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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3a853e66560sm9393796a91.6.2026.10.07.03.44.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 07 Oct 2026 03:44:05 -0700 (PDT) Message-ID: <4318b36a-8fee-4207-a232-0581e2b2c69b@oss.qualcomm.com> Date: Wed, 7 Oct 2026 16:14:00 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 0/8] Improve Qualcomm EUD driver and platform support To: Elson Serrao , Bjorn Andersson , Conor Dooley , Greg Kroah-Hartman , Konrad Dybcio , Krzysztof Kozlowski , Rob Herring Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260929213513.2401005-1-elson.serrao@oss.qualcomm.com> Content-Language: en-US From: Gopikrishna Garmidi In-Reply-To: <20260929213513.2401005-1-elson.serrao@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=W66txhWk c=1 sm=1 tr=0 ts=6ac62277 cx=c_pps a=RP+M6JBNLl+fLTcSJhASfg==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=EUspDBNiAAAA:8 a=IB2eJBZJimwe791p62gA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=iS9zxrgQBfv6-_F4QbHw:22 X-Proofpoint-ORIG-GUID: jpg5iHEXZ1Wplx-OvgmxGURYm8hJ6wxI X-Proofpoint-GUID: jpg5iHEXZ1Wplx-OvgmxGURYm8hJ6wxI X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDA3MDA0MiBTYWx0ZWRfX7ivaOZ/swYmO icUwtL0Oo2Rmb/PxqPXjo67rNMYKPvaerCaJnjeSMlZO1ktvQJGLd56qXJaLCI0EsEB8bXqrU2V /WIda0CJ/qLD4jEx0Bpqj4XDpI11Mthkxa4x2BF3/nhWADr4lvr9ycK5gp31hafQzqPydxiJ3du HiOXT679RYRgF+7sJzfbnE+cIVO5ztZ9odlDZRL9sYnWZAbiAgV/8EMcgJ7m2CV9T9GGLmmmgDf IwHtDDxRc5Wrk52j/bYcYEQqShVQ3X08hwE80LV1A6KrRhTynVa1G2IgxSCGQh+TPbul8v1a+kF midJMTNxCx8yC6NhSSmYUWVlpVt0m+5JGOOVI6jtxEYPRIuSFt6ycyTix04GVA840io/Zrafqfb 7d3/RHKMqy92f0eUhzLo8QjTxs10KM7GP4yHTBLF7NX4tkb/aefoI5u76ItOyyq4V2v4EJ/HbRA bIlbRpKZTwmkcUue77w== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDA3MDA0MiBTYWx0ZWRfX+XxQTF2IOlpq LWLyIeYq0qFGlocDgJzdH488YA2ZSCdkM8v7z79owXUWeptUDnGQ4uUW9lUkDXGFpV6XO83k5VI iiU/W7rJ+Hrs/OzfWWQKan4AQ2xEx/g= 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=2026-10-07_03,2026-10-06_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 phishscore=0 spamscore=0 bulkscore=0 clxscore=1015 malwarescore=0 impostorscore=0 suspectscore=0 priorityscore=1501 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2610070042 On 9/30/2026 3:05 AM, Elson Serrao wrote: > 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 > > Tested patches 2-7 on Glymur-CRD, EUD port selection and role switching work as expected. Patch 8 (Kodiak DT) not tested. Tested-by: Gopikrishna Garmidi