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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-usb@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-Proofpoint-Spam-Info: AW1haW4tMjYwODE4MDA2NiBTYWx0ZWRfX4WNYrbIuOlGl GsbzhGiJWPXbVxh4iX8YngmfeUINmAzo1RmUdDuNzEEhw9jd9Uo1Zz78luv303JLF+l8o8e+LMp PcNUU+uU8xeo4lj2M5ipilTIxHIg8EI= X-Proofpoint-ORIG-GUID: wTCodfAsh4BJPX5KuMezcjT4rgLW-Y4u X-Authority-Analysis: v=2.4 cv=UfFhjqSN c=1 sm=1 tr=0 ts=6a8420ab cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==: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=LTL54F7UJFTHhO7zyW4A:9 a=QEXdDO2ut3YA:10 a=IoWCM6iH3mJn3m4BftBB:22 X-Proofpoint-GUID: wTCodfAsh4BJPX5KuMezcjT4rgLW-Y4u X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE4MDA2NiBTYWx0ZWRfX3NZnJmkX8jA+ mFc5X3OTxyoE+sOY52JC6jZGrpYuHE1fMh5WKsoL1cuO8FKwiFZBE+ri/t24FFKdurrhmt/izZQ iALO38q1J8SmvrnVQn7mpQMNfC3TlIbjm52k3B/J3gA+gC5oW1x23GA17wuwq5qAmrPnHmKGb43 nB50OKqrwo1CFiSEhaUNmfB76YXFVycWZ2maXMZzTkg34M3veQgP1UlaT63uhz5jguaSJKKZS+G Sln90lv3dryiBA/SNh+LDfe/akq7z4yVegrN+0/pH0VBPAnEosMX2BzJfnR3PVsm7uR05L8ECTF Fncy3tzCjdOFg9qmMEy9w17sovSQo6wVCB2fxSrJxp1VGRqwHX3KlkfbzaOJUyp/lbqXSRP0Wr+ fVqjM2u2qEvcUy4nyDgiidCR4KnFfvovmo41TPMVesHM5gNmR9itfUc9uyWQSQ7ukp6qh0B7xlM 1/WDpszioj73SKjUxag== 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 bulkscore=0 malwarescore=0 impostorscore=0 suspectscore=0 adultscore=0 spamscore=0 priorityscore=1501 clxscore=1015 phishscore=0 lowpriorityscore=0 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