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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84edbe565d2sm4920387b3a.13.2026.08.04.00.04.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 04 Aug 2026 00:05:02 -0700 (PDT) Message-ID: <58940156-c664-4ab2-835c-81fa43365bcd@oss.qualcomm.com> Date: Tue, 4 Aug 2026 15:04:58 +0800 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 v2] arm64: dts: qcom: hamoa-iot-evk: switch typec0 to PS8830 retimer To: Dmitry Baryshkov Cc: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, tingwei.zhang@oss.qualcomm.com, jie.gan@oss.qualcomm.com, Guodong Xu References: <20260803132753.994619-1-xin.liu@oss.qualcomm.com> From: Xin Liu In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Info: AW1haW4tMjYwODA0MDA1NCBTYWx0ZWRfX6VyORojyTeix JRrfafVbvgS3YtgYTjylL1XMU2ip3HcGY4pJtZprBbFjjSi8bXvGqlIATwQVSbxnZkPMNQw3Yf7 BZSRzsVY67bclfBmHQAWa2ZEgEUn1c8= X-Proofpoint-GUID: zbwq7CCF3yrhxgryEo9FrndC90-WOVUh X-Proofpoint-ORIG-GUID: zbwq7CCF3yrhxgryEo9FrndC90-WOVUh X-Authority-Analysis: v=2.4 cv=EoniaycA c=1 sm=1 tr=0 ts=6a718f20 cx=c_pps a=m5Vt/hrsBiPMCU0y4gIsQw==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=EUspDBNiAAAA:8 a=nF2vwnYNiXGi8mvl9yQA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=IoOABgeZipijB_acs4fv:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODA0MDA1NCBTYWx0ZWRfX1EPZTm5rrDIQ h3scUbfoP52Bhkw4zBbIibp9G+Yx3oX9admUVDciY6pOjf0KPcW+b0Bsy21KVtAMzSEmksS0+fO IzHneaLK6SgOOQsdR1KrVsNQB1dpwptUw1TFArpxILyxyidx9N3hUlgqQdSJVdWwIdYd8Uagd+y jfBOd3YB+GEdnzPjnWzL3WOLlVNDIRp7QNf9HuTv717zFy4pGEBN1MWvnPd+MHJ9jkGXPxpSS9B trapwivSX3aQUd2HYiuw3hTzI9NIavreW89oPuNJP3u+6wngujAPH//qaDplmOU5SCaTDa717Zc 8Azxi1chSQBv3PHFMAKTP+dG1tWyFC2otO01uyGrI/pwsqiMgtDTAFtnZMQgUmrPhw27QPrhsgr Y9MUEq+3nUpjGX5UUgMOENNAAR8RXN+AETPrzS8Lm7gU4Yp5azsWALLUMdnsyhYZMWEpOXCBumN jSmoQZgikMW2hfCG1bg== 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=2026-08-04_01,2026-08-03_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 adultscore=0 phishscore=0 malwarescore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 suspectscore=0 spamscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608040054 On 8/4/2026 3:35 AM, Dmitry Baryshkov wrote: > On Mon, Aug 03, 2026 at 06:27:47AM -0700, Xin Liu wrote: >> The Hamoa IoT EVK hardware design uses a Parade PS8830 retimer on >> I2C3 for USB Type-C port 0. Describe the retimer and route typec0 >> through it to enable USB 3.0 SuperSpeed and DisplayPort Alt Mode. >> >> Supply the PS8830 from the existing vreg_rtmr0_* rails and remove >> their stale "Left unused" annotation. >> >> The FSUSB42 SBU mux chip is present on the PCB but with all signal >> lines unconnected (NC), so remove the fsusb42 node and its pinctrl >> group. > Why is it still present on the PCB? The FSUSB42 is retained on the PCB as a fallback for the PS8830's SBU mux function. Should the PS8830's SBU path encounter any issues, the FSUSB42 can be activated with a simple rework to quickly switch to a discrete solution, avoiding a full board respin. Thanks, Xin >> Tested on the Hamoa IoT EVK: >> >> USB 3.0 SuperSpeed at 5 Gbps on typec0 >> DisplayPort Alt Mode on typec0 >> >> Signed-off-by: Guodong Xu >> Signed-off-by: Xin Liu > Reviewed-by: Dmitry Baryshkov > >