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Wed, 21 Oct 2026 04:16:27 -0700 (PDT) Received: from [10.204.78.119] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3ad80912f26sm3948228a91.1.2026.10.21.04.16.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 21 Oct 2026 04:16:26 -0700 (PDT) Message-ID: <425ddb41-cfd7-4032-8666-0193ab6b5819@oss.qualcomm.com> Date: Wed, 21 Oct 2026 16:46:17 +0530 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 02/13] dt-bindings: display: msm: Document the Nord DiplayPort controller To: Krzysztof Kozlowski Cc: Vinod Koul , Neil Armstrong , Manivannan Sadhasivam , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Kuogee Hsieh , Shawn Guo , linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, Ritesh Kumar , Mahadevan P References: <20261012-nord-drv-dt-v2-0-a2ab9af954d2@oss.qualcomm.com> <20261012-nord-drv-dt-v2-2-a2ab9af954d2@oss.qualcomm.com> <20261013-tangible-wakeful-swift-a38f8f@quoll> <20261013-honored-bear-of-cleaning-bd8108@quoll> Content-Language: en-GB From: Nabige Aala In-Reply-To: <20261013-honored-bear-of-cleaning-bd8108@quoll> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=d4JgWhjE c=1 sm=1 tr=0 ts=6ad89f0c cx=c_pps a=vVfyC5vLCtgYJKYeQD43oA==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=EUspDBNiAAAA:8 a=D6Kic2Gw2dsiznywmRUA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=rl5im9kqc5Lf4LNbBjHf:22 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDIxMDA0NCBTYWx0ZWRfX1HENsCxVJ2Gy f0LtFiM/GsO2eT9OBJXWIw7W9k0TvFjy1Q4xEji1B+4rUg9pHMezQsVOIDUNGmWlTnFvNq2dgvc fULpEW3nqUHqPVQ7xUvxPnM5EJYZ1n8= X-Proofpoint-GUID: aJRiFHN4QKN-KZLKe541E2_JnkNwWrkg X-Proofpoint-ORIG-GUID: aJRiFHN4QKN-KZLKe541E2_JnkNwWrkg X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDIxMDA0NCBTYWx0ZWRfX+xQJgT3MlaUm +tOTOk+u8/4gn2DCdZGb40X89Dxhmeai1Ez3ANKYwz0yfkgO+BrhO+Cak+mZXkatSqzNzrDl2xk GRBOii4EQi2NrD+wkPyNIeUZjaFscMGLdh9wwltZTQytOIHtEeTgjSLiyDiKqsgctVmBgEBN06W 8pOvs2MXUNagEZBqwPx8WTW6GShLzYfZZT9LYHf+3It4q1UMv8REVxNSjXA3rM9p0pIiI1zivU5 5wnUvMAEu0NxIDINUkR28JKZdjMLzue3bTIbw+cZp4YCQr9wpTYRQR06qbFdbb9tKgVsZczSSyw hvkHQ5JYRybD5C/ybHlpo/bHbgNnx4MtyJ+0j46cbgU1bKyAlg8UdwSFVDAg/7fk+9x6JX+wC+u Lq0whr68+qufa+8xARhTPv53cC++heq7BA4sTQ62n9mDydpLZmV1WMcRa67iVVZDJTpYICZnysd SR8hR/xLKUWWmDihhWg== 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=2026-10-21_03,2026-10-19_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 suspectscore=0 spamscore=0 malwarescore=0 priorityscore=1501 adultscore=0 impostorscore=0 bulkscore=0 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610210044 On 10/13/2026 2:18 PM, Krzysztof Kozlowski wrote: > On Tue, Oct 13, 2026 at 09:44:15AM +0200, Krzysztof Kozlowski wrote: >> On Mon, Oct 12, 2026 at 07:02:12PM +0530, Nabige Aala wrote: >>> From: Mahadevan P >>> >>> Nord uses MDSS 12.1 with two independent DP controller instances, >>> each exposing two DP cores at new IO offsets. None of the existing >>> compatibles match this layout, so add qcom,nord-dp. >>> >>> Signed-off-by: Mahadevan P >>> Signed-off-by: Nabige Aala >> Do I understand correctly: >> Device is fully compatible with qcom,sa8775p-dp, but a simple to fix >> driver limitation is preventing compatibility? >> >> If so, let's fix the driver - just add more addresses to the >> msm_dp_desc_sa8775p array? > Or it does not matter, because top-level MDSS anyway cannot use > compatibility? For MDSS0, the DP register offsets are same to those used on SA8775P. However, the MDSS1 DP register offsets differ from SA8775P, and Nord also utilizes a different MDSS instance. Because of these differences, we introduced a separate compatible string for Nord. Are you suggesting that Nord should reuse the "msm_dp_desc_sa8775p"?  This would also pollute the sa8775p's desc table. From your perspective, what would be the preferred approach here? > > Best regards, > Krzysztof