[PATCH v3] arm64: dts: qcom: hamoa-iot-evk: Add backlight support for eDP panel

[PATCH v3] arm64: dts: qcom: hamoa-iot-evk: Add backlight support for eDP panel

[Yongxing Mou]

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.

Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Yongxing Mou <yongxing.mou@oss.qualcomm.com>
---
Changes in v3:
- Optimize the description of the commit message. [Konrad]
- Drop empty line. [Abel]
- Link to v2: https://lore.kernel.org/r/20251106-hamoa_dvt_backlight-v2-1-9f844c8f8110@oss.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 | 54 ++++++++++++++++++++++++++++++
 1 file changed, 54 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..499db4d67583 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 +907,21 @@ 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";
+	};
+};
+
 &pmc8380_5_gpios {
 	usb0_pwr_1p15_reg_en: usb0-pwr-1p15-reg-en-state {
 		pins = "gpio8";
@@ -890,6 +933,17 @@ usb0_pwr_1p15_reg_en: usb0-pwr-1p15-reg-en-state {
 	};
 };
 
+&pmk8550_gpios {
+	edp_bl_pwm: edp-bl-pwm-state {
+		pins = "gpio5";
+		function = "func3";
+	};
+};
+
+&pmk8550_pwm {
+	status = "okay";
+};
+
 &smb2360_0 {
 	status = "okay";
 };

---
base-commit: f7d2388eeec24966fc4d5cf32d706f0514f29ac5
change-id: 20251028-hamoa_dvt_backlight-373528b7ce7e

Best regards,
-- 
Yongxing Mou <yongxing.mou@oss.qualcomm.com>

Re: [PATCH v3] arm64: dts: qcom: hamoa-iot-evk: Add backlight support for eDP panel

[Konrad Dybcio]

On 11/12/25 5:21 AM, Yongxing Mou wrote:
> 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.
> 
> Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
> Signed-off-by: Yongxing Mou <yongxing.mou@oss.qualcomm.com>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

Konrad

Re: [PATCH v3] arm64: dts: qcom: hamoa-iot-evk: Add backlight support for eDP panel

[Dmitry Baryshkov]

On Wed, Nov 12, 2025 at 12:21:23PM +0800, Yongxing Mou wrote:
> 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.
> 
> Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
> Signed-off-by: Yongxing Mou <yongxing.mou@oss.qualcomm.com>
> ---
> Changes in v3:
> - Optimize the description of the commit message. [Konrad]
> - Drop empty line. [Abel]
> - Link to v2: https://lore.kernel.org/r/20251106-hamoa_dvt_backlight-v2-1-9f844c8f8110@oss.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 | 54 ++++++++++++++++++++++++++++++
>  1 file changed, 54 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>


-- 
With best wishes
Dmitry

Re: [PATCH v3] arm64: dts: qcom: hamoa-iot-evk: Add backlight support for eDP panel

[Yongxing Mou]

On 11/12/2025 12:21 PM, Yongxing Mou wrote:
> 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.
> 
> Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
> Signed-off-by: Yongxing Mou <yongxing.mou@oss.qualcomm.com>
> ---
> Changes in v3:
> - Optimize the description of the commit message. [Konrad]
> - Drop empty line. [Abel]
> - Link to v2: https://lore.kernel.org/r/20251106-hamoa_dvt_backlight-v2-1-9f844c8f8110@oss.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 | 54 ++++++++++++++++++++++++++++++
>   1 file changed, 54 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..499db4d67583 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 +907,21 @@ 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";
> +	};
> +};
> +
>   &pmc8380_5_gpios {
>   	usb0_pwr_1p15_reg_en: usb0-pwr-1p15-reg-en-state {
>   		pins = "gpio8";
> @@ -890,6 +933,17 @@ usb0_pwr_1p15_reg_en: usb0-pwr-1p15-reg-en-state {
>   	};
>   };
>   
> +&pmk8550_gpios {
> +	edp_bl_pwm: edp-bl-pwm-state {
> +		pins = "gpio5";
> +		function = "func3";
> +	};
> +};
> +
> +&pmk8550_pwm {
> +	status = "okay";
> +};
> +
>   &smb2360_0 {
>   	status = "okay";
>   };
> 
> ---
> base-commit: f7d2388eeec24966fc4d5cf32d706f0514f29ac5
> change-id: 20251028-hamoa_dvt_backlight-373528b7ce7e
> 
> Best regards,
Just a friendly reminder, can we pick this change to tree?

Re: [PATCH v3] arm64: dts: qcom: hamoa-iot-evk: Add backlight support for eDP panel

[Bjorn Andersson]

On Wed, 12 Nov 2025 12:21:23 +0800, Yongxing Mou wrote:
> 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.
> 
> [...]

Applied, thanks!

[1/1] arm64: dts: qcom: hamoa-iot-evk: Add backlight support for eDP panel
      commit: 512716f69610d81db958b781132370731c69e874

Best regards,
-- 
Bjorn Andersson <andersson@kernel.org>