b9xrjWGVqUVz6ebFGR5nDGA3RbR l8wdqLKRWYjcgacXweqTmGGHUBlnl/5YWZcKNOW0qFdyVkha62XwZrm1OyANvpdFQ2nLFKRkpxx PwjjJFthMShkQxiHUHC2fW+GpXgSSY+IAGwS6bkBxmpUqSV+j5ueaaHVsD2qMcJ2NyJYhb6bDqQ pqc9j8sm/F4w2U+uSZ0cTcJE61uWSUK8HP6k58wVId8VM1Mq7z+J19Vp6mvydaWoHwEV/Tk3qze k4Zn/uFzGzBXgBd1LO+CcYkTQH1DN0KSGzmrmanQVDTEpWUewljPf+1lz6dx5ZfCHbDrgbf6xAL kipcNwCPLpaaeuSsJ1+vSsZoeWW4cArlJheajbORBdNn6ohBVPOtLFn37JfARoKLmtvnMokKcSh CRYphhgQaSoWQAZgs6w== X-Proofpoint-ORIG-GUID: JFEB1cc7Rd4VFs6u3nAkvsI9YNYTjOdy X-Authority-Analysis: v=2.4 cv=FbkHAp+6 c=1 sm=1 tr=0 ts=6a7b95cd cx=c_pps a=RP+M6JBNLl+fLTcSJhASfg==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=EUspDBNiAAAA:8 a=VwQbUJbxAAAA:8 a=eIg1vlXWje1Bm5DpEBAA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=iS9zxrgQBfv6-_F4QbHw:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwODExMDE4MiBTYWx0ZWRfXxHVpheBeHrht EQdxnSE1VH9XMKX+B08tnawq+MQ9dZcsouIsGICI2XTrZJmvKIT3bx0O+yhTKRGXlcsoFXS4JNh gwtYkMg2/5FBxZ9n+MK+0WRCM5dNNOw= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-11_05,2026-08-10_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 phishscore=0 clxscore=1015 bulkscore=0 suspectscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 impostorscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608110182 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. Below is a high-level block diagram showing the EUD and its connections. EUD Block +------------------------------+ | | [Conn-0]-->[USB2PHY-0]---->|-------- Path 0 --------------|-->[USBCtrl-0] | | [Conn-1]-->[USB2PHY-1]---->|-------- Path 1 --------------|-->[USBCtrl-1] | | | +------------------+ | | | EUD Debug Hub | | | +------------------+ | +------------------------------+ 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 Testing feedback: - Konrad Dybcio reported running a slightly modified version of this series on Agatti with no obvious issues: https://lore.kernel.org/all/8d4f10ef-602c-4e1e-9711-443a5f3fa7f3@oss.qualcomm.com/ --- Changes in v6: - [Patch 0001] Fix oneOf schema to properly enforce mutual exclusivity between 'ports' and 'eud-path@N' (sashiko-bot). - [Patch 0009] Extend the eud_con remote-endpoint fix to sm7325-motorola-dubai-common.dtsi and sm7325-xiaomi-taoyao.dts to fix "not bidirectional" DT graph warning. - Link to v5: https://lore.kernel.org/all/20260803031534.2942628-1-elson.serrao@oss.qualcomm.com/ Changes in v5: - [Patch 0001] Add a compatible for a SoC that supports EUD over two ports, restrict paths based on SoC hardware, and improve the commit message [Krzysztof/Dmitry] - [Patch 0002/0003] Document error codes in ABI doc. - [Patch 0004] Zero-initialize the USB role switch descriptor [Peter]. Add a dr_mode check to handle cases where the USB controller operates in a fixed role without role-switch support (based on internal testing). - [Patch 0006] Drop eud_disabled_for_host flag and control EUD based on device role entry/exit [Peter]. Allow EUD to be powered on only in device role and defer enablement in other roles until the port switches to device role. - Link to v4: https://lore.kernel.org/all/20260501170635.2641748-1-elson.serrao@oss.qualcomm.com/ Changes in v4: - [Patch 0001] Restructure the flattened ports representation to a child-node based model. - Preserve the top-level 'ports' property and add per-path child nodes, so that each role-switch path is described using its own OF graph. (Dmitry). - Link to the discussion leading to this design decision: https://lore.kernel.org/all/20260324172916.804229-1-elson.serrao@oss.qualcomm.com/ - [Patch 0002] Use explicit port names when selecting the active EUD port (Greg) - [Patch 0003] Use a scoped iterator when looping over child nodes and drop redundant EUD path validation checks (Konrad). Preserve support for the legacy top-level ports description. - [Patch 0004] Register role switch per path and forward the role switch notifications to the USB controller. - [Patch 0006] Add host mode co-ordination based on the role changes as per the new design and drop the custom API that was used to get role notifications. - [Patch 0008] Described the UTMI path as a child node with role switch capability. - Link to v3: https://lore.kernel.org/all/20260309203337.803986-1-elson.serrao@oss.qualcomm.com/ Changes in RFC v3: - Replaced the per-path (eud-path@N) model with a flattened ports representation based on the feedback. - Added port@2 and port@3 to support dual-port configurations. - Removed the EUD-local 'phys' and 'usb-role-switch' properties since PHY and role-switch information is obtained from walking the OF graph. - Updated PHY discovery logic by fetching the PHY from the controller node/fwnode, and exported a new API for the controller to report role changes. The dwc3-qcom driver now uses this API to notify EUD on role transitions. - Updated the DTS structure by moving the EUD-to-controller port mapping into the base SoC DTSI, enabling EUD by default, and adjusting all board DTS files accordingly, including adding the usb-role-switch provider link on connector nodes. - Link to v2: https://lore.kernel.org/all/20260126233830.2193816-1-elson.serrao@oss.qualcomm.com/ 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: Add per-path child nodes for UTMI routing 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 role-based EUD control usb: misc: qcom_eud: fix virtual attach/detach event handling arm64: dts: qcom: kodiak: Describe EUD UTMI path using child node arm64: dts: qcom: Map USB connector to EUD on Kodiak boards Documentation/ABI/testing/sysfs-driver-eud | 19 + .../bindings/soc/qcom/qcom,eud.yaml | 133 ++++++- arch/arm64/boot/dts/qcom/kodiak.dtsi | 35 +- .../boot/dts/qcom/qcm6490-fairphone-fp5.dts | 10 +- .../dts/qcom/qcm6490-particle-tachyon.dts | 10 +- .../boot/dts/qcom/qcm6490-shift-otter.dts | 10 +- arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 10 +- .../qcom/qcs6490-thundercomm-minipc-g1iot.dts | 4 +- .../dts/qcom/qcs6490-thundercomm-rubikpi3.dts | 10 +- .../qcom/sm7325-motorola-dubai-common.dtsi | 4 +- .../boot/dts/qcom/sm7325-motorola-dubai.dts | 4 +- .../boot/dts/qcom/sm7325-nothing-spacewar.dts | 10 +- .../boot/dts/qcom/sm7325-xiaomi-taoyao.dts | 4 +- drivers/usb/misc/qcom_eud.c | 332 ++++++++++++++++-- 14 files changed, 522 insertions(+), 73 deletions(-) -- 2.34.1