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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-369f4164886sm29475546eec.7.2026.10.27.11.18.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Oct 2026 11:18:56 -0700 (PDT) Date: Tue, 27 Oct 2026 23:48:49 +0530 From: Vishnu Saini To: Krzysztof Kozlowski Cc: Neil Armstrong , Jessica Zhang , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Arpit Saini , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, venkata.valluru@oss.qualcomm.com Subject: Re: [PATCH] dt-bindings: display: panel: ilitek,ili7807s: Allow backlight property Message-ID: References: <20261025-dlc_backlight-v1-1-1d1c49c3e101@oss.qualcomm.com> <20261027-fantastic-benevolent-boobook-272a9a@quoll> 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 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI3MDA3MiBTYWx0ZWRfXz5r3WJ77zyi9 KBAERyVC4vTgoW1/ukxZwMKRMyfh5+fNk750VWt45wu5MsNXa+sVbY72rIzXhhKfzWrm+Ep/wsL VAw7Ewo/5WBYW7FiYQhj5cqH81rTBu1jg+iP9n4dpSXHph6l1+1HylfbljLkJBG7Ay8RS95Nrsg 3mYu3g2BF16g9sR2NttOoZD7HKbrJ9LSGtFjufxmaOA4BF1nmBkXw6GVEn1K6eI+j+rFY2Bqjr3 N2RS6IhtWAEUs+AwS4SHiWUoRVO+Po9EHOpRQyBH8lk8p2oJc4OsZ2PnzJL86Z6m69QgJ3b9pmW IShf0P7BsQ2SOPMAaEGO/VM2PWSa6ykExQIAohVqEltUuLseOoYHgbGS9R67iZwn3QFch25MD4F IIDzjwplrPqSvsZf1VZi2tqjb3SnfI/5oXd3GjDixnYjjHkR9ANlYqHdEi7b+aCGXjtVs3LgZp6 quyV/MtZnK+uWj7Xm7Q== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDI3MDA3MiBTYWx0ZWRfX9Sf+BurU7hUB iGibKgjwsviuzEypGEq2Ic2Vf4Z45m9/UlyOqtiZ+pyhT4mhYePy8nuOL6x6MPN3pbM25B2+LD9 Qn7B2/zazAF/wYintqpefhLBHoizafU= X-Authority-Analysis: v=2.4 cv=JspkP84C c=1 sm=1 tr=0 ts=6ae0eb12 cx=c_pps a=Uww141gWH0fZj/3QKPojxA==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=kj9zAlcOel0A:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=7rEk3nLCdkWhF05BNvEA:9 a=CjuIK1q_8ugA:10 a=PxkB5W3o20Ba91AHUih5:22 X-Proofpoint-GUID: dZ3dQEf9pSr9m_2YY-nSCdpSywWfgs5e X-Proofpoint-ORIG-GUID: dZ3dQEf9pSr9m_2YY-nSCdpSywWfgs5e 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=2026-10-27_05,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 adultscore=0 lowpriorityscore=0 clxscore=1015 spamscore=0 priorityscore=1501 impostorscore=0 bulkscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610270072 On Tue, Oct 27, 2026 at 03:34:19PM +0100, Krzysztof Kozlowski wrote: > On 27/10/2026 11:57, Vishnu Saini wrote: > > On Tue, Oct 27, 2026 at 09:12:27AM +0100, Krzysztof Kozlowski wrote: > >> On Sun, Oct 25, 2026 at 12:18:17PM +0530, Vishnu Saini wrote: > >>> The DLC0697 panel is lit by a separate backlight device, which is > >>> referenced from the panel node through the common 'backlight' > >>> property. > >>> > >>> Declare 'backlight: true' so the property is explicitly allowed by the > >>> schema. > >> > >> Why do you need to explicitly allow it? Since when? > >> > >> I see no benefit of this patch and commit msg does not explain me what > >> that benefit would be. > > It is required for below DLC panel, when enabling backlight using gpio-backlight driver, > > How is it required? You did not really answer, so again: > > Why do you need to explicitly allow it? > > Answer starts "because ... " and you provide technical arguments, not > wishes. Because the DLC panel node references an external gpio-backlight device through the backlight property, but the current DLC binding does not allow this property. As a result, adding the backlight phandle to the panel node causes a dtbs_check validation error. Adding backlight: true to the binding allows the common panel backlight property used by this DT. I will improve the commit message. > > Best regards, > Krzysztof