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Wed, 11 Mar 2026 22:09:01 -0700 (PDT) X-Received: by 2002:a17:90a:e7d2:b0:359:f43d:4a78 with SMTP id 98e67ed59e1d1-35a01284a88mr4358138a91.20.1773292140887; Wed, 11 Mar 2026 22:09:00 -0700 (PDT) Received: from [10.231.216.91] ([114.94.8.21]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-35a00332df4sm2306112a91.1.2026.03.11.22.08.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Mar 2026 22:09:00 -0700 (PDT) Message-ID: Date: Thu, 12 Mar 2026 13:08:56 +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 From: Hangtian Zhu Subject: Re: [PATCH v2] arm64: dts: qcom: qcs6490-rb3gen2-industrial-mezzanine: disable WCN6750 and WPSS To: Dmitry Baryshkov Cc: andersson@kernel.org, konradybcio@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260311023219.2284643-1-hangtian.zhu@oss.qualcomm.com> <20260311031145.2285056-1-hangtian.zhu@oss.qualcomm.com> <7aff8a49-ac47-4d93-8028-2710ba4eb2d7@oss.qualcomm.com> Content-Language: en-GB In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-ORIG-GUID: vbuUqdLqdXzOJcIWEuis3S6kVuLPGsU5 X-Authority-Analysis: v=2.4 cv=CIUnnBrD c=1 sm=1 tr=0 ts=69b24a6e cx=c_pps a=RP+M6JBNLl+fLTcSJhASfg==:117 a=Uz3yg00KUFJ2y2WijEJ4bw==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=wsJMvZlqpbo_sQjfH0EA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=iS9zxrgQBfv6-_F4QbHw:22 X-Proofpoint-GUID: vbuUqdLqdXzOJcIWEuis3S6kVuLPGsU5 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzEyMDAzOCBTYWx0ZWRfX7bQ1PgDo6okr fRVAnMrVMjgzbsRaZvpTBIp7w/mEAI+wwoD5yIQJS2q5PXGedM6TFrTXwOsybBAxC3OLCoCOSKA O4azT2EpPw+KtbrX1PvYr7S4DPa9dHakh9xJHPjnVDb+pxVsvW0a9osHDNgOdAKS149UPBLp4Ic bdUsxqYO0xYZw7XIOtfb1ttar+9i6SW9bN8MocDhE54AZGKjeX87QKj9V68+2cfB5NdV88kyuw2 dq6GqrTz30R85c/K2Y3QZgXXFlPuScZMdkFpv/Tz07+tXGNxkJWD68wQrtEyXCEujLDgOMIrzbQ m8hWpFZxlqmF0FLdVPyzRhN44rtVVyWHP2BOkWLK619npJoXjzCb6CWCQEEP44uIe8Wxdz5cG1m J1uDdNRLCl4LgyRZ4lEic7Ew0Oj+HYgDSuB5unWh/JlUpRPTgJLGWMKvOGckcMdiNJctrqFvd+r wBiYP1W+ZlqhP3cFLdA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-11_02,2026-03-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 spamscore=0 lowpriorityscore=0 adultscore=0 priorityscore=1501 bulkscore=0 clxscore=1015 suspectscore=0 impostorscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603120038 On 3/12/2026 11:04, Dmitry Baryshkov wrote: > On Wed, Mar 11, 2026 at 03:06:08PM +0800, Hangtian Zhu wrote: >> >> >> On 3/11/2026 12:34, Dmitry Baryshkov wrote: >>> On Wed, Mar 11, 2026 at 11:11:45AM +0800, Hangtian Zhu wrote: >>>> From: Hangtian Zhu >>>> >>>> Disable WCN6750 and WPSS on industrial mezzanine. On RB3 Gen2 industrial >>> >>> You can't disable these devices on the mezzanine, they are not a part of >>> it. >>> >>>> mezzanine platform, pcie0 lines are moved from WCN6750 to QPS615 pcie >>> >>> PCIe0. How re they moved? What triggers the move? >> Please refer to: https://lore.kernel.org/all/20260305-industrial-mezzanine-pcie-v4-0-1f2c9d1344d7@oss.qualcomm.com/ >> On RB3 Gen2 industrial mezzanine, WCN6750 is not connected, instead TC9563 PCIe bridge is connected to PCIe0. > > THis doesn't answer the question, what triggers the move? Is it done > automatically? Is there a pin that is sourced by the carrier board? > Is there something else? It's the hardware design itself. Industrial mezzanine (should be called 'kit') is not a plugin device on top of core kit, but a non‑modular integrated device. Hardware redesigned QCS6490 SOM and disconnected WCN6750 from PCIe0 for this device, PCIe0 connects TC9563 PCIe bridge. > >> >>> >>>> bridge. Hence disable WPSS and WCN6750 nodes for industrial mezzanine >>>> platform. >>>> >>>> Depends-on: https://lore.kernel.org/all/20260305-industrial-mezzanine-pcie-v4-2-1f2c9d1344d7@oss.qualcomm.com/ >>> >>> NAK. Don't invent non-standard tags. >>> >>>> >>>> Signed-off-by: Hangtian Zhu >>>> --- >>>> .../dts/qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso | 8 ++++++++ >>>> 1 file changed, 8 insertions(+) >>>> >>> >> >