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Wed, 21 Oct 2026 05:00:38 -0700 (PDT) Received: from [10.204.78.119] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ea3b486965sm10235045ad.63.2026.10.21.05.00.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 21 Oct 2026 05:00:37 -0700 (PDT) Message-ID: Date: Wed, 21 Oct 2026 17:30:27 +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> <425ddb41-cfd7-4032-8666-0193ab6b5819@oss.qualcomm.com> <565fd4c2-2d5a-4c2a-9ed1-c7bcb17efc9d@kernel.org> Content-Language: en-GB From: Nabige Aala In-Reply-To: <565fd4c2-2d5a-4c2a-9ed1-c7bcb17efc9d@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=S/NMU4sP c=1 sm=1 tr=0 ts=6ad8a967 cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=EUspDBNiAAAA:8 a=rLXGX9pe2IGxD4WxI2MA:9 a=QEXdDO2ut3YA:10 a=uG9DUKGECoFWVXl0Dc02:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDIxMDA0NyBTYWx0ZWRfX8CwiwWL9kAXo nI69d6NTMxqr8DIrAzJdyC7+l/pH7N3MaNf14rKhc1hKtPe123HM3VgwsKLlyvIcvrMwVaj3Z+t i8+aXVFXtLb9uFAcGtjQZvmcZ71WXJgOLVa198iHaRTOXUAjx4G1m7WqjSltOijIg8Vl8KCJRdZ xd0ZzEiwsN3E9BWh3MJEXF45wnK7ac+FB45fNoa0g3vO8M8K8pbpZ+EuVDH8l1TpykM/89cP9AY LkmHsFvbjboOvLAPRtnYnqgtGdx0xtCwzPeC4aDKJnbcOlRNLIEwyL0TDshEIcYJ0C0hgP5rNIR dQ1L+UIpYy70JYsiN+hpO9wqCdnupb11zN+WWeYEPmcElZHW6vL8yg9R0ZDMLECyJAp6VZYu0EB stD5U5qXFTjpYfU4NdWDSe10/S5JWVS6S6+/wb/ZY7Gv2/PE5aDHwqXDoyhFNPMn1vpZmIBCQTx ryHJDAxjFHdD6OPXhyw== X-Proofpoint-ORIG-GUID: oaF2-6WGJ3y0JsA6nB-KMwyTq4sOrYDy X-Proofpoint-Spam-Info: AW1haW4tMjYxMDIxMDA0NyBTYWx0ZWRfX+CJAO5c/NsZU ihf99yWkQi1dnYJXkfj8B1PGLnMUe66Oq1PsS6kg1GI5N12rr4M8TiCEjt7ZADodD4v3hkBcqsM 2/XR7e0ymMna61fzSt7pUkCQTEW1ve8= X-Proofpoint-GUID: oaF2-6WGJ3y0JsA6nB-KMwyTq4sOrYDy X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-21_03,2026-10-21_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 clxscore=1015 priorityscore=1501 spamscore=0 bulkscore=0 lowpriorityscore=0 malwarescore=0 phishscore=0 impostorscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610210047 On 10/21/2026 5:23 PM, Krzysztof Kozlowski wrote: > On 21/10/2026 13:16, Nabige Aala wrote: >> 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. > What are the differences? Only registers, so no pollution. You just need > them to match IDs. Yes, only registers are changed. Okay, I'll update the SA8775P descriptor table to also support Nord and drop the "qcom,nord-dp" compatible string change. > > Best regards, > Krzysztof