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Tue, 18 Aug 2026 02:06:50 -0700 (PDT) X-Received: by 2002:a05:620a:6910:b0:936:2f59:dfe4 with SMTP id af79cd13be357-936d1edd4fdmr2349730885a.0.1787044010319; Tue, 18 Aug 2026 02:06:50 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c217fed68f9sm155764166b.27.2026.08.18.02.06.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Aug 2026 02:06:49 -0700 (PDT) Message-ID: Date: Tue, 18 Aug 2026 11:06:47 +0200 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 10/10] ARM: dts: qcom: apq8074-dragonboard: enable the USB3 host To: Dmitry Baryshkov , Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Wesley Cheng , Vinod Koul , Neil Armstrong , Christian Marangi , Andy Gross , Bjorn Andersson , Konrad Dybcio Cc: linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org References: <20260810-msm8974-usb3-v1-0-1a47e1185524@oss.qualcomm.com> <20260810-msm8974-usb3-v1-10-1a47e1185524@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260810-msm8974-usb3-v1-10-1a47e1185524@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=S+/pBosP c=1 sm=1 tr=0 ts=6a8420ab cx=c_pps a=hnmNkyzTK/kJ09Xio7VxxA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=EUspDBNiAAAA:8 a=LTL54F7UJFTHhO7zyW4A:9 a=QEXdDO2ut3YA:10 a=PEH46H7Ffwr30OY-TuGO:22 X-Proofpoint-GUID: iGNEyrkqdCWE8VA8VB_fsBSU70oL6SyG X-Proofpoint-ORIG-GUID: iGNEyrkqdCWE8VA8VB_fsBSU70oL6SyG X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE4MDA2NiBTYWx0ZWRfXxGDw4yWc2xc5 sGMR9nEZdk2OkRnjKpbf3jMrK63B35xj1KBXBdM9TWioWEG5rnGcNVo3XoQCl3BkpCABP+aB9AK FemTZ2xTmS4d1BNXqdYS0aLUPcP5zXUK7mzco/c/D2QvxxxJ0MLC61w2uasIcLIlj5G6RVi7+Ui nOG77epmb5e2o9G/xAsVENB5lF6TcNukqpNDITEH6A4TKnRHwY8Vdvtq+vLCEHN/kvIulRN/RUf wAOjBhTPg4V2P7ZmG2S6fx3jk9Qpoh2HgC1xD6WA9q9IZ/s2G+s2vQ9ADQ/UMWTel3dwzobseB/ rFGrBImWx9Gm/SV7AWkPecTtmHihi1nrV6n+ohM+g7sIRCN7myULhCob8I90uHZjMmNGl6awcvV pbc/brX3vhJmOC2CLzeC9Oh7M60CriVSCAJgjeN7iELlJxoNZDkIEJSYksDrEroIzT7ePQLgw9L Q8zqPM2kPYlorajPDow== X-Proofpoint-Spam-Info: AW1haW4tMjYwODE4MDA2NiBTYWx0ZWRfXyVXClcbIh/sh Zpq8+JbYxxqtW1IUjr3zfJy/Kz1vTgg1bjYfySj6pP7T63/zMGBRfuIcsZpk0tR+CfvVGjgNraQ me3pCSeqfP7bV19sWcH8MGiT1SDo4aM= 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=2026-08-17_04,2026-08-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 malwarescore=0 spamscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 impostorscore=0 adultscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608180066 On 8/10/26 1:42 PM, Dmitry Baryshkov wrote: > The USB3 port of the dragonboard drives the onboard TUSB8040A hub with > the AX88179 GbE controller and the PL2775 USB-SATA bridge behind it, > but the controller is disabled and nothing describes the devices, so > their reset lines float and their supplies are unmanaged. > > Enable the DWC3 controller in host mode together with both of its > PHYs, and describe the onboard chain as device nodes under the > controller: the TUSB8040A hub pair (with the EEPROM-programmed > 0451:8041/0451:8043 IDs this board reports), the AX88179 on the DN2 > port and the PL2775 on the DN0 port, each with its PM8941 reset GPIO, > all powered from the always-on 3.3V carrier board rail, modeled as a > fixed regulator. > > The SuperSpeed PHY is required even for the hub's USB 2.0 half to > respond: with the SS PHY left uninitialized the hub connects but never > answers enumeration at any speed. > > Assisted-by: Claude:claude-fable-5 > Signed-off-by: Dmitry Baryshkov > --- Reviewed-by: Konrad Dybcio Konrad