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

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Message-ID: <2364b381-b789-4a95-bea0-06a0838c4694@oss.qualcomm.com>
Date: Fri, 7 Nov 2025 10:29:54 +0800
From: Yongxing Mou <yongxing.mou@....qualcomm.com>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: 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>, 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 4:43 PM, Abel Vesa wrote:
> On 25-11-06 15:12:06, 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.
>>
>> Aligned with other x1e80100-based platforms: the PWM signal is controlled
>> by PMK8550, and the backlight enable signal is handled by PMC8380.
>>
>> Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
>> ---
>> Changes in v2:
>> - Add hamoa-iot-evk to the commit subject. [Konrad]
>> - Correct the property order in the vreg_edp_bl node. [Konrad]
>> - Link to v1: https://lore.kernel.org/r/20251028-hamoa_dvt_backlight-v1-1-97ecb8d0ad01@oss.qualcomm.com
>> ---
>>   arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts | 55 ++++++++++++++++++++++++++++++
>>   1 file changed, 55 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts b/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts
>> index 36dd6599402b..454aad40de34 100644
>> --- a/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts
>> +++ b/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts
>> @@ -17,6 +17,16 @@ aliases {
>>   		serial1 = &uart14;
>>   	};
>>   
>> +	backlight: backlight {
>> +		compatible = "pwm-backlight";
>> +		pwms = <&pmk8550_pwm 0 5000000>;
>> +		enable-gpios = <&pmc8380_3_gpios 4 GPIO_ACTIVE_HIGH>;
>> +		power-supply = <&vreg_edp_bl>;
>> +
>> +		pinctrl-0 = <&edp_bl_en>, <&edp_bl_pwm>;
>> +		pinctrl-names = "default";
>> +	};
>> +
>>   	wcd938x: audio-codec {
>>   		compatible = "qcom,wcd9385-codec";
>>   
>> @@ -183,6 +193,22 @@ vreg_edp_3p3: regulator-edp-3p3 {
>>   		regulator-boot-on;
>>   	};
>>   
>> +	vreg_edp_bl: regulator-edp-bl {
>> +		compatible = "regulator-fixed";
>> +
>> +		regulator-name = "VBL9";
>> +		regulator-min-microvolt = <3600000>;
>> +		regulator-max-microvolt = <3600000>;
>> +
>> +		gpio = <&pmc8380_3_gpios 10 GPIO_ACTIVE_HIGH>;
>> +		enable-active-high;
>> +
>> +		pinctrl-0 = <&edp_bl_reg_en>;
>> +		pinctrl-names = "default";
>> +
>> +		regulator-boot-on;
>> +	};
>> +
>>   	vreg_nvme: regulator-nvme {
>>   		compatible = "regulator-fixed";
>>   
>> @@ -819,6 +845,8 @@ &mdss_dp3 {
>>   	aux-bus {
>>   		panel {
>>   			compatible = "edp-panel";
>> +
>> +			backlight = <&backlight>;
>>   			power-supply = <&vreg_edp_3p3>;
>>   
>>   			port {
>> @@ -879,6 +907,22 @@ usb0_1p8_reg_en: usb0-1p8-reg-en-state {
>>   	};
>>   };
>>   
>> +&pmc8380_3_gpios {
>> +	edp_bl_en: edp-bl-en-state {
>> +		pins = "gpio4";
>> +		function = "normal";
>> +		power-source = <1>;
>> +		input-disable;
>> +		output-enable;
>> +	};
>> +
>> +	edp_bl_reg_en: edp-bl-reg-en-state {
>> +		pins = "gpio10";
>> +		function = "normal";
>> +	};
>> +
> 
> Drop empty line.
> 
> With that fixed:
> 
> Reviewed-by: Abel Vesa <abel.vesa@...aro.org>
Thanks, will fix that next patchset.