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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b94172ca2dfsm14401566b.36.2026.03.05.01.14.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 05 Mar 2026 01:14:07 -0800 (PST) Message-ID: <42a9dd4d-eb96-42c0-b836-dcd7cb9405ff@oss.qualcomm.com> Date: Thu, 5 Mar 2026 10:14:05 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/5] phy: qcom: qmp-pcie: Add PCIe Gen5 8-lane bifurcation support for Glymur To: Qiang Yu , Vinod Koul , Neil Armstrong , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Philipp Zabel , Bjorn Andersson , Konrad Dybcio Cc: linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260304-glymur_gen5x8_phy-v1-0-849e9a72e125@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260304-glymur_gen5x8_phy-v1-0-849e9a72e125@oss.qualcomm.com> X-Authority-Analysis: v=2.4 cv=I5Johdgg c=1 sm=1 tr=0 ts=69a94961 cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=MH3fQNhLqH5gLyV0EUgA:9 a=QEXdDO2ut3YA:10 a=IoWCM6iH3mJn3m4BftBB:22 X-Proofpoint-ORIG-GUID: Rr8FKM-hLOCFI07JQKA0qj61Evutu4RB X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzA1MDA3MyBTYWx0ZWRfXz88TglihS7Ng K7UrFUahLaHlgkvSv7crkcHkWma97BJT0EMf6BEgjjGFxfn7ny/8mUpoUYoKFVsMGHgXmMpledk 3FfzZ4J3/Cl6usw262BjThNgOE6QC5CDmca6biHEyDES8LECdv5MuYs5bmSgtJp8Od+YR+0jtWx BqOIQbn0AwQvcnsyoZTp9UNGe3w9QvLuchuNjR6WoCUMMFG50XaqjuNuxftFLO/pybfHEiI840J Ib5Ccxs6VJZOqkE5TBFFTkFsTF+qN+ksQVNakgrhrfZ3mSTjh4keoPLvYHBLfrC+Cj8Z1zlQcoI FKDJBgSKos2kmYZ8VUTTIfPfLd9gQoIyZ54k/foazLDjT6UZs3zMWNo4ynVho+tE5EMIQbMAbqg yTIu4EtBUXEFXZlJfSIJPmYnUfJb7tGFv7rhDZbvYy9m3MdyZ0y2Loa7VJQLaK4AKjAz3UyY7MW jWJKJrIHXEfdrvK9STA== X-Proofpoint-GUID: Rr8FKM-hLOCFI07JQKA0qj61Evutu4RB 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=2026-03-05_02,2026-03-04_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 priorityscore=1501 bulkscore=0 malwarescore=0 suspectscore=0 adultscore=0 clxscore=1015 impostorscore=0 spamscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603050073 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260305_011410_314982_1718556B X-CRM114-Status: GOOD ( 12.44 ) X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org On 3/4/26 9:21 AM, Qiang Yu wrote: > This patch series adds support for PCIe Gen5 8-lane bifurcation mode on > the Glymur SoC's third PCIe controller. In this configuration, pcie3a PHY > acts as leader and pcie3b PHY as follower to form a single 8-lane PCIe > Gen5 interface. > > To support 8-lanes mode, this patch series add multiple power domain and > multi nocsr reset infrastructure as the hardware programming guide > specifies a strict initialization sequence for bifurcation mode that > requires coordinated multi-PHY resource management: > > 1. Turn on both pcie3a_phy_gdsc and pcie3b_phy_gdsc power domains > 2. Assert both pcie3a and pcie3b nocsr resets, then deassert them together > 3. Enable all pcie3a PHY clocks and pcie3b PHY aux clock (bifur_aux) > 4. Poll for PHY ready status I think we never concluded the discussion where I suggested the bifurcated PHY may be better expressed as a single node with #phy-cells = <1>, removing the need for duplicated resource references Konrad -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy