[PATCH v2 1/2] arm64: dts: qcom: hamoa-iot-evk: Add eDP display overlay
From: Anand Tiwari
Date: Tue Aug 18 2026 - 05:55:50 EST
Hamoa IoT EVK variants are available with and without an eDP panel.
When the panel is not connected, DP3 is unused, but the base
DTS still describes the eDP panel and display path.
This causes the eDP-panel driver to probe an unavailable panel, resulting
in AUX probe timeouts and missing display modes. Userspace then attempts
display commits through the eDP connector, causing repeated DPU vblank,
frame-done, and IRQ timeout errors.
Move the DP3 and eDP panel specific nodes into an overlay so the base
DTB describes the configuration without the panel, while the overlay
enables eDP panel for boards with the panel connected.
DT overlays cannot remove properties from a node defined in the base
DTB, so keeping the /delete-property/ of #sound-dai-cells in base DTS
where it takes effect.
Signed-off-by: Anand Tiwari <anand.tiwari@xxxxxxxxxxxxxxxx>
---
arch/arm64/boot/dts/qcom/Makefile | 3 +
arch/arm64/boot/dts/qcom/hamoa-iot-evk-edp.dtso | 124 ++++++++++++++++++++++++
arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts | 107 --------------------
3 files changed, 127 insertions(+), 107 deletions(-)
diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
index 1c86e7e98f55..bb0da34983c8 100644
--- a/arch/arm64/boot/dts/qcom/Makefile
+++ b/arch/arm64/boot/dts/qcom/Makefile
@@ -20,6 +20,9 @@ dtb-$(CONFIG_ARCH_QCOM) += glymur-asus-zenbook-a16-ux3607oa.dtb
dtb-$(CONFIG_ARCH_QCOM) += glymur-crd.dtb
dtb-$(CONFIG_ARCH_QCOM) += hamoa-iot-evk.dtb
+hamoa-iot-evk-edp-dtbs := hamoa-iot-evk.dtb hamoa-iot-evk-edp.dtbo
+dtb-$(CONFIG_ARCH_QCOM) += hamoa-iot-evk-edp.dtb
+
hamoa-iot-evk-el2-dtbs := hamoa-iot-evk.dtb x1-el2.dtbo
dtb-$(CONFIG_ARCH_QCOM) += hamoa-iot-evk-el2.dtb
diff --git a/arch/arm64/boot/dts/qcom/hamoa-iot-evk-edp.dtso b/arch/arm64/boot/dts/qcom/hamoa-iot-evk-edp.dtso
new file mode 100644
index 000000000000..0929fc0358eb
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/hamoa-iot-evk-edp.dtso
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+
+&{/} {
+ 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";
+ };
+
+ vreg_edp_3p3: regulator-edp-3p3 {
+ compatible = "regulator-fixed";
+
+ regulator-name = "VREG_EDP_3P3";
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+
+ gpio = <&tlmm 70 GPIO_ACTIVE_HIGH>;
+ enable-active-high;
+
+ pinctrl-0 = <&edp_reg_en>;
+ pinctrl-names = "default";
+
+ 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;
+ };
+};
+
+&mdss_dp3 {
+ pinctrl-0 = <&edp0_hpd_default>;
+ pinctrl-names = "default";
+
+ status = "okay";
+
+ aux-bus {
+ panel {
+ compatible = "edp-panel";
+
+ backlight = <&backlight>;
+ power-supply = <&vreg_edp_3p3>;
+
+ port {
+ edp_panel_in: endpoint {
+ remote-endpoint = <&mdss_dp3_out>;
+ };
+ };
+ };
+ };
+};
+
+&mdss_dp3_out {
+ data-lanes = <0 1 2 3>;
+ link-frequencies = /bits/ 64 <1620000000 2700000000 5400000000 8100000000>;
+
+ remote-endpoint = <&edp_panel_in>;
+};
+
+&mdss_dp3_phy {
+ vdda-phy-supply = <&vreg_l3j_0p8>;
+ vdda-pll-supply = <&vreg_l2j_1p2>;
+
+ status = "okay";
+};
+
+&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";
+ };
+};
+
+&pmk8550_gpios {
+ edp_bl_pwm: edp-bl-pwm-state {
+ pins = "gpio5";
+ function = "func3";
+ };
+};
+
+&pmk8550_pwm {
+ status = "okay";
+};
+
+&tlmm {
+ edp_reg_en: edp-reg-en-state {
+ pins = "gpio70";
+ function = "gpio";
+ drive-strength = <16>;
+ bias-disable;
+ };
+};
diff --git a/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts b/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts
index 9fa86bb6438e..51a3f684585e 100644
--- a/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts
+++ b/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts
@@ -19,16 +19,6 @@ 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";
- };
-
clocks {
mcp2518fd_osc: clock-40000000 {
compatible = "fixed-clock";
@@ -213,38 +203,6 @@ pmic_glink_ss2_con_sbu_in: endpoint {
};
};
- vreg_edp_3p3: regulator-edp-3p3 {
- compatible = "regulator-fixed";
-
- regulator-name = "VREG_EDP_3P3";
- regulator-min-microvolt = <3300000>;
- regulator-max-microvolt = <3300000>;
-
- gpio = <&tlmm 70 GPIO_ACTIVE_HIGH>;
- enable-active-high;
-
- pinctrl-0 = <&edp_reg_en>;
- pinctrl-names = "default";
-
- 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";
@@ -976,40 +934,6 @@ &mdss_dp2_out {
&mdss_dp3 {
/delete-property/ #sound-dai-cells;
-
- pinctrl-0 = <&edp0_hpd_default>;
- pinctrl-names = "default";
-
- status = "okay";
-
- aux-bus {
- panel {
- compatible = "edp-panel";
-
- backlight = <&backlight>;
- power-supply = <&vreg_edp_3p3>;
-
- port {
- edp_panel_in: endpoint {
- remote-endpoint = <&mdss_dp3_out>;
- };
- };
- };
- };
-};
-
-&mdss_dp3_out {
- data-lanes = <0 1 2 3>;
- link-frequencies = /bits/ 64 <1620000000 2700000000 5400000000 8100000000>;
-
- remote-endpoint = <&edp_panel_in>;
-};
-
-&mdss_dp3_phy {
- vdda-phy-supply = <&vreg_l3j_0p8>;
- vdda-pll-supply = <&vreg_l2j_1p2>;
-
- status = "okay";
};
&pcie3_port0 {
@@ -1140,19 +1064,6 @@ led@2 {
};
&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";
- };
-
pm_sde7_aux_3p3_en: pcie-aux-3p3-default-state {
pins = "gpio8";
function = "normal";
@@ -1181,17 +1092,6 @@ 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";
-};
-
&sdhc_2 {
cd-gpios = <&tlmm 71 GPIO_ACTIVE_LOW>;
@@ -1357,13 +1257,6 @@ ec_int_n_default: ec-int-n-state {
bias-disable;
};
- edp_reg_en: edp-reg-en-state {
- pins = "gpio70";
- function = "gpio";
- drive-strength = <16>;
- bias-disable;
- };
-
eusb3_reset_n: eusb3-reset-n-state {
pins = "gpio6";
function = "gpio";
--
2.54.0