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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b7289682128sm177009466b.50.2025.11.06.02.15.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 06 Nov 2025 02:15:47 -0800 (PST) Message-ID: <29ef2def-4073-4a77-8437-41cdfac2fa9d@oss.qualcomm.com> Date: Thu, 6 Nov 2025 11:15:45 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] arm64: dts: qcom: hamoa-iot-evk: Add backlight support for eDP panel To: Yongxing Mou , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20251106-hamoa_dvt_backlight-v2-1-9f844c8f8110@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20251106-hamoa_dvt_backlight-v2-1-9f844c8f8110@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=R5UO2NRX c=1 sm=1 tr=0 ts=690c7555 cx=c_pps a=WeENfcodrlLV9YRTxbY/uA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=nQNFA-VO8Zg1hjSIiBcA:9 a=QEXdDO2ut3YA:10 a=kacYvNCVWA4VmyqE58fU:22 X-Proofpoint-ORIG-GUID: r5T1qYJ6uWzwjKFJrV3sJCN0Vtl4Vf_J X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA2MDA3OSBTYWx0ZWRfXwnw8SogMa33c DRB6YlO+tiXVox2PkMA85+FSywRL5OZh3E7WeBfOvEzoXgHAQQzZt5BidNtQw3LT4Q3TgXonIsi nrsshO/u/oW1DkuCDXBHsx9wwnHXJ8YS+sAMVH3wtEHZ1FIrtctir52OE3xYqjBIMm3n38JmcV5 Yf4fc/R4Lqd6yiRDy+4zC2p0GHNexfY3AaNNIuI3zuq/Y469xgRooX0dMmL692+aCMyHVMMJDRT 4ft20tCZWK/nA9V4tcXcNV/K+Zm3UFK/anKbjsrpDuAR7gdPr/jSSHWTsyvxZ2TnWoRe1TFZeW/ euo9x+2iaCDWnAFgcQUJs/WlAfJhwaFBYyBoiEF6LJlgVtOyufd5cEY4B8JD5iJeF63leG8bDjf aHB2abQn8KBJqwYouu5cbBbUvc7OUA== X-Proofpoint-GUID: r5T1qYJ6uWzwjKFJrV3sJCN0Vtl4Vf_J X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-06_02,2025-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 phishscore=0 adultscore=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511060079 On 11/6/25 8:12 AM, Yongxing Mou wrote: > Previously, the eDP panel backlight was enabled via UEFI. Added backlight > control node in kernel DTS due to some meta may not enable the backlight. Adding the hardware description to the DT with the reason that some prior boot stage might not have taken care of it is not great How about: The backlight on the Hamoa IoT EVK is controlled through a PWM signal. Aligned with other x1e80100-based platforms: the PWM signal is controlled by PMK8550, and the backlight enable signal is handled by PMC8380. Describe the backlight device and connect it to the eDP panel to allow for brightness control Konrad