linux-kernel - Re: [PATCH v2] arm64: dts: qcom: hamoa-iot-evk: Add backlight support for eDP panel

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Message-ID: <09160a81-0a2d-4e9c-8710-3c172e07284a@oss.qualcomm.com>
Date: Fri, 7 Nov 2025 10:35:52 +0800
From: Yongxing Mou <yongxing.mou@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: qcom: hamoa-iot-evk: Add backlight support
 for eDP panel



On 11/6/2025 6:15 PM, Konrad Dybcio wrote:
> 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
> 
That's great. Thanks for your comments and suggestions. Will update the 
commit message next version.